201116651 六、發明說明： 【發明所屬之技術領域】 本發明係關於-種蝕刻劑組合物，且特別關於用於鈦鋁 複合金屬層之蝕刻劑組合物，其可有效控制蝕刻後之金屬 層的錐形角度（taper angle)在約2〇度至約度之間，並且 不會對基板表面造成損傷。本發明之蝕刻劑組合物可應用 • 於具有鈦鋁複合金屬層結構之平面顯示器、積體電路、覆 晶封裝（flip chip)、印刷電路板或微機電等應用的蝕刻製 程中。 【先前技術】 在半導體及平面顯示器製程中的導線及電極（閘極、源 極及沒極）材料最初以絡為主，但隨著環保意識日漸高 漲’鉻製程將逐漸遭到禁止。 鋁在地殼中蘊藏豐富，並具有較低的金屬導體電阻率及 較好的圖案製作能力。但銘和石夕基板或玻璃基板之膨服係 .‘冑不同®此在製程中遇高溫會產生凸起，而此凸起現象 令易知成閘極與源極/汲極兩導體線路間短路。在鋁薄膜 上覆蓋銷或㈣呂合金或在紹中加入敍形成合金，以複合金 屬層的形式使用於電極材料，可解決以上問題。此_或 銘敍複口金屬層可使用磷酸作為主要成分之钱刻劑來進行 蝕刻。但因翻及斂的價格昂貴，並且有較易氧化的現象， 因此近年來已使用鈦或鈦合金來替代。鈦金屬可以作為銘 導線的潤濕層，提高銘原子的階梯覆蓋能力，並可作為用 來降低金屬與石夕或破璃的接觸電阻。然而，原本用來餘刻 l329S3.doc 1 201116651 由鈿或鉬合金及鋁合金所構成之複合金屬層的姓刻劑，並 無法用來钱刻欽或欽合金。 雖然現今在半導體或平面顯示器製程中通常是以氫氟酸 系姓刻劑來蝕刻鈦或鈦合金，但使用氫氟酸系蝕刻劑會使 得矽或玻璃基板表面遭受損傷而無法使用。 【發明内容】 鑑此，本發明之主要目的在於提供一種可以有效地蝕刻 鈦紹複合金屬層的蝕刻劑組合物，並且不會對基板表面造 成損傷。 本發明之蝕刻劑組合物包含，以組合物總重量計，約 〇. 1重里％至約5重量％之至少一種含氟四級銨化合物 '約 〇·5重量％至約20重量％之至少一種氧化劑、約〇2重量％至 約20重量％之至少一種酸性化合物、及水性介質。 本發明之另一目的在於提供一種使用本發明之蝕刻劑組 合物蝕刻鈦鋁複合金屬層之方法，其可有效控制蝕刻後該 金屬層的錐形角度在約2〇度至約6〇度之間，並且不會對基 板表面造成損傷。 本發明係使用接近令性的含氟四級銨化合物來取代習知 使用的氫氟酸或氫氟酸之銨鹽。由於四級銨化合物比一般 的銨鹽（ΝΗ^具有更大的立體結構障礙，因此，相較於小 分子的氟化銨更不容易腐蝕矽及玻璃基板表面。此外，本 發明藉由添加酸性化合物，以與含氟四級銨化合物形成醆 性的氟離子緩衝溶液’因此，可穩定持續地釋出部份解離 的亂離子，保持氟離子濃度在固定的範圍，藉以改善溶液 132983.doc 201116651 在钱刻過私中因氟離子濃度下降而造成對欽/18金屬餘刻 速度變慢的缺點。 【實施方式】 ▲本發明係關於—種㈣劑，其包含，以組合物總重量 -十’約0.1重量％至約5重量％之至少_種含氟四級銨化合 $、約0.5重量％至約2〇重量％之至少一種氧化劑、約重 直％至約20重量❶/。之至少一種酸性化合物、及水性介質。 適合以本發明㈣劑組合物進行㈣之鈦㈣合金屬層 係包含至少一鈦或鈦合金金屬詹及至少-結或銘合金金屬 層0 本發明係利用含氟四級胺化合物與酸性化合物所形成的 氣化氫緩衝溶液來進行主要㈣，以溶解鈦㈣合金屬層 中之氧化鋁及氧化鈦中氧化鋁及氧化鈦是經由蝕刻劑 組合物中所含之氧化劑對鈦鋁複合金屬層中之鋁合金及鈦 合金氧化所形成。 適用於本發明㈣劑組合物中之含氣四級敍化合物係具 通式㈣㈣仰，其中Rl、R2 ' &及&可獨立為相同或 不同之直鏈或分支CVC6-烷基（較佳為^^4·烷基）、直鏈或 刀支C2 CV烯基（較佳為烯基）、或C^C8—環烷基，其 中燒基、縣或環烧基可視需要經至少—個經基取代。在 本發明之具體實施態樣中，^鳴鳴㈣較佳獨立為相 同或不同之直鏈或分支^^4—院基。在本發明之具體實施 態樣中，纟氟四級銨化合物可為四甲基氟化銨、四乙基氟 化錄、四丙基氟⑽或四了基氟傾，最佳為四甲基氣化 132983.doc 201116651 敍。 本發明所使用之含氟四級銨化合物的含量，以蝕刻劑組 合物總重量計，為約〇· 11量至約5重量％，較佳為約0.2重 量°/。至約3重量％。 本發明所使用之氧化劑係作為蝕刻前的起始劑，用於氧 化鈦紹複合金屬層中之鋁、鈦或鋁鈦合金’其可為技藝中 已知適用於氧化鈦鋁複合金屬之各種氧化劑，例如（但不 限於）選自由硝酸、過氯酸、過氧化物、或其鹽及其混合 物所組成之群，較佳係選自由硝酸、硝酸銨、硝酸銨鈽、 過氯酸、過氣酸銨、過氯酸鈉、過氣酸鉀、過氧二硫酸 銨、過氧二硫酸鉀、過氧化氫及其混合物所組成之群。 本發明所使用之氧化劑的含量，以蝕刻劑組合物總重量 计，為約0.5重量％至約2〇重量％，更佳為丄〇%至1〇%。 本發明所使用之酸性化合物係可與含氟四級胺化合物形 成的氟化氫緩衝溶液，以溶解鈦鋁複合金屬層中之氧化鋁 及氧化鈦，其可為本領域中已知可使含氟四級録化合物解 離的酸性化合物，例如（但不限於）選自由硫酸、氫氯酸、 醋酸、磷酸及其混合物所組成之群的酸性化合物。 :發明所使用之酸性化合物的含量，以蝕刻劑組合物總 重量計，為約0.2重量％至約2〇重量％，更佳為〇5%至 10〇/〇 〇 本發明所使用的水性介質對於此技術領域中具有通常知 識者而言軸而易知的，例如水、蒸館水、超純水及去離 子水，較佳係超純水或去離子水。 132983.doc 201116651 本發明之#刻劑組合物係用於鈦鋁電子線路圖案之成 形’具有姓刻速率快及可控制蝕刻後該鈦鋁複合金屬層的 錐形角度在約20度至約60度之間等優點。根據本發明之一 具體實施態樣，本發明之蝕刻劑組合物可應用於具有鈦鋁 複合金屬層結構之平面顯示器、積體電路、覆晶封裝⑺斤 chip)、印刷電路板或微機電等應用之蝕刻製程中。 據此，本發明另提供一種鈦鋁複合金屬層之蝕刻方法， 其包括： 提供一基板； 於該基板上形成第一鈦金屬層； 於該第一鈦金屬層上形成鋁金屬層； 於該紹金屬層上形成第二鈦金屬層； 於該第二鈦金屬層上形成圖案化光阻層；及 以該圖案化光阻層為罩幕，使用具有如前所定義之組份 及比例的蝕刻劑組合物對該第一鈦金屬層、該鋁金屬層 及該第二鈦金屬層進行蝕刻製程。 根據本發明之一具體實施態樣，在本發明鈦鋁複合金層 屬之蝕刻方法中，該第一鈦金屬層及該第二鈦金屬層包含 2或鈦合金，及該鋁金屬層包含鋁或铭合金，且形成該第 一鈦金屬層、該鋁金屬層及該第二鈦金屬層之方法可以本 技術領域習知之—船方法谁;^ 1 , 舣万忐進仃，例如但不限於，物理氣相 沈積法、化學氣相沈積法或電錄法。 本^月姓刻方法中對於所要姓刻之包含鈦铭複合金屬層 的基板並無特別㈣’例如但不限於1基板或玻璃基 132983.doc 201116651 板，如矽晶或二氧化矽玻璃基板β 根據本發明之鈦鋁複合金屬層之蝕刻方法可在本技術領 域習知之一般操作條件下進行。於一具體實施態樣中，本 發明之蝕刻方法的溫度範圍為約丨5。匸至約5〇。匚，較佳為約 25°C至約40°C ;蝕刻處理時間為約〇 5分鐘至約1〇分鐘。 