TWI604605B - 半導體裝置及其製造方法 - Google Patents
半導體裝置及其製造方法 Download PDFInfo
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- TWI604605B TWI604605B TW105141643A TW105141643A TWI604605B TW I604605 B TWI604605 B TW I604605B TW 105141643 A TW105141643 A TW 105141643A TW 105141643 A TW105141643 A TW 105141643A TW I604605 B TWI604605 B TW I604605B
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- Prior art keywords
- layer
- ferroelectric material
- recess
- semiconductor device
- barrier layer
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Links
- 239000004065 semiconductor Substances 0.000 title claims description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000000463 material Substances 0.000 claims description 65
- 230000004888 barrier function Effects 0.000 claims description 48
- 239000000758 substrate Substances 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 24
- 238000005229 chemical vapour deposition Methods 0.000 claims description 6
- 238000000231 atomic layer deposition Methods 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 125000002524 organometallic group Chemical group 0.000 claims description 3
- 238000005240 physical vapour deposition Methods 0.000 claims description 3
- 238000004544 sputter deposition Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 230000010287 polarization Effects 0.000 description 15
- 230000008569 process Effects 0.000 description 12
- 239000002131 composite material Substances 0.000 description 11
- 229910002601 GaN Inorganic materials 0.000 description 9
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 6
- 238000002161 passivation Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005530 etching Methods 0.000 description 5
- 230000005533 two-dimensional electron gas Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- RNQKDQAVIXDKAG-UHFFFAOYSA-N aluminum gallium Chemical compound [Al].[Ga] RNQKDQAVIXDKAG-UHFFFAOYSA-N 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000002019 doping agent Substances 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- OQPDWFJSZHWILH-UHFFFAOYSA-N [Al].[Al].[Al].[Ti] Chemical compound [Al].[Al].[Al].[Ti] OQPDWFJSZHWILH-UHFFFAOYSA-N 0.000 description 2
- AJGDITRVXRPLBY-UHFFFAOYSA-N aluminum indium Chemical compound [Al].[In] AJGDITRVXRPLBY-UHFFFAOYSA-N 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001195 gallium oxide Inorganic materials 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 229910003468 tantalcarbide Inorganic materials 0.000 description 2
