TWI739353B - Secondary printing screen structure for printing solar cells, manufacturing method and printing method - Google Patents

Abstract

A secondary printing screen structure for printing solar cells includes: a first printing screen, including: a first screen frame; a first screen cloth stretched and fixed on the first screen frame, and The first mesh fabric includes a first squeegee surface and a first printing surface; a first polymer material layer covering the first mesh fabric, and the first polymer material layer includes a plurality of finger electrode patterns Wherein, the left and/or right side of each of the finger electrode patterns includes a plurality of recesses on one side of the first printing surface, and the recesses are located on the left side of each of the finger electrode patterns And/or on the right side; wherein, the first mesh includes a plurality of reserved portions, and the reserved portions are in contact with a plurality of monolithic electrodes on an object to be printed.

Description

Secondary printing screen structure for printing solar cells, manufacturing method and printing method

The present invention relates to a printing screen used for printing solar cells, a method for manufacturing a printing screen, and a printing method using a printing screen, and particularly refers to a secondary printing screen structure and manufacturing method used for secondary printing of solar cells And printing method.

In the prior art, the structure of solar cells usually includes finger lines and bus bars, and most solar cell designs use very fine "finger lines". The photoelectrons collected in the effective area are transferred to the larger "monolithic electrode", and then transferred to the circuit system of the component. In order to increase the efficiency of the solar cell, the finger electrode should be thin and tall in design, so that the height and width in the solar cell structure are better, and the energy conversion efficiency is high. In the prior art, the finger electrodes are perpendicular to the monolithic electrode and are distributed on the silicon wafer (wafer) in an equidistant manner. With the improvement of the meshing technology, the finger electrodes are becoming thinner and thinner.

In the prior art, two types of electrodes of solar cells are mainly produced by secondary printing technology. The meaning of secondary printing is to print a monolithic electrode (Bus bar) on the object to be printed with one printing, and then Then, a second printing is used to print finger lines on the object to be printed with the bus bar, so that two types of solar cell electrodes can be formed on the object to be printed.

Figure 1a is a schematic diagram to illustrate the printing screen structure used for one-time printing in the conventional technology; Figure 1b is a schematic diagram to illustrate the printing screen structure used for secondary printing in the conventional technology; Figure 1c is A schematic diagram is used to illustrate a part of the structure of the object to be printed in the conventional technology; FIG. 1d is a schematic side view to illustrate a part of the structure of the object to be printed in the conventional technology after being printed. Please refer to Figure 1a to Figure 1d. Figure 1a shows a one-time printing screen 10 used to make a monolithic electrode (Bus bar). The one-time printing screen 10 mainly includes a mesh 101 coated with an emulsion layer and formed by exposure and development. The bus bar pattern 103 on the mesh cloth 101, in the prior art, will first use the one-time printing screen 10 to form the bus bar electrode 1031 on the object to be printed 14. As shown in Figure 1c and Figure 1d. Figure 1b shows the secondary printing screen 12 used to make finger lines. The printing screen 12 mainly includes a mesh 121 coated with an emulsion layer and a finger line pattern 123 formed on the mesh 121 by exposure and development. In the prior art, after the bus bar electrode 1031 is formed on the object to be printed 14, the secondary printing screen 12 is used to form finger line electrodes on the object to be printed 14. ) Electrode 1231, and the finger line electrode 1231 will be connected across the bus bar electrode 1031, so that the finger line electrode 1231 is connected to the bus bar electrode 1031. ) The electrodes 1031 are in contact with each other to conduct electricity, as shown in Fig. 1c and Fig. 1d.

However, in the above-mentioned conventional technology, when the entire bus bar electrode 1031 is printed on the object to be printed 14 and the finger line electrode 1231 is to be printed, the second printing of the screen 12 is easy. It collides with the bus bar electrode 1031 on the object to be printed 14, so that the original bus bar electrode 1031 will be scratched. Furthermore, because the finger line electrode 1231 is connected across the bus bar electrode 1031, the finger line electrode 1231 and the bus bar electrode 1231 There may be gaps between the electrodes 1031, resulting in poor contact between the bus bar electrode 1031 and the finger line electrode 1231 at the bridge, or there is too much contact between the two electrodes. The high and low fluctuations of the solar cell will affect the power generation efficiency of the solar cell.

