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JP2007206712A - Active matrix liquid crystal display device - Google Patents

Active matrix liquid crystal display device Download PDF

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JP2007206712A
JP2007206712A JP2007059644A JP2007059644A JP2007206712A JP 2007206712 A JP2007206712 A JP 2007206712A JP 2007059644 A JP2007059644 A JP 2007059644A JP 2007059644 A JP2007059644 A JP 2007059644A JP 2007206712 A JP2007206712 A JP 2007206712A
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semiconductor layer
insulating layer
semiconductor
liquid crystal
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JP4117369B2 (en
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Ki-Hyun Lyu
基鉉 柳
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LG Display Co Ltd
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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]
    • H10D30/01—Manufacture or treatment
    • H10D30/021—Manufacture or treatment of FETs having insulated gates [IGFET]
    • H10D30/031—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT]
    • H10D30/0312—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT] characterised by the gate electrodes
    • H10D30/0316—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT] characterised by the gate electrodes of lateral bottom-gate TFTs comprising only a single gate
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D30/00—Field-effect transistors [FET]
    • H10D30/01—Manufacture or treatment
    • H10D30/021—Manufacture or treatment of FETs having insulated gates [IGFET]
    • H10D30/031—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT]
    • H10D30/0321—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT] comprising silicon, e.g. amorphous silicon or polysilicon
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D30/00—Field-effect transistors [FET]
    • H10D30/60—Insulated-gate field-effect transistors [IGFET]
    • H10D30/67—Thin-film transistors [TFT]
    • H10D30/6729—Thin-film transistors [TFT] characterised by the electrodes
    • H10D30/673—Thin-film transistors [TFT] characterised by the electrodes characterised by the shapes, relative sizes or dispositions of the gate electrodes
    • H10D30/6732—Bottom-gate only TFTs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D30/00—Field-effect transistors [FET]
    • H10D30/60—Insulated-gate field-effect transistors [IGFET]
    • H10D30/67—Thin-film transistors [TFT]
    • H10D30/674—Thin-film transistors [TFT] characterised by the active materials
    • H10D30/6741—Group IV materials, e.g. germanium or silicon carbide
    • H10D30/6743—Silicon
    • H10D30/6746—Amorphous silicon

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Thin Film Transistor (AREA)

Abstract

【課題】本発明はアクティブマトリクス方式液晶表示装置の薄膜トランジスタを製造するために使用される、多数のマスク工程を減らすことを目的とする。
【解決手段】特に、ソース、ドレイン電極１４３ａ，１４３ｂ、不純物がドープされた半導体層１３９、及び不純物がドープされない半導体層１３７を同時にパターニングする。又、ソース、ドレイン電極１４３ａ，１４３ｂを形成するために、保護絶縁層１４５をマスクとして用いて、前記ソース、ドレイン電極及び不純物ドープ半導体層を単一の工程(ａ single step)でエッチングする。従って、コストが低減し、歩留まりが向上する。
【選択図】 図１６An object of the present invention is to reduce a number of mask processes used for manufacturing a thin film transistor of an active matrix liquid crystal display device.
In particular, source and drain electrodes 143a and 143b, a semiconductor layer 139 doped with impurities, and a semiconductor layer 137 not doped with impurities are simultaneously patterned. In addition, in order to form the source / drain electrodes 143a and 143b, the source / drain electrodes and the impurity-doped semiconductor layer are etched in a single step using the protective insulating layer 145 as a mask. Therefore, cost is reduced and yield is improved.
[Selection] FIG.

Description

本発明はアクティブマトリクス方式液晶表示装置に関する。   The present invention relates to an active matrix liquid crystal display device.