本發明之蝕刻方法能有效對鈦鋁複合金屬層進行蝕刻， 而不會對矽或玻璃基板表面造成損傷，並可控制蝕刻後該 鈦铭複合金屬層的錐形角度在約2〇度至約60度之間。 以下實施例係用於對本發明作進一步說明，唯非用以限 制本發明之範圍β任何熟悉此項技藝之人士可輕易達成之 修飾及改變均包括於本案說明書揭示内容及所附申請專利 範圍之範圍内。 實施例 圖1係在姓刻前（a)及姓刻後（b)，於玻璃基板上形成鈦鋁 複合金屬層及圖案化光阻層之側視圖。 如圖1(a)所示，提供一玻璃基板（1)，於基板上形成7〇〇a 鈦金屬（2)/210〇A鋁金屬（3)/20〇A鈦金屬（2)之複合金屬層， 接著於鈦鋁複合金屬層上形成圖案化光阻層（4)，然後於溫 度約3 5 °C下，將基板浸潰於表1之實例1至14的姓刻劑組合 物中’待蝕刻完畢後，使用超純水洗滌玻璃基板，並以氮 氣乾燥，得到如圖1 (b)所示之包含姓刻後之鈦鋁複合金屬 層巧基板。 132983.doc 201116651 表1 實例 蝕刻劑組合物(重量％)，其餘為水 姓刻時間 (分鐘） 導線錐形 角度 基板 損傷 1 四曱基氟化銨：硫酸：硝酸=0.6 : 1_0 : 3.0 2.0 25 否 2 四甲基氟化銨：硫酸：硝酸=1.0 : 1.0 : 3.0 1.4 22 否 3 四曱基氟化銨：硫酸：硝酸=1.0 : 10·0 : 3.0 2.5 20 微 4 四甲基氟化銨：硫酸：硝酸=3.0: 1.0:3.0 0.5 20 微 5 四曱基氟化銨：氫氣酸：硝酸=1.0 : 1.0 : 3_0 2.1 30 否 6 四甲基氟化銨：醋酸：硝酸=1.0 : 2.0 : 3.0 3.5 25 否 7 四甲基氟化銨：醋酸：硝酸=1.0 :2.0: 15.0 0.6 20 微 S 四甲基氟化銨：醋酸：硝酸=1.0 : 15.0 : 3.0 1.1 22 微 9 四甲基氟化銨：硫酸：硝酸：過氧二硫酸銨=1.0 : 1.0 : 3.0 : 1.0 1.5 35 否 10 四曱基氟化銨：硫酸：硝酸：過氧二硫酸銨=1.0 : 1.0 : 3.0 : 2.0 1.6 63 否 11 四甲基氟化銨：硫酸：過氧化氫=1.0 : 1.0 : 5.0 1.2 60 否 12 四曱基氟化銨：硫酸··過氧化氫=1.0 : 3.0 : 5.0 L4 48 否 13 四曱基氟化銨：硫酸：過氧化氬=1.0 : 3.0 : 10·0 L5 70 否 14 四甲基氟化銨：硫酸：硝酸：過氧化氫=1.0 : 1.0 : 3.0 :3.0 1,3 45 否 藉由掃瞄式電子顯微鏡（SEM)觀察經蝕刻後之鈦鋁複合 金屬層的形狀，其中實例1的SEM照片如圖2所示，實例7 的SEM照片如圖3所示。在本發明之蝕刻劑組合物中，當 含氟四級銨化合物之濃度小於約5重量％時，不會對矽或 玻璃基板造成損傷；當含氟四級銨化合物之濃度高於約 0.1重量％時，可增加對鈦或鈦合金的蝕刻能力，且蝕刻後 的形狀較佳。 當氧化劑之濃度高於約0.5重量％時，對鈦或鈦合金的蝕 刻較快，效果較好；當氧化劑的含量低於約20重量％時， 不會對光阻造成損傷，又可以藉由單獨使用或與其他氧化 劑組合使用來改變姓刻後之複合金屬層的錐形角度。 综上所述，本發明之蝕刻劑組合物及蝕刻方法不但可以 132983.doc 201116651 有效地蝕刻在基板上之鈦鋁複合金屬層，且不會對基板表 面及光阻造成損傷，適合用於鈦鋁電子線路圖案之成形， 並具有钱刻速率快及可控制蝕刻後該鈦鋁複合金屬層的錐 形角度在約20度至約60度之間等優點。 雖然本發明已以較佳實施例揭露如上，然其並非用以限 定本發明，任何熟習此技藝者，在不脫離本發明之精神與 範圍内’當可做些許之改變與潤飾，因此本發明之保護範 圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 圖1係在蝕刻前（a)及蝕刻後（b)，於玻璃基板上形成鈦鋁 複合金屬層及圖案化光阻層之側視圖。 圖2係藉由掃瞄式電子顯微鏡觀察在實例1中，蝕刻後之 欽IS複合金屬層的形狀之照片圖。 圖3係藉由掃瞄式電子顯微鏡觀察在實例7中，钱刻後之 鈦紹複合金屬層的形狀之照片圖。 【元件符號說明】 (1) 玻璃基板 (2) 鈦金屬層 (3) 鋁金屬層 (4) 圊案化光阻層 132983.doc -10-201116651 VI. Description of the Invention: [Technical Field] The present invention relates to an etchant composition, and more particularly to an etchant composition for a titanium-aluminum composite metal layer, which can effectively control the metal layer after etching The taper angle is between about 2 degrees and about degrees and does not cause damage to the surface of the substrate. The etchant composition of the present invention can be applied to an etching process of a flat panel display, an integrated circuit, a flip chip, a printed circuit board or a microelectromechanical device having a titanium aluminum composite metal layer structure. [Prior Art] In the semiconductor and flat panel display process, the wires and electrodes (gate, source, and immersion) are initially dominated by the network, but as the environmental awareness grows higher, the chrome process will be gradually banned. Aluminum is abundant in the earth's crust and has a low metal conductor resistivity and good patterning ability. However, Ming and Shixi substrates or glass substrate expansion system. '胄 Different® This will cause bumps in the process of high temperature, and this convex phenomenon