Based on the above reasons, how to provide a brand-new printing screen for printing solar cells, a method for manufacturing a printing screen, and a printing method using a printing screen, so that the solar electrode produced by secondary printing has better power generation efficiency, It is a problem to be solved.

To achieve the foregoing objective, the present invention provides a secondary printing screen structure for printing solar cells, including: a first printing screen, including: a first screen frame; a first screen, stretched and fixed On the first screen frame, and the first mesh includes a first scraper surface and a first printing surface; a first polymer material layer covering the first mesh, and the first polymer material The layer includes a plurality of finger-shaped electrode patterns; wherein the left and/or right side of each of the finger-shaped electrode patterns includes a plurality of recesses on one side of the first printing surface, and the recesses are located in the fingers. On the left and/or right side of each of the shaped electrode patterns; wherein the first mesh includes a plurality of reserved portions, and the reserved portions are in contact with a plurality of monolithic electrodes on an object to be printed .

Furthermore, the secondary printing screen structure of the present invention further includes: a second printing screen, including: a second screen frame; a second screen cloth, stretched and fixed on the second screen frame, and The second mesh includes a second scraper surface and a second printing surface; a second polymer material layer, The second mesh cloth is covered, and the second polymer material layer includes a plurality of monolithic electrode patterns; wherein, each of the monolithic electrode patterns includes a plurality of electrode patterns on one side of the second printing surface The convex parts are located on the left and right sides of each of the monolithic electrode patterns.

Preferably, each of the monolithic electrode patterns includes a first height, and each of the protrusions includes a second height, and the second height is 5-30 μm.

Preferably, each of the finger-shaped electrode patterns includes a first length, and each of the recesses includes a second length, and the second length is 1/3- of the width of the monolithic electrodes. Any value in the range of 1/10.

On the other hand, the present invention also provides a method for manufacturing a secondary printing screen structure for printing solar cells, which includes the following steps: coating on a first mesh of a first printing screen and forming a first A polymer material layer, wherein the first mesh includes a first squeegee surface and a first printing surface; an etching process is used to form the first polymer material layer on one side of the first printing surface A plurality of finger-shaped electrode patterns; and on the side of the first polymer material layer located on the first printing surface, the etching process is used to place each of the finger-shaped electrode patterns on the left side and/or A plurality of recesses are formed on the right side.

Furthermore, the manufacturing method of the secondary printing screen structure of the present invention further includes the following steps: coating and forming a second polymer material layer on a second mesh of a second printing screen, wherein the second The mesh fabric includes a second squeegee surface and a second printing surface; a plurality of monolithic electrode patterns are formed on the second polymer material layer by the etching process; and the second polymer material layer is located on the On one side of the second printing surface, a plurality of protrusions are formed on the left and right sides of each of the monolithic electrode patterns through the etching process.

Preferably, each of the monolithic electrode patterns includes a first height, and each of the protrusions includes a second height, and the second height is 5-30 μm.

Preferably, each of the finger-shaped electrode patterns includes a first length, and each of the recesses includes a second length, and the second length is 1/3-1 of the width of a monolithic electrode Any value in the range of /10.

Preferably, the etching process is a laser etching process.

In addition, the present invention provides a secondary printing method using the secondary printing screen structure of the present invention. Chip electrodes; and aligning the whole chip electrodes by the reserved parts Electrode, and make the paste pass through the finger-shaped electrode patterns and the recesses to form a plurality of finger-shaped electrodes on the object to be printed, wherein each of the finger-shaped electrodes is cut by half The left side and/or the half-cut right side are combined to the monolithic electrodes.

Preferably, the left side of the half-cut and/or the right side of the half-cut of each of the finger electrodes has a height, and the height is any value in the range of 5 μm-30 μm.