一般のアクティブマトリクス液晶表示装置（以下には、「ＡＭＬＣＤ」と称する）には、各々画素の駆動及び制御のため、スイッチング素子として薄膜トランジスタ（以下には、「ＴＦＴ」と称する）のような能動素子が用いられている。
図１のようにＴＦＴアレイを具備した一般の液晶表示装置は、透明ガラス基板上に大略長方形の画素電極４７が行、列で近接して配列されている。ゲートバス配線（アトレスライン）１３は画素電極４７の各行配列に沿って近接して形成されており、ソースバス配線（データライン）１４は画素電極４７の各列配列に沿って近接して形成されている。 In a general active matrix liquid crystal display device (hereinafter referred to as “AMLCD”), an active element such as a thin film transistor (hereinafter referred to as “TFT”) is used as a switching element for driving and controlling each pixel. Is used.
In a general liquid crystal display device having a TFT array as shown in FIG. 1, pixel electrodes 47 having a substantially rectangular shape are arranged close to each other in rows and columns on a transparent glass substrate. The gate bus lines (atres lines) 13 are formed close to each other along the row arrangement of the pixel electrodes 47, and the source bus lines (data lines) 14 are formed close to each other along the column arrangement of the pixel electrodes 47. Has been.

図２は図１の液晶表示素子の一部の拡大平面図であり、透明ガラス基板（図示せず）上にゲート電極の形成部３３（図３）を有するゲートバス配線１３が形成されている。絶縁層３５（図４参照）が前記ゲートバス配線１３及びゲート電極３３を覆い、該絶縁層上にゲートバス配線１３と交差する多数の平行なソースバス配線１４が形成されている。又、前記ゲートバス配線１３とソースバス電極１４の交差部の近傍に、半導体層３７（図４参照）が該ゲートバス配線及びゲート電極を覆っている絶縁層上に形成されている。該半導体層上にソース電極４３ａ及びゲート電極４３ｂが対向するように互いに離間して形成されて、能動素子としてのＴＦＴが構成される。   FIG. 2 is an enlarged plan view of a part of the liquid crystal display element of FIG. 1, in which a gate bus wiring 13 having a gate electrode forming portion 33 (FIG. 3) is formed on a transparent glass substrate (not shown). . An insulating layer 35 (see FIG. 4) covers the gate bus wiring 13 and the gate electrode 33, and a number of parallel source bus wirings 14 intersecting the gate bus wiring 13 are formed on the insulating layer. A semiconductor layer 37 (see FIG. 4) is formed on an insulating layer covering the gate bus line and the gate electrode in the vicinity of the intersection of the gate bus line 13 and the source bus electrode 14. On the semiconductor layer, the source electrode 43a and the gate electrode 43b are formed so as to be opposed to each other, thereby forming a TFT as an active element.

従来のＡＭＬＣＤの製造方法について、図２の２−２線に沿って切断した切断面である図３〜図７を参照して説明する。   A conventional AMLCD manufacturing method will be described with reference to FIGS. 3 to 7, which are cut surfaces taken along line 2-2 of FIG.

透明ガラス基板３１上に第１金属層を被着した後、パターニングを行ってゲートバス配線１３の拡張部であるゲート電極３３を形成する（図３）。
基板の全面にＳｉＮｘから成る第１絶縁層（ゲート絶縁層）３５と、ａ−Ｓｉから成る半導体層３７及びＳｉＮｘから成る第２絶縁層とを順次被着する。
図４に示すように、前記第２絶縁層のパターニングを行ってエッチストッパ４０を形成し、ｎ+型ａ−Ｓｉから成る不純物がドープされた半導体３９層を基板の全面に被着した後、該不純物半導体層３９と半導体層３７とを同時にパターニングする（図５）。 After the first metal layer is deposited on the transparent glass substrate 31, patterning is performed to form a gate electrode 33 that is an extended portion of the gate bus wiring 13 (FIG. 3).
A first insulating layer (gate insulating layer) 35 made of SiNx, a semiconductor layer 37 made of a-Si, and a second insulating layer made of SiNx are sequentially deposited on the entire surface of the substrate.
As shown in FIG. 4, the second insulating layer is patterned to form an etch stopper 40, and a semiconductor 39 layer doped with an impurity made of n + -type a-Si is deposited on the entire surface of the substrate. The impurity semiconductor layer 39 and the semiconductor layer 37 are simultaneously patterned (FIG. 5).