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910021324 titanium aluminide Inorganic materials 0.000 description 2
- ITWBWJFEJCHKSN-UHFFFAOYSA-N 1,4,7-triazonane Chemical compound C1CNCCNCCN1 ITWBWJFEJCHKSN-UHFFFAOYSA-N 0.000 description 1
- NZIHMSYSZRFUQJ-UHFFFAOYSA-N 6-chloro-1h-benzimidazole-2-carboxylic acid Chemical compound C1=C(Cl)C=C2NC(C(=O)O)=NC2=C1 NZIHMSYSZRFUQJ-UHFFFAOYSA-N 0.000 description 1
- 229910017109 AlON Inorganic materials 0.000 description 1
- 229910000980 Aluminium gallium arsenide Inorganic materials 0.000 description 1
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910004143 HfON Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910005487 Ni2Si Inorganic materials 0.000 description 1
- 239000004341 Octafluorocyclobutane Substances 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- 229910018503 SF6 Inorganic materials 0.000 description 1
- 229910004541 SiN Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910004200 TaSiN Inorganic materials 0.000 description 1
- DUMHRFXBHXIRTD-UHFFFAOYSA-N Tantalum carbide Chemical compound [Ta+]#[C-] DUMHRFXBHXIRTD-UHFFFAOYSA-N 0.000 description 1
- 229910010037 TiAlN Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- GPBUGPUPKAGMDK-UHFFFAOYSA-N azanylidynemolybdenum Chemical compound [Mo]#N GPBUGPUPKAGMDK-UHFFFAOYSA-N 0.000 description 1
- IVHJCRXBQPGLOV-UHFFFAOYSA-N azanylidynetungsten Chemical compound [W]#N IVHJCRXBQPGLOV-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- HPQRSQFZILKRDH-UHFFFAOYSA-M chloro(trimethyl)plumbane Chemical compound C[Pb](C)(C)Cl HPQRSQFZILKRDH-UHFFFAOYSA-M 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- IAOQICOCWPKKMH-UHFFFAOYSA-N dithieno[3,2-a:3',2'-d]thiophene Chemical compound C1=CSC2=C1C(C=CS1)=C1S2 IAOQICOCWPKKMH-UHFFFAOYSA-N 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- HZXMRANICFIONG-UHFFFAOYSA-N gallium phosphide Chemical compound [Ga]#P HZXMRANICFIONG-UHFFFAOYSA-N 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- BCCOBQSFUDVTJQ-UHFFFAOYSA-N octafluorocyclobutane Chemical compound FC1(F)C(F)(F)C(F)(F)C1(F)F BCCOBQSFUDVTJQ-UHFFFAOYSA-N 0.000 description 1
- 235000019407 octafluorocyclobutane Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- XSOKHXFFCGXDJZ-UHFFFAOYSA-N telluride(2-) Chemical compound [Te-2] XSOKHXFFCGXDJZ-UHFFFAOYSA-N 0.000 description 1