makes it easy to know between the gate and the source/drain two conductor lines. Short circuit. The above problem can be solved by covering the pin on the aluminum film or (4) Lu alloy or adding an alloy to the alloy in the form of a composite metal layer. This _ or inscription of the metal layer can be etched using a phosphoric acid as a main component. However, titanium or titanium alloys have been used in recent years because of the high price and the tendency to oxidize. Titanium can be used as a wetting layer for the wire, which improves the step coverage of the Ming atom and can be used as a contact resistance to reduce the contact resistance between metal and stone or glass. However, the original engraving of the composite metal layer consisting of tantalum or molybdenum alloy and aluminum alloy was not used for the engraving of l329S3.doc 1 201116651. Although titanium or titanium alloys are usually etched with a hydrofluoric acid-based surname in the semiconductor or flat panel display process, the use of a hydrofluoric acid-based etchant may cause damage to the surface of the resulting or glass substrate and may be unusable. SUMMARY OF THE INVENTION Accordingly, it is a primary object of the present invention to provide an etchant composition which can effectively etch a titanium-based composite metal layer without causing damage to the surface of the substrate. The etchant composition of the present invention comprises, based on the total weight of the composition, from about 1% by weight to about 5% by weight of at least one fluorine-containing quaternary ammonium compound from about 5% by weight to about 20% by weight. An oxidizing agent, from about 2% by weight to about 20% by weight of at least one acidic compound, and an aqueous medium. Another object of the present invention is to provide a method for etching a titanium aluminum composite metal layer using the etchant composition of the present invention, which can effectively control the taper angle of the metal layer after etching to be about 2 to about 6 degrees. There is no damage to the surface of the substrate. In the present invention, a fluorine-containing quaternary ammonium compound which is similar in nature is used in place of the ammonium salt of hydrofluoric acid or hydrofluoric acid which is conventionally used. Since the quaternary ammonium compound has a larger steric structure than the general ammonium salt, it is less likely to corrode the surface of the glass substrate than the ammonium fluoride of the small molecule. Further, the present invention is added by adding acidity. The compound forms a hydrophobic fluoride buffer solution with the fluorine-containing quaternary ammonium compound. Therefore, the partially dissociated chaotic ions can be stably and continuously released, and the fluoride ion concentration is maintained in a fixed range, thereby improving the solution 132983.doc 201116651 In the case of money, the disadvantage of slowing down the