10: One printing screen

12: Secondary printing screen

14: Things to be printed

101, 121: Mesh

103: monolithic electrode (Bus bar) pattern

1031: Monolithic electrode (Bus bar) electrode

123: Finger line pattern

1231: Finger line electrode

20: The first printing screen

22: The second printing screen

201: The first screen frame

203: The first mesh

205: The first polymer material layer

207: Finger electrode pattern

209: Part

2071: recess

221: second screen frame

223: second mesh

225: The second polymer material layer

227: monolithic electrode pattern

229: Convex

60: monolithic electrode

601: Electrode recess

70: Finger electrode

701: left/right

S10: The first scraper surface

S12: The first printing surface

S20: The second scraper surface

S22: The second printing surface

H1: first height

H2: second height

H3: third height

H4: Fourth height

H5, H7: height

H6: depth

L1: first length

L2: second length

W1: Width of the whole piece electrode

L4: fourth length

S101-S111: steps

S201-S203: steps

Those with ordinary knowledge in the art can have a better understanding of the various aspects of the present invention and its specific features and advantages after reading the detailed description below with reference to the accompanying drawings. The accompanying drawings include: Figure 1a is an illustration A schematic diagram of the printing screen structure used for one-time printing in the conventional technology; Figure 1b is a schematic diagram illustrating the printing screen structure used for secondary printing in the conventional technology; Figure 1c is a schematic diagram illustrating the printing of the object to be printed in the conventional technology Figure 1d is a schematic side view illustrating a part of the structure of the object to be printed after printing in the prior art; Figure 2a is a schematic diagram illustrating a printing screen structure for secondary printing according to an embodiment of the present invention Fig. 2b is a schematic diagram illustrating the structure of a printing screen for one-time printing according to another embodiment of the present invention; Fig. 3a is a schematic diagram showing the AA cross-sectional structure in Fig. 2a and the relationship with the object to be printed; Fig. 3b is a diagram 2b is a schematic diagram of the AA cross-sectional structure; FIG. 4 is a flowchart illustrating a method for manufacturing a secondary printing screen structure for printing solar cells according to another embodiment of the present invention; FIG. 5 is a flowchart illustrating another embodiment of the present invention A flowchart of a method for manufacturing a secondary printing screen structure of a printed solar cell; FIG. 6 is a flowchart illustrating another embodiment of the present invention, a flow chart of a secondary printing method using the secondary printing screen structure of the present invention; FIG. 7a is an illustration Fig. 7b is a schematic diagram illustrating the partial structure of the object to be printed after being printed by the printing screen structure of an embodiment of the present invention; Fig. 8a is an illustration A schematic diagram of a part of the structure of the object to be printed after being printed by the printing screen structure of another embodiment of the present invention; and FIG. 8b is a schematic side view illustrating a part of the structure of the printing screen structure of another embodiment of the present invention after printing the object to be printed.

The following describes the implementation of the present invention in more detail with the drawings and component symbols, so that those who are familiar with the art can implement it after studying this specification.

Figure 2a is a schematic diagram to illustrate a printing screen structure for secondary printing according to an embodiment of the present invention; Figure 3a is a schematic diagram to illustrate the AA cross-sectional structure in Figure 2a and increase between the printed object relation. 2a and 3a, in an embodiment of the present invention, the secondary printing screen structure for printing solar cells includes a first printing screen 20. It should be understood that, in an embodiment of the present invention, the conventional printing screen structure is used to print the whole-piece electrode pattern, and then the first printing screen 20 of the present invention is used to print the finger electrodes.

The first printing screen 20 includes a first screen frame 201, a first mesh 203 and a first polymer material layer 205. The first mesh cloth 203 is stretched and fixed on the first mesh frame 201, and the first mesh cloth 203 includes a first squeegee surface S10 and a first printing surface S12. The first polymer material layer 205 covers the first mesh Cloth 203, and the second polymer material layer 205 includes a plurality of finger-shaped electrode patterns 207, wherein the left and/or right side of the finger-shaped electrode pattern 207 includes a plurality of recesses 2071 on one side of the first printing surface S12 , The recess 2071 is located on the left and/or right side of the finger electrode pattern 207. In addition, the first mesh 203 will reserve a portion 209 that is in contact with a plurality of monolithic electrodes on a to-be-printed object.