- HBBBDGWCSBWWKP-UHFFFAOYSA-J tetrachloroantimony Chemical compound Cl[Sb](Cl)(Cl)Cl HBBBDGWCSBWWKP-UHFFFAOYSA-J 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- ZVWKZXLXHLZXLS-UHFFFAOYSA-N zirconium nitride Chemical compound [Zr]#N ZVWKZXLXHLZXLS-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/40—FETs having zero-dimensional [0D], one-dimensional [1D] or two-dimensional [2D] charge carrier gas channels
- H10D30/47—FETs having zero-dimensional [0D], one-dimensional [1D] or two-dimensional [2D] charge carrier gas channels having 2D charge carrier gas channels, e.g. nanoribbon FETs or high electron mobility transistors [HEMT]
- H10D30/471—High electron mobility transistors [HEMT] or high hole mobility transistors [HHMT]
- H10D30/475—High electron mobility transistors [HEMT] or high hole mobility transistors [HHMT] having wider bandgap layer formed on top of lower bandgap active layer, e.g. undoped barrier HEMTs such as i-AlGaN/GaN HEMTs
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- H10D30/40—FETs having zero-dimensional [0D], one-dimensional [1D] or two-dimensional [2D] charge carrier gas channels
- H10D30/47—FETs having zero-dimensional [0D], one-dimensional [1D] or two-dimensional [2D] charge carrier gas channels having 2D charge carrier gas channels, e.g. nanoribbon FETs or high electron mobility transistors [HEMT]
- H10D30/471—High electron mobility transistors [HEMT] or high hole mobility transistors [HHMT]
- H10D30/472—High electron mobility transistors [HEMT] or high hole mobility transistors [HHMT] having lower bandgap active layer formed on top of wider bandgap layer, e.g. inverted HEMT
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- H10D30/40—FETs having zero-dimensional [0D], one-dimensional [1D] or two-dimensional [2D] charge carrier gas channels
- H10D30/47—FETs having zero-dimensional [0D], one-dimensional [1D] or two-dimensional [2D] charge carrier gas channels having 2D charge carrier gas channels, e.g. nanoribbon FETs or high electron mobility transistors [HEMT]
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- H10D30/0415—Manufacture or treatment of FETs having insulated gates [IGFET] of FETs having ferroelectric gate insulators
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- H10D30/69—IGFETs having charge trapping gate insulators, e.g. MNOS transistors
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- H10D30/69—IGFETs having charge trapping gate insulators, e.g. MNOS transistors
- H10D30/694—IGFETs having charge trapping gate insulators, e.g. MNOS transistors characterised by the shapes, relative sizes or dispositions of the gate electrodes