concentration of fluoride ions caused by the decrease of the concentration of fluoride ions. [Embodiment] ▲ The present invention relates to a kind of (four) agent, which comprises the total weight of the composition - ten 'from about 0.1% by weight to about 5% by weight of at least one fluorine-containing quaternary ammonium compound, from about 0.5% by weight to about 3% by weight of at least one oxidizing agent, from about 5% by weight to about 20% by weight. An acidic compound and an aqueous medium. The titanium (tetra) metal layer suitable for carrying out the (four) agent composition of the present invention comprises at least one titanium or titanium alloy metal and at least a knot or alloy metal layer. The main (4) is carried out by using a vaporized hydrogen buffer solution formed of a fluorine-containing quaternary amine compound and an acidic compound to dissolve aluminum oxide and titanium oxide in the titanium (tetra) metal layer through the etchant composition. The oxidant contained is formed by oxidizing an aluminum alloy and a titanium alloy in the titanium-aluminum composite metal layer. The gas-containing quaternary compound compound suitable for use in the composition of the invention (4) has a general formula (4) (four), wherein Rl, R2 ' & And & can be independently the same or different straight or branched CVC6-alkyl (preferably ^^4·alkyl), linear or scalloped C2 CV alkenyl (preferably alkenyl), or C ^C8—cycloalkyl, wherein the alkyl group, the county or the cycloalkyl group may be substituted with at least one basis group. In a specific embodiment of the invention, the ringing (4) is preferably independently the same or different straight chain. Or a branch ^^4 - a hospital base. In a specific embodiment of the present invention, the fluorinated quaternary ammonium compound may be tetramethylammonium fluoride, tetraethylfluorinated, tetrapropyl fluoride (10) or tetraradine Fluorine tilting, preferably tetramethyl gasification 132983.doc 201116651. The fluorine-containing four-stage used in the present invention The content of the ammonium compound is from about 〇·11 to about 5% by weight, preferably from about 0.2% by weight to about 3% by weight based on the total weight of the etchant composition. The oxidizing agent used in the present invention is used as an etching. The former initiator, for aluminum, titanium or aluminum titanium alloy in the titanium oxide composite metal layer, which may be various oxidants known in the art to be suitable for the titanium aluminum composite metal, such as, but not limited to, selected from The group consisting of nitric acid, perchloric acid, peroxide, or a salt thereof and mixtures thereof is preferably selected from the group consisting of nitric acid, ammonium nitrate, ammonium nitrate, perchloric acid, ammonium perchlorate, sodium perchlorate, a group consisting of potassium oxylate, ammonium peroxodisulfate, potassium peroxodisulfate, hydrogen peroxide, and mixtures thereof. The