On the other hand, it can be seen from FIG. 2a that not every finger electrode pattern 207 is in contact with the portion 209 on the left and right sides, for example, the finger electrode pattern 207 on the right side of the first printing screen 20 The finger-shaped electrode pattern 207 on the left side of the first printing screen 20 is in contact with the monolithic electrode pattern 207 by its left side, and the finger-shaped electrode pattern 207 is positioned on the The finger-shaped electrode pattern 207 in the middle on the first printing screen 20 is in contact with the monolithic electrode pattern 207 through its left and right sides at the same time. Therefore, the finger electrode pattern 207 includes a recess 2071 on the left side and/or the right side.

Furthermore, FIG. 3a also shows the object to be printed 14 and the monolithic electrode 60 printed on the object to be printed 14. The monolithic electrode 60 has a monolithic electrode width W1. During printing, the monolithic electrode 60 will be embedded in the part 209, so that the finger electrode can be directly printed on the monolithic electrode 60. In addition, the finger type Each of the electrode patterns 207 includes a first length L1 and a first height H1. The concave portion 2071 includes a second length L2 and a second height H2. The second length L2 may be 1/3 of the width W1 of the entire chip electrode. Any value in the range of -1/10, in other words, the finger electrode can be in contact with the monolithic electrode 60 through the protruding part of the second length L2. It should be understood that although the few finger electrode patterns 207 shown in FIG. 2a have different lengths, such as the finger electrode patterns 207 located at the four corners of the second mesh cloth 203, in the present invention, Most of the finger electrode patterns 207 are mainly described.

Fig. 7a is a schematic diagram for illustrating a part of the structure of the printing screen structure of an embodiment of the present invention; Part of the structure after printing. Please refer to Figures 2a, 3a, 7a and 7b. In an embodiment of the present invention, when a printing screen of the prior art is used to print on the to-be-printed 14, it will be formed on the to-be-printed 14 The chip electrode 60. After the monolithic electrode 60 is printed on the object to be printed 14, the first printing screen 20 according to an embodiment of the present invention will be used to print on the object to be printed 14, and the part 209 will be aligned with the monolithic electrode. The electrode 60 forms a finger-shaped electrode 70 on the object to be printed 14, and the finger-shaped electrode 70 is tightly combined with the monolithic electrode 60 through the half-cut left side 701 or the half-cut right side 701. In this way, when the first printing screen 20 is used for printing, the finger electrode 70 can be directly bonded to the monolithic electrode 60, and there is no easy gap between the finger electrode 70 and the monolithic electrode 60. , Thereby increasing the conductivity, and making the monolithic electrode 60 and the finger electrode 70 have a better contact effect, and the height fluctuation between the two electrodes will not be too large, thereby improving the power generation of the solar cell efficient.

On the other hand, in another embodiment of the present invention, the structure of the printing screen used for printing the monolithic electrode can be improved. Fig. 2b is a schematic diagram for explaining the printing screen structure for one-time printing according to another embodiment of the present invention; Fig. 3b is a schematic diagram for explaining the A-A cross-sectional structure in Fig. 2b. 2b and 3b, in another embodiment of this creation, the secondary printing screen structure for printing solar cells further includes a second printing screen 22, and the second printing screen 22 includes a second screen. The frame 221, a second mesh 223 and a second polymer material layer 225. The second mesh cloth 223 is stretched and fixed on the second mesh frame 221, and the second mesh cloth 223 includes a second scraper surface S20 and a second printing surface S22. The second polymer material layer 225 covers the second mesh The second polymer material layer 225 includes a plurality of monolithic electrode patterns 227, wherein the monolithic electrode pattern 227 includes a plurality of protrusions 229 on one side of the second printing surface S22, and the protrusions 229 are located On the left and right sides of the monolithic electrode pattern 227.