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- H10D30/694—IGFETs having charge trapping gate insulators, e.g. MNOS transistors characterised by the shapes, relative sizes or dispositions of the gate electrodes
- H10D30/699—IGFETs having charge trapping gate insulators, e.g. MNOS transistors characterised by the shapes, relative sizes or dispositions of the gate electrodes having the gate at least partly formed in a trench
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- H10D62/10—Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
- H10D62/124—Shapes, relative sizes or dispositions of the regions of semiconductor bodies or of junctions between the regions
- H10D62/126—Top-view geometrical layouts of the regions or the junctions
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- H10D64/60—Electrodes characterised by their materials
- H10D64/66—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes
- H10D64/68—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes characterised by the insulator, e.g. by the gate insulator
- H10D64/681—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes characterised by the insulator, e.g. by the gate insulator having a compositional variation, e.g. multilayered
- H10D64/685—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes characterised by the insulator, e.g. by the gate insulator having a compositional variation, e.g. multilayered being perpendicular to the channel plane
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- H10D64/60—Electrodes characterised by their materials
- H10D64/66—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes
- H10D64/68—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes characterised by the insulator, e.g. by the gate insulator
- H10D64/689—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes characterised by the insulator, e.g. by the gate insulator having ferroelectric layers
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- H10D62/80—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials
- H10D62/82—Heterojunctions
- H10D62/824—Heterojunctions comprising only Group III-V materials heterojunctions, e.g. GaN/AlGaN heterojunctions
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- H10D62/80—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials
- H10D62/85—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials being Group III-V materials, e.g. GaAs
- H10D62/8503—Nitride Group III-V materials, e.g. AlN or GaN
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- H10D64/00—Electrodes of devices having potential barriers