oxidizing agent used in the present invention is present in an amount of about 0.5% by weight based on the total weight of the etchant composition. Up to about 2% by weight, more preferably from % to about 1%. The acidic compound used in the present invention is a hydrogen fluoride buffer solution which can be formed with a fluorine-containing quaternary amine compound to dissolve aluminum oxide and titanium oxide in the titanium aluminum composite metal layer, which can be known in the art to be fluorine-containing The acidic compound from which the graded compound dissociates, such as, but not limited to, an acidic compound selected from the group consisting of sulfuric acid, hydrochloric acid, acetic acid, phosphoric acid, and mixtures thereof. The content of the acidic compound used in the invention is from about 0.2% by weight to about 2,000% by weight, more preferably from 5% to 10% by weight based on the total weight of the etchant composition, of the aqueous medium used in the present invention. It is well known to those of ordinary skill in the art, such as water, steamed water, ultrapure water, and deionized water, preferably ultrapure or deionized water. 132983.doc 201116651 The invention of the invention is used for the formation of a titanium-aluminum electronic circuit pattern. The taper angle of the titanium-aluminum composite metal layer having a fast surname rate and controllable etching is from about 20 degrees to about 60 degrees. The advantages between degrees. According to an embodiment of the present invention, the etchant composition of the present invention can be applied to a flat panel display, an integrated circuit, a flip chip package, a printed circuit board or a microelectromechanical device having a titanium aluminum composite metal layer structure. Applied in the etching process. According to the present invention, the present invention further provides a method for etching a titanium-aluminum composite metal layer, comprising: providing a substrate; forming a first titanium metal layer on the substrate; forming an aluminum metal layer on the first titanium metal layer; Forming a second titanium metal layer on the metal layer; forming a patterned photoresist layer on the second titanium metal layer; and using the patterned photoresist layer as a mask, using components and ratios as defined above The etchant composition etches the first titanium metal layer, the aluminum metal layer, and the second titanium metal layer. According to an embodiment of the present invention, in the etching method of the titanium aluminum composite gold layer of the present invention, the first titanium metal layer and the second titanium metal layer comprise 2 or a titanium alloy, and the aluminum metal layer comprises aluminum Or an alloy, and the method of forming the first titanium metal layer, the aluminum metal layer, and the second titanium metal layer may be known in the art - the ship method; ^ 1 , 舣 忐 仃 仃, for example but not