Furthermore, the monolithic electrode pattern 227 includes a third height H3 and a monolithic electrode width W1, and the convex portion 229 includes a fourth height H4 and a fourth length L4. In another embodiment of the present invention, the first The four height H4 can be any value in the range of 5-30 μm, and the fourth length L4 can be any value in the range of 1/3-1/10 of the width W1 of the whole chip electrode.

It should be understood that in the above-mentioned embodiments of the present invention, the first mesh 203 and the second mesh 223 may both be meshes of a single material, and in other embodiments of the present invention, the first mesh 203 and the second mesh The two mesh cloths 223 can each be a composite mesh cloth, which means that the first mesh cloth 203 and the second mesh cloth 223 can be composed of two kinds of materials respectively, for example, the first mesh cloth 203 includes a Tetoron material and a metal mesh. The material, and the finger-shaped electrode pattern 207 and the monolithic electrode pattern 227 are formed on the metal mesh material.

Fig. 8a is a schematic diagram for illustrating a part of the structure after printing the printing screen structure of another embodiment of the present invention; Fig. 8b is a schematic side view to illustrate the printing of the object to be printed by another embodiment of the present invention Part of the screen structure after printing. 2a to 3b, 8a and 8b, in another embodiment of the present invention, when the second printing screen 22 is used to print on the to-be-printed material 14, it will form a whole on the to-be-printed material 14 The chip electrode 60 has an electrode recess 601 formed on the left and right sides of the whole chip electrode 60 respectively. After the monolithic electrode 60 is printed on the object to be printed 14, the first printing screen 20 will be used and printed on the object to be printed 14 to form the finger electrode 70 on the object to be printed 14, and The finger electrode 70 can be fitted to the electrode recess 601 of the monolithic electrode 60. In this way, when the first printing screen 20 is used for printing, the finger electrode 70 can be directly fitted into the electrode recess 601 and is less likely to collide with the monolithic electrode 60, and the monolithic electrode 60 can be The finger electrode 70 has a better contact effect, and the height fluctuation between the two electrodes will not be too large, thereby further improving the power generation efficiency of the solar cell.

FIG. 4 is a flowchart for explaining a method for manufacturing a secondary printing screen structure for printing solar cells according to another embodiment of the present invention. 2a, 3a and 4, the manufacturing method of the secondary printing screen structure for printing solar cells of the present invention includes steps S101-step S105, and step S101 is: on a first printing screen 20 A first polymer material layer 205 is coated and formed on a mesh cloth 203. The first mesh cloth 203 includes a first squeegee surface S10 and a first printing surface S12; step S103 is: The first polymer material layer 205 is located on one side of the first printing surface S12 to form a plurality of finger-shaped electrode patterns 207; and step S105 It is: on the side of the first polymer material layer 205 located on the first printing surface S12, a plurality of recesses 2071 are formed on the left and/or right sides of each of the finger electrode patterns 207 through the etching process.

On the other hand, each of the finger electrode patterns 207 includes a first length L1 and a first height H1, the recess 2071 includes a second length L2 and a second height H2, and the second length L2 may be a monolithic piece. Any value in the range of 1/3 to 1/10 of the electrode width W1. In addition, the etching process is a laser etching process.

Furthermore, FIG. 5 is a flowchart for explaining a method for manufacturing a secondary printing screen structure for printing solar cells according to another embodiment of the present invention. Referring to FIGS. 2b, 3b and 5, in another embodiment of the present invention, the method for manufacturing a secondary printing screen structure for printing solar cells further includes step S107-step S111. Step S107 is to coat and form a second polymer material layer 225 on a second mesh 223 of a second printing screen 22, wherein the second mesh 223 includes a second squeegee surface S20 and a first Two printing surfaces S22; Step S109 is: forming a plurality of monolithic electrode patterns 227 on the second polymer material layer 225 by the etching process; and Step S111 is: the second polymer material layer 225 is located at the second On one side of the printing surface S22, a plurality of protrusions 229 are formed on the left and right sides of each of the monolithic electrode patterns 227 through the etching process.