- H10D64/20—Electrodes characterised by their shapes, relative sizes or dispositions
- H10D64/27—Electrodes not carrying the current to be rectified, amplified, oscillated or switched, e.g. gates
- H10D64/311—Gate electrodes for field-effect devices
- H10D64/411—Gate electrodes for field-effect devices for FETs
- H10D64/511—Gate electrodes for field-effect devices for FETs for IGFETs
- H10D64/512—Disposition of the gate electrodes, e.g. buried gates
- H10D64/513—Disposition of the gate electrodes, e.g. buried gates within recesses in the substrate, e.g. trench gates, groove gates or buried gates
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- H10D64/20—Electrodes characterised by their shapes, relative sizes or dispositions
- H10D64/27—Electrodes not carrying the current to be rectified, amplified, oscillated or switched, e.g. gates
- H10D64/311—Gate electrodes for field-effect devices
- H10D64/411—Gate electrodes for field-effect devices for FETs
- H10D64/511—Gate electrodes for field-effect devices for FETs for IGFETs
- H10D64/514—Gate electrodes for field-effect devices for FETs for IGFETs characterised by the insulating layers
Landscapes
- Junction Field-Effect Transistors (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
- Semiconductor Memories (AREA)
- Non-Volatile Memory (AREA)
- Electrodes Of Semiconductors (AREA)
- Formation Of Insulating Films (AREA)
Description
本發明係有關一種半導體裝置及其製造方法,特別是關於一種高電子遷移率電晶體。
在半導體技術中,III-V族半導體化合物可用於形成各種積體電路裝置,例如高功率場效電晶體、高頻電晶體或高電子遷移率電晶體(High electron mobility transistor,HEMT),此III-V族半導體化合物具有取代傳統矽電晶體之潛力。
然而,當III-V族半導體化合物為氮化鎵或氧化鎵時,通道將呈現常開型(normally-on)的狀態,由於常開模式之電晶體其臨界電壓(threshold voltage)為負值,即電晶體在零閘極偏壓時,電晶體仍會導通電流並形成額外之功率損耗。目前,解決此問題之方法,例如減薄氮化鎵層、離子佈植、或利用p型氧化鎵調整能帶結構使其臨界電壓大於0V,但由於電晶體在應用時,閘極電壓會隨著汲極偏壓
有一不穩定之擾動造成誤啟動之現象,故其電晶體之臨界電壓需大於6V以上才能有效避免誤啟動現象發生,故需要進行改良。目前學術及業界所使用避免誤啟動的方式大多屬於增加額外電路進行改良,但此方法會形成寄生效應造成不必要之能量耗損,此外也會增加製造成本。本專利闡述之技術不但能夠使臨界電壓大於6V且具有良好的元件特性。
根據本發明之多個實施方式,係提供一種半導體裝置,包含:基材、通道層、阻障層、凹槽、汲極、源極、電荷陷阱層、鐵電材料和閘極;通道層配置於基材上;阻障層配置於通道層上,阻障層具有凹槽,且凹槽下方之阻障層具有一厚度;汲極和源極配置於阻障層上;電荷陷阱層覆蓋凹槽的底面;鐵電材料配置於電荷陷阱層上;以及閘極配置於鐵電材料上。
在某些實施方式中,半導體裝置更包含第一介電層配置於凹槽的底面和電荷陷阱層之間。
在某些實施方式中,半導體裝置更包含第二介電層配置於鐵電材料和閘極之間。
在某些實施方式中,第一介電層具有一能隙(bandgap),能隙介於7-12eV。
在某些實施方式中,凹槽下方之阻障層厚度介
於5-12nm。
在某些實施方式中,鐵電材料為BaTiO3、KH2PO4、HfZrO2、SrBi2Ta2O9或PbZrTiO3。
本發明之多個實施方式,係提供一種製造半導體裝置的方法,包含:提供一基材;形成通道層於基材上;形成阻障層於通道層上;形成源極和汲極於阻障層上;形成凹槽於阻障層中,凹槽具有底面,凹槽下方之阻障層具有厚度;形成電荷陷阱層覆蓋凹槽的底面;形成鐵電材料於電荷陷阱層上;將鐵電材料加熱至第一溫度,第一溫度大於鐵電材料之結晶溫度;將鐵電材料降溫至第二溫度,使鐵電材料結晶;以及形成閘極於鐵電材料上。
在某些實施方式中,在形成凹槽於阻障層後,更包含形成第一介電層覆蓋凹槽的底面。
在某些實施方式中,形成鐵電材料的方法包含電漿輔助原子層沉積、有機金屬化學氣相沉積、化學氣相沉積、物理氣相沉積、濺鍍或脈衝雷射蒸鍍。