limited to , physical vapor deposition, chemical vapor deposition or electro-recording. In the method of engraving in this month, there is no special (4) for the substrate containing the titanium alloy composite layer, such as but not limited to 1 substrate or glass substrate 132983.doc 201116651 plate, such as twinned or ceria glass substrate β The etching method of the titanium aluminum composite metal layer according to the present invention can be carried out under the general operating conditions conventionally known in the art. In one embodiment, the temperature of the etching method of the present invention ranges from about 丨5.匸 to about 5 〇. Preferably, it is from about 25 ° C to about 40 ° C; and the etching treatment time is from about 5 minutes to about 1 minute. The etching method of the invention can effectively etch the titanium-aluminum composite metal layer without causing damage to the surface of the crucible or the glass substrate, and can control the taper angle of the titanium metal composite layer after etching to about 2 to about Between 60 degrees. The following examples are intended to be illustrative of the present invention and are not intended to limit the scope of the present invention. Any modifications and variations that can be readily made by those skilled in the art are included in the disclosure of the present specification and the scope of the appended claims. Within the scope. EXAMPLES Fig. 1 is a side view showing a titanium aluminum composite metal layer and a patterned photoresist layer formed on a glass substrate before the last name (a) and the last name (b). As shown in Fig. 1(a), a glass substrate (1) is provided, and a composite of 7〇〇a titanium metal (2)/210〇A aluminum metal (3)/20〇A titanium metal (2) is formed on the substrate. a metal layer, followed by forming a patterned photoresist layer (4) on the titanium aluminum composite metal layer, and then dipping the substrate into the surname composition of Examples 1 to 14 of Table 1 at a temperature of about 35 ° C. After the etching was completed, the glass substrate was washed with ultrapure water and dried with nitrogen to obtain a titanium-aluminum composite metal layered substrate including the last name as shown in Fig. 1 (b). 132983.doc 201116651 Table 1 Example etchant composition (% by weight), the rest is water time (minutes) Wire taper angle substrate damage 1 Tetramethylammonium fluoride: sulfuric acid: nitric acid = 0.6 : 1_0 : 3.0 2.0 25 No 2 Tetramethylammonium fluoride: sulfuric acid: nitric acid = 1.0 : 1.0 : 3.0 1.4 22 no 3 tetradecyl ammonium fluoride: sulfuric acid: nitric acid = 1.0 : 10 · 0 : 3.0 2.5 20 micro 4 tetramethylammonium fluoride : sulfuric acid: nitric acid = 3.0: 1.0: 3.0 0.5 20 micro 5 tetradecyl ammonium fluoride: hydrogen acid: nitric acid = 1.0 : 1.0 : 3_0 2.1 30 no 6 tetramethylammonium fluoride: acetic acid: nitric acid = 1.0 : 2.0 : 3.0 3.5 25 No 7 Tetramethylammonium fluoride: Acetic acid: Nitric acid = 1.0 : 2.0: 