On the other hand, the monolithic electrode pattern 227 includes a third height H3 and a monolithic electrode width W1, and the convex portion 229 includes a fourth height H4 and a fourth length L4. In another embodiment of the present invention, The fourth height H4 can be any value in the range of 5-30 μm, and the fourth length L4 can be any value in the range of 1/3-1/10 of the width W1 of the monolithic electrode.

It can be seen from the above-mentioned manufacturing method that in the present invention, the convex portion 229 and the concave portion 2071 of various specifications can be manufactured by a laser etching process.

FIG. 6 is a flowchart for explaining a secondary printing method using the secondary printing screen structure of the present invention according to another embodiment of the present invention. 2a to 7b, the secondary printing method of another embodiment of the present invention includes step S201 and step S203. Step S201 is: the paste passes through the whole piece of electrode pattern and forms a plurality of patterns on a to-be-printed 14 Monolithic electrode 60; and step S203 is: aligning the monolithic electrode 60 with the reserved portion 209, and allowing the paste to pass through the finger electrode pattern 207 and the recess 2071 to form a plurality on the object to be printed 14. A finger electrode 70, wherein the finger electrode 227 is joined to the monolithic electrode 60 by a half-cut left side 701 and/or a half-cut right side 701. It should be understood that the left side 701 of the half-cut and/or the right side 701 of the half-cut are generated by the slurry passing through the recess 2071.

Furthermore, in another embodiment of the present invention, the printing screen structure shown in FIG. 2b and FIG. 3b can also be used to print the whole-piece electrode. For example, referring to Figure 2b, Figure 3b, Figure 8a and Figure 8b, in the printing method of another embodiment of the present invention, the paste can pass through the monolithic electrode pattern 227 and the convex portion 229 and be printed on a to-be-printed A plurality of monolithic electrodes 60 are formed on the object 14. Wherein, the left and right sides of each monolithic electrode 60 respectively include an electrode recess 601; in addition, the finger electrode 227 can be further fitted into the monolithic electrode by half-cutting the left side 701 and/or half-cutting the right side 701 60 on the electrode recess 601.

On the other hand, referring to FIGS. 7a and 7b again, among the electrodes printed on the object to be printed 14 through the first printing screen 20 and the second printing screen 22, the monolithic electrode 60 includes a height H5 . The half-cut left side 701 and/or the half-cut right side 701 of the finger electrode 70 respectively have a height H7, and the height H7 can be any value in the range of 5 μm-30 μm. In addition, in the electrode structure shown in FIGS. 8a and 8b, the electrode recess 601 of the monolithic electrode 60 includes a depth H6, and the depth H6 is any value in the range of 5 μm-30 μm.

In summary, the present invention successfully provides a secondary printing screen structure, manufacturing method and printing method for printing solar cells. In the secondary printing screen structure for printing solar cells and the manufacturing method thereof of the present invention, a finger-shaped electrode pattern including concave portions can be provided, and a monolithic electrode pattern including convex portions can be further provided. On the other hand, the present invention also provides a secondary printing method using a secondary printing screen structure. With reference to FIGS. 1d and 7b, it can be clearly seen that, compared with the prior art, the secondary printing screen structure of the present invention The height fluctuations between the printed two types of solar electrodes will not be too large, and the monolithic electrode 60 and the finger electrode 70 can have a better contact effect, thereby improving the power generation efficiency of the solar cell.

The above descriptions are only used to explain the preferred embodiments of the present invention, and are not intended to restrict the present invention in any form. Therefore, any modification or change related to the present invention is made under the same spirit of the invention. , Should still be included in the scope of the present invention's intended protection.