在某些實施方式中,第一溫度介於400-600℃。
為使本發明之上述及其他目的、特徵和優點更明顯易懂,下文特舉出較佳實施例,並配合所附圖示詳細說明如下。
110‧‧‧基材
112‧‧‧基板
114‧‧‧緩衝層
120‧‧‧通道層
130‧‧‧阻障層
210‧‧‧第一介電層
220‧‧‧電荷陷阱層
230‧‧‧鐵電材料
240‧‧‧第二介電層
250‧‧‧閘極
260‧‧‧鈍化層
R‧‧‧凹槽
S‧‧‧源極
D‧‧‧汲極
w‧‧‧寬度
d1‧‧‧深度
d2‧‧‧厚度
第1圖至第4C圖係繪示依照本發明各種實施方式之一種半導體裝置之製造方法之各製程階段的剖面示意圖。
第5A圖及第5B圖為根據本發明某些實施方式之半導體裝置的ID-VGS特性曲線。
以下將詳細討論本實施例的製造與使用,然而,應瞭解到,本發明提供實務的創新概念,其中可以用廣泛的各種特定內容呈現。下文敘述的實施方式或實施例僅為說明,並不能限制本發明的範圍。
此外,在本文中,為了易於描述圖式所繪的某個元件或特徵和其他元件或特徵的關係,可能會使用空間相對術語,例如「在…下方」、「在…下」、「低於」、「在…上方」、「高於」和類似用語。這些空間相對術語意欲涵蓋元件使用或操作時的所有不同方向,不只限於圖式所繪的方向而已。裝置可以其他方式定向(旋轉90度或定於另一方向),而本文使用的空間相對描述語則可相應地進行解讀。
以下提供各種關於半導體裝置及其製作方法的實施例,其中詳細說明此半導體裝置的結構和性質以及此半導體裝置的製備步驟或操作。
高電子遷移率電晶體(High electron mobility
transistor,HEMT)由於具有高輸出功率、高崩潰電壓、耐高溫等優良特性,近年來已被廣泛應用於高功率電路系統中。而傳統之高電子遷移率電晶體由於結構中通道層和阻障層之間具大量極化電荷,這些極化電荷形成二維電子氣(two dimensional electron gas,2DEG),使電子具有高遷移率。此時電晶體在無施加閘極偏壓時,仍會導通電流,因此被稱為常開式(normally-on)電晶體。常開式電晶體的臨界電壓(threshold voltage)為負值,即電晶體在零閘極偏壓時,電晶體仍會導通電流,形成額外之功率損耗,此外,常開式電晶體無法避免失效安全之意外,具有潛在危險性。因此,常關式電晶體之技術發展為目前高功率電晶體之重要課題,此外,由於高功率電路系統需在高偏壓的環境下進行操作,在此高偏壓環境下,容易產生瞬間脈衝電壓,如果電晶體之臨界電壓不夠高,容易導致高功率元件不正常導通,造成電路之誤動作並影響電路系統之穩定度。因此本發明提供一種具有高臨界電壓的高電子遷移率電晶體裝置,即常關式(normally-off)的高電子遷移率電晶體,而且能同時維持高輸出電流。
第1圖至第4C圖係繪示依照本發明各種實施方式之一種半導體裝置之製造方法之各製程階段的剖面示意圖。
在第1圖中,提供基材110,基材110包含基板112和緩衝層114,緩衝層114配置於基板112上。基板112可為矽(Si)基材、碳化矽(SiC)基材、藍寶石(sapphire)基
材、氮化鎵(GaN)基材、氮化鋁鎵(AlGaN)基材、氮化鋁(AlN)基材、磷化鎵(GaP)基材、砷化鎵(GaAs)基材、砷化鋁鎵(AlGaAs)基材或其他包含III-V族元素之化合物形成之基材。在某些實施方式中,緩衝層114包含GaN或p型摻質摻雜的GaN。可使用磊晶製程或其他適當的方法形成緩衝層114。在一實施例中,p型摻質包含碳、鐵、鎂、鋅或其他適當的p型摻質。緩衝層可降低漏電流及避免形成通道層120時的磊晶製程中發生龜裂現象。在另一實施例中,基材110包含基板112、晶種層(未繪示)和緩衝層114。晶種層配置於基板112上,緩衝層114配置於晶種層上。晶種層有助於補償基板112和緩衝層114間晶格結構的錯配(mismatch)。
接著形成通道層120於基材110上,再形成阻障層130於通道層120上。基材通道層120可為氮化鋁鎵(AlGaN)、氮化鎵(GaN)、氮化銦鎵(InGaN)、氮化鋁銦鎵(AlInGaN)或其他包含III-V族元素之化合物。障壁層130可為氮化鋁(AlN)、氮化鋁銦(AlInN)、AlGaN、GaN、InGaN、AlInGaN或其他包含III-V族元素之化合物。通道層120之能隙小於阻障層130之能隙,且通道層120和阻障層130的組合和厚度必須能夠產生二維電子氣。在一實施方式中,通道層120或/及阻障層130可為多層結構。在另一實施方式中,可再形成其他層,例如在通道層120和阻障層130之間形成一中間層(未繪示)、形成一摻雜層(未繪示)於阻障
層130上方以增加二維電子氣的電子或形成一覆蓋層(未繪示)於阻障層130上以防止阻障層130氧化。
請參照第2圖,形成源極S和汲極D於阻障層130上。源極S和汲極D各自選於下列組合,包含但不限於銀(Ag)、銅(Cu)、鎢(W)、鈦(Ti)、鉭(Ta)、鋁(Al)、鎳(Ni)、釕(Ru)、鈀(Pd)、鉑(Pt)、錳(Mn)、氮化鎢(WN)、氮化鈦(TiN)、氮化鉭(TaN)、氮化鋁(AlN)、矽化鎢(WSi)、氮化鉬(MoN)、矽化鎳(Ni2Si)、矽化鈦(TiSi2)、鋁化鈦(TiAl)、砷(As)摻雜之多晶矽、氮化鋯(ZrN)、TaC、TaCN、TaSiN、TiAlN、矽化物或其任意之組合。形成源極S和汲極D的方法可使用任何習知之製程。
如第3圖所示,利用圖案化製程在阻障層130中形成凹槽R。在一實施方式中,可在阻障層130上形成遮罩層,遮罩層例如為硬遮罩或光阻,並在遮罩層上形成圖案,再利用蝕刻製程將圖案轉移至底下的阻障層130中形成凹槽R,其中蝕刻製程可為反應式離子蝕刻、電漿乾式蝕刻或其他非等向性蝕刻方式,蝕刻氣體使用六氟化硫、四氯化矽、八氟環丁烷、甲烷、氫氣、氬或其他已知蝕刻氣體或其組合。在另一實施方式中,在形成遮罩層後使用濕式蝕刻製程蝕刻出凹槽R,使凹槽R的底角圓滑化。