15.0 0.6 20 Micro S Tetramethylammonium fluoride: Acetic acid: Nitric acid = 1.0 : 15.0 : 3.0 1.1 22 Micro 9 Tetramethyl fluoride Ammonium: sulfuric acid: nitric acid: ammonium peroxodisulfate = 1.0 : 1.0 : 3.0 : 1.0 1.5 35 no 10 tetradecyl ammonium fluoride: sulfuric acid: nitric acid: ammonium peroxodisulfate = 1.0 : 1.0 : 3.0 : 2.0 1.6 63 No 11 Tetramethylammonium fluoride: sulfuric acid: hydrogen peroxide = 1.0 : 1.0 : 5.0 1.2 60 no 12 tetradecyl ammonium fluoride: sulfuric acid · hydrogen peroxide = 1.0 : 3.0 : 5.0 L4 48 No 13 Tetramethylammonium fluoride: sulfuric acid: argon peroxide = 1.0 : 3.0 : 10·0 L5 70 No 14 Tetramethylammonium fluoride: sulfuric acid: nitric acid: hydrogen peroxide = 1.0 : 1.0 : 3.0 :3.0 1,3 45 No. The shape of the etched titanium-aluminum composite metal layer was observed by a scanning electron microscope (SEM), wherein the SEM photograph of Example 1 is shown in FIG. 2, and the SEM photograph of Example 7 is shown in FIG. . In the etchant composition of the present invention, when the concentration of the fluorine-containing quaternary ammonium compound is less than about 5% by weight, no damage is caused to the crucible or the glass substrate; when the concentration of the fluorine-containing quaternary ammonium compound is higher than about 0.1% by weight When % is used, the etching ability to titanium or a titanium alloy can be increased, and the shape after etching is preferable. When the concentration of the oxidizing agent is higher than about 0.5% by weight, the etching of titanium or titanium alloy is faster, and the effect is better; when the content of the oxidizing agent is less than about 20% by weight, the photoresist is not damaged, and Used alone or in combination with other oxidizing agents to change the taper angle of the composite metal layer after the last name. In summary, the etchant composition and the etching method of the present invention can effectively etch the titanium-aluminum composite metal layer on the substrate by 132983.doc 201116651 without damage to the surface of the substrate and the photoresist, and is suitable for titanium. The aluminum electronic circuit pattern is formed, and has the advantages of a fast engraving rate and a controlled taper angle of the titanium-aluminum composite metal layer after etching to be between about 20 degrees and about 60 degrees. While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view showing a titanium-aluminum composite metal layer and a patterned photoresist layer formed on a glass substrate before (a) etching and after (b) etching. Fig. 2 is a photograph showing the shape of the etched IS composite metal layer in Example 1 by a scanning electron microscope. Fig. 3 is a photograph showing the shape of the titanium-based composite metal layer in Example 7 by a scanning electron microscope. [Description of component symbols] (1) Glass substrate (2) Titanium layer (3) Aluminum metal layer (4) Patterned photoresist layer 132983.doc -10-