201: The first screen frame

205: The first polymer material layer

207: Finger electrode pattern

2071: recess

H1: first height

H2: second height

L1: first length

L2: second length

W1: Width of the whole piece electrode

S10: The first scraper surface

S12: The first printing surface

Claims (11)

A secondary printing screen structure for printing solar cells, comprising: a first printing screen, including: a first screen frame; a first screen cloth, stretched and fixed on the first screen frame, and The first mesh includes a first squeegee surface and a first printing surface; a first polymer material layer covering the first mesh, and the first polymer material layer includes a plurality of finger electrode patterns ; Wherein, the left side and/or right side of each of the finger-like electrode patterns include a plurality of recesses on one side of the first printing surface, and the recesses are located on the left side of each of the finger-like electrode patterns And/or on the right side; wherein, the first mesh includes a plurality of reserved portions, and the reserved portions are in contact with a plurality of monolithic electrodes on an object to be printed. The secondary printing screen structure according to item 1 of the scope of patent application, further includes: a second printing screen, including: a second screen frame; a second mesh, stretched and fixed to the second screen On the frame, and the second mesh includes a second squeegee surface and a second printing surface; a second polymer material layer covering the second mesh, and the second polymer material layer includes a plurality of integral Chip electrode patterns; wherein, each of the one-piece electrode patterns includes a plurality of convex portions on one side of the second printing surface, and the convex portions are located on the left and right sides of each of the one-piece electrode patterns On both sides. According to the second-printing screen structure described in item 2 of the patent application, each of the one-piece electrode patterns includes a first height, each of the convex portions includes a second height, and the first The second height is 5~30μm. According to the second-printing screen structure described in claim 1, wherein each of the finger-shaped electrode patterns includes a first length, each of the recesses includes a second length, and the second The length is any value in the range of 1/3-1/10 of the width of the monolithic electrodes. A method for manufacturing a secondary printing screen structure for printing solar cells includes the following steps: coating and forming a first polymer material layer on a first mesh of a first printing screen, wherein the The first mesh includes a first squeegee surface and a first printing surface; an etching process is used to form a plurality of finger electrode patterns on the side of the first polymer material layer on the first printing surface; And on the side of the first polymer material layer on the first printing surface, a plurality of recesses are formed on the left side and/or right side of each of the finger electrode patterns through the etching process. The method for fabricating a secondary printing screen structure according to item 5 of the scope of patent application further includes the following steps: coating and forming a second polymer material layer on a second mesh of a second printing screen; Wherein, the second mesh includes a second squeegee surface and a second printing surface; a plurality of monolithic electrode patterns are formed on the second polymer material layer by the etching process; and on the second height The molecular material layer is located on one side of the second printing surface, and a plurality of protrusions are formed on the left and right sides of each of the monolithic electrode patterns through the etching process. According to the method for manufacturing a secondary printing screen structure according to item 6 of the scope of patent application, wherein each of the one-piece electrode patterns includes a first height, and each of the protrusions includes a second height, The second height is 5-30 μm. According to the method for manufacturing a secondary printing screen structure according to item 5 of the scope of patent application, each of the finger electrode patterns includes a first length, each of the recesses includes a second length, and The second length is any value in the range of 1/3-1/10 of the width of the one-piece electrode. According to the manufacturing method of the secondary printing screen structure according to item 5 of the scope of patent application, the etching process is a laser etching process. A secondary printing method using the secondary printing screen structure described in item 1 of the scope of patent application includes the following steps: the paste passes through a plurality of monolithic electrode patterns and forms a plurality of squares on an object to be printed Chip electrodes; and aligning the monolithic electrodes with the reserved parts, and passing the paste through the finger electrode patterns and the recesses to form a plurality of fingers on the object to be printed Shaped electrodes, wherein each of the finger-shaped electrodes is joined to the monolithic electrodes by the left side of the half-cut and/or the right side of the half-cut. According to the second printing method of the second printing screen structure according to item 10 of the scope of patent application, the left side of the half-cut and/or the right side of the half-cut of each of the finger-shaped electrodes has a height, and The height is any value in the range of 5μm-30μm.

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