凹槽R具有深度d1和寬度w,深度d1介於15-25nm,例如15nm、20nm或25nm;寬度w介於
0.1μm-3μm,例如0.5μm、1μm、2μm、2.5μm。凹槽R位於源極S和汲極D的中間而且並未貫穿阻障層130,目的在於削弱阻障層130之極化現象並消除二維電子氣通道之載子,使之臨界電壓大於0V。因較薄的阻障層會提升導帶能階,故減少閘極區域底下之阻障層厚度可驅趕(deplete)二維電子氣。凹槽R的底面和通道層120上表面之間的阻障層130具有厚度d2,厚度d2介於0-10nm,例如1nm、3nm、5nm或8nm。需要注意的是,若厚度d2的厚度大於10nm,會使阻障層130仍具有大量極化電荷,進而使通道成為常開型的狀態。
在某些實施方式中,凹槽R的寬度小於3μm,例如0.05μm、0.5μm、1μm或2μm。在某些實施方式中,凹槽R和源極S、汲極D的距離不同,在一實施例中,凹槽R的邊緣和源極S的距離介於1~3μm,例如1.5μm、2μm或2.5μm。凹槽R的邊緣和汲極D的距離介於5~15μm,例如7.5μm、10μm或12.5μm。
第4A-4C圖係提供不同的鐵電材料複合層實施方式。如第4A-4C圖所示,在形成凹槽R之後,形成鐵電材料複合層於凹槽內。形成鐵電材料複合層的方式包含但不限於電漿輔助原子層沉積、有機金屬化學氣相沉積、化學氣相沉積、物理氣相沉積、濺鍍或脈衝雷射蒸鍍。形成鐵電材料複合層之後可以選擇性地使用圖案化製程使鐵電材料複合
層的側面與凹槽R的側面切齊。在一實施方式中,鐵電材料複合層的寬度等於凹槽R的寬度w。
在第4A圖中,鐵電材料複合層包含電荷陷阱層220(或稱電荷儲存層)和鐵電材料230。電荷陷阱層220覆蓋凹槽R的底面,鐵電材料230配置於電荷陷阱層220上。閘極250配置於鐵電材料230上。鈍化層260覆蓋阻障層130。電荷陷阱層220可例如為氮化矽、HfON、HfO2、ZrO2、介電層或被絕緣材料所環繞之奈米晶體層。電荷陷阱層220的厚度介於1-4nm,例如1.5nm、2nm、2.5nm或3nm,取決於選用的材料之特性。在一實施方式中,電荷陷阱層220為多層結構,此多層結構可包含上述電荷陷阱層220材料的組合。在一實施方式中,鈍化層260可為AlN、Al2O3、AlON、SiN、SiO2、SiON或Si3N4。
在各種實施方式中,鐵電材料230可為BaTiO3、KH2PO4、HfZrO2、SrBi2Ta2O9(SBT)、PbZrTiO3(PZT)或其他可引發鐵電效應的材料。所謂的鐵電效應,是指材料本身在外加電場之下,具備自發性極化(spontaneous polarization)及極化轉換(polarization transition)的特性。當施加外電場時,會使電偶極順著電場方向排列,而在電場移去後,仍能保持極化方向的殘留極化(remnant polarization,Pr),此一效應稱為鐵電效應。對於任何鐵電材料而言,具有殘留極化表示其擁有永久極化
能力。在形成鐵電材料230後,使用熱退火處理,將鐵電材料230升溫至第一溫度,第一溫度高於鐵電材料230的結晶溫度,再將鐵電材料230降溫至一第二溫度,使鐵電材料230結晶形成鐵電材料。在實施方式中,第一溫度介於400-600℃,例如450℃、500℃或550℃。第二溫度介於25-100℃,例如25℃或80℃。
在第4B圖中,提供另一種鐵電材料複合層的實施方式。在此實施方式中,先形成第一介電層210於凹槽R內,再形成電荷陷阱層220於第一介電層210上,接著形成鐵電材料230於電荷陷阱層220上。之後形成閘極250於鐵電材料230上。鈍化層260覆蓋阻障層130。第一介電層210的功能為寬能隙阻擋層,具有一能隙(bandgap),且此能隙介於7-12eV,例如8eV、9eV、11eV、13eV或15eV。第一介電層210能降低漏電流以及提升閘極崩潰電壓。第一介電層210可為Al2O3、SiO2或其他能隙介於7-12eV的材料。形成電荷陷阱層220和鐵電材料230的方法已在前文敘述過,故不再重複敘述。
在第4C圖中,提供另一種鐵電材料複合層的實施方式。鐵電材料複合層包含第一介電層210配置於凹槽內,電荷陷阱層220配置於第一介電層210,鐵電材料230配置於電荷陷阱層220上,第二介電層240配置於鐵電材料230上。閘極250配置於第二介電層240上。鈍化層260覆蓋
阻障層130。第二介電層240和第一介電層210皆為寬能隙阻擋層,具有一能隙(bandgap),且此能隙介於7-12eV,例如8eV、9eV、11eV、13eV或15eV。第二介電層240能降低漏電流以及提升閘極崩潰電壓。第二介電層240可為Al2O3、SiO2或其他能隙介於7-12eV的材料。
在此半導體裝置中,當施加正電壓於閘極250時,鐵電材料230會極化並抓取電荷,而電荷陷阱層220提供儲存電荷的地方。此時閘極250和鐵電材料複合層下方的能隙便會開始改變,阻障層130之表面負電位開始增加,進而使半導體裝置之臨界電壓值往正方向移動。
在一實施方式中,鐵電材料230極化後,半導體裝置的臨界電壓變化值可大於5V,其臨界電壓從接近0V改變為大於5V,即成為增強型的半導體裝置。在另一實施方式中,可藉由調整凹槽R的深度來調整臨界電壓。在阻障層130厚度相同的情況下,當厚度d2越薄,半導體裝置的臨界電壓值會越往正值方向移動,但其最大汲極電流也會降低,因此厚度d2必須控制在一定的範圍內。
第5A圖及第5B圖為根據本發明某些實施方式之半導體裝置的ID-VGS特性曲線。曲線A代表鐵電材料230極化前,曲線B則代表鐵電材料230極化後。如第5A圖所示,鐵電材料230極化後,半導體裝置的臨界電壓(Vth)從極化前的2.5V變為10V。如第5B圖所示,此半導體裝置的
Ion/Ioff比值為6x108。
綜上所述,本發明之各實施例提供一種半導體裝置,利用鐵電材料之永久極化效應造成能帶變化,使半導體裝置擁有高臨界電壓以減低額外功率耗損並增加電路系統穩定度。
上文概述若干實施例之特徵結構,使得熟習此項技術者可更好地理解本發明之態樣。熟習此項技術者應瞭解,可輕易使用本發明作為設計或修改其他製程及結構的基礎,以便實施本文所介紹之實施例的相同目的及/或實現相同優勢。熟習此項技術者亦應認識到,此類等效結構並未脫離本發明之精神及範疇,且可在不脫離本發明之精神及範疇的情況下做出對本發明的各種變化、替代及更改。
110‧‧‧基材
112‧‧‧基板
114‧‧‧緩衝層
120‧‧‧通道層
130‧‧‧阻障層
220‧‧‧電荷陷阱層
230‧‧‧鐵電材料
250‧‧‧閘極
260‧‧‧鈍化層
S‧‧‧源極
D‧‧‧汲極
Claims (10)
- 一種半導體裝置,包含:一基材;一通道層配置於該基材上;一阻障層配置於該通道層上,該阻障層具有一凹槽,且該凹槽下方之該阻障層具有一厚度;一汲極和一源極配置於該阻障層上;一電荷陷阱層覆蓋該凹槽的一底面;一鐵電材料配置於該電荷陷阱層上;以及一閘極配置於該鐵電材料上。
- 如請求項1所述之半導體裝置,更包含一第一介電層配置於該凹槽的該底面和該電荷陷阱層之間。
- 如請求項2所述之半導體裝置,更包含一第二介電層配置於該鐵電材料和該閘極之間。
- 如請求項2所述之半導體裝置,其中該第一介電層具有一能隙(bandgap),該能隙介於7-12eV。
- 如請求項1所述之半導體裝置,其中該厚度介於5-15nm。
- 如請求項1所述之半導體裝置,其中該鐵電材料為BaTiO3、KH2PO4、HfZrO2、SrBi2Ta2O9或PbZrTiO3。
- 一種製造半導體裝置的方法,包含:提供一基材;形成一通道層於該基材上;形成一阻障層於該通道層上;形成一源極和一汲極於該阻障層上;形成一凹槽於該阻障層中,該凹槽具有一底面,該凹槽下方之該阻障層具有一厚度;形成一電荷陷阱層覆蓋該凹槽的該底面;形成一鐵電材料於該電荷陷阱層上;將該鐵電材料加熱至一第一溫度,該第一溫度大於該鐵電材料之一結晶溫度;將該鐵電材料降溫至一第二溫度,使該鐵電材料結晶;以及形成一閘極於該鐵電材料上。
- 如請求項7所述之方法,在形成一凹槽於該阻障層後,更包含形成一第一介電層覆蓋該凹槽的該底面。
- 如請求項7所述之方法,其中形成該鐵電材料的方法包含電漿輔助原子層沉積、有機金屬化學氣相沉積、化學氣相沉積、物理氣相沉積、濺鍍或脈衝雷射蒸鍍。
- 如請求項7所述之方法,其中該第一溫度介於400-600℃。
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| JP2017053220A JP6305596B1 (ja) | 2016-12-15 | 2017-03-17 | 半導体装置及びその製造方法 |
| US15/644,830 US20180175185A1 (en) | 2016-12-15 | 2017-07-10 | Semiconductor device and method of manufacturing the same |
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| CN111834439B (zh) * | 2019-04-22 | 2025-11-04 | 珠海格力电器股份有限公司 | 一种高电子迁移率晶体管、其制备方法及电子装置 |
| CN110676370B (zh) * | 2019-09-12 | 2022-12-09 | 深圳第三代半导体研究院 | 一种GaN基热敏器件及其制备方法 |
| US11315951B2 (en) * | 2019-11-11 | 2022-04-26 | Electronics And Telecommunications Research Institute | Semiconductor device and method of fabricating the same |
| JP7495712B2 (ja) * | 2020-02-27 | 2024-06-05 | 株式会社ノベルクリスタルテクノロジー | 電界効果トランジスタ及びその設計方法 |
| US11569382B2 (en) * | 2020-06-15 | 2023-01-31 | Taiwan Semiconductor Manufacturing Company, Ltd. | Semiconductor device and method of fabricating the same |
| KR20230048000A (ko) * | 2020-08-10 | 2023-04-10 | 도쿄엘렉트론가부시키가이샤 | 반도체 디바이스용 선택형 분극을 갖는 유전체 재료의 형성 방법 |
| CN113659029B (zh) * | 2021-07-08 | 2024-11-15 | 中国科学院宁波材料技术与工程研究所 | 一种氧化镓日盲紫外探测器 |
| TWI799127B (zh) * | 2022-02-09 | 2023-04-11 | 新唐科技股份有限公司 | 高電子遷移率半導體結構和高電子遷移率半導體裝置 |
| TWI840003B (zh) * | 2022-12-08 | 2024-04-21 | 台亞半導體股份有限公司 | 高電子遷移率電晶體及其製造方法 |
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| US20180175185A1 (en) | 2018-06-21 |
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| CN108231863B (zh) | 2021-11-30 |
| JP6305596B1 (ja) | 2018-04-04 |
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