第２金属層４３が次に前記基板の全面に被着され、その後、第２金属層をパターニングして、ソースバス配線及びソースバス配線から分岐するソース電極４３ａと、ドレイン電極４３ｂとを形成する。次に、図６に示すように、前記ソース、ドレイン電極をマスクとして用いて不純物半導体層３９の露出されている部分をエッチングする。   A second metal layer 43 is then deposited on the entire surface of the substrate, and then the second metal layer is patterned to form a source electrode wiring 43a, a source electrode 43a branched from the source bus wiring, and a drain electrode 43b. . Next, as shown in FIG. 6, the exposed portion of the impurity semiconductor layer 39 is etched using the source and drain electrodes as a mask.

第１絶縁層と前記ソース電極４３ａ及びドレイン電極４３ｂが形成されている基板全面に窒化シリコン層を被着して保護絶縁層４５を形成する。次に保護絶縁層をエッチングしてコンタクトホ−ルを形成する。続いて、前記基板の全面の絶縁保護層上にスパッタリング法でＩＴＯ層を被着して、前記ＩＴＯ層をパターニングして画素電極４７を形成する。画素電極はコンタクトホ−ルを通じてドレイン電極４３ｂと電気的に接触する（図７）。   A protective insulating layer 45 is formed by depositing a silicon nitride layer on the entire surface of the substrate on which the first insulating layer and the source electrode 43a and drain electrode 43b are formed. Next, the protective insulating layer is etched to form a contact hole. Subsequently, an ITO layer is deposited on the insulating protective layer on the entire surface of the substrate by a sputtering method, and the ITO layer is patterned to form a pixel electrode 47. The pixel electrode is in electrical contact with the drain electrode 43b through the contact hole (FIG. 7).

従来のＴＦＴの製造方法は、非常に複雑である。また、ＡＭＬＣＤの各々パターン形成の工程においては、マスクパターンの形成、正確なパターニングを行うための高度のマスクの位置合わせ、フォトレジストの塗布及び現象等の工程で時間がたくさん必要であり、又、不良の発生で歩留まりの低減等の問題点がある。   The conventional TFT manufacturing method is very complicated. In addition, each pattern formation process of AMLCD requires a lot of time in processes such as mask pattern formation, advanced mask alignment for accurate patterning, photoresist application and phenomenon, etc. There are problems such as yield reduction due to the occurrence of defects.

本発明はＡＭＬＣＤの製造工程で第２金属層と半導体層との同時パターニングを行い、パターン形成のためのマスク工程の数を減らすことを目的とする。又、保護絶縁層をマスクとして用いて第２金属層と不純物半導体層とを同時にエッチングしてソース電極及びドレイン電極を形成する。   It is an object of the present invention to reduce the number of mask processes for forming a pattern by simultaneously patterning a second metal layer and a semiconductor layer in an AMLCD manufacturing process. Further, the second metal layer and the impurity semiconductor layer are simultaneously etched using the protective insulating layer as a mask to form a source electrode and a drain electrode.

特に、前述した目的を達成するために本発明は、次の方法で製造する。透明ガラス基板上に第１金属層を被着した後、パターニングしてゲートバス配線及びゲート電極を形成する。前記ゲートバス配線及びゲート電極が形成された前記透明ガラス基板上に第１絶縁層、半導体層及び第２絶縁層を順次被着する。前記第２絶縁層をパターニングしてエッチストッパを形成し、前記エッチストッパ及び前記半導体層上に不純物ドープの半導体層を被着する。前記不純物ドープの半導体層上に第２金属層を被着し、前記第２金属層、不純物半導体層及び半導体層をパターニングする。   In particular, in order to achieve the above-mentioned object, the present invention is manufactured by the following method. After depositing the first metal layer on the transparent glass substrate, patterning is performed to form gate bus lines and gate electrodes. A first insulating layer, a semiconductor layer, and a second insulating layer are sequentially deposited on the transparent glass substrate on which the gate bus wiring and the gate electrode are formed. The second insulating layer is patterned to form an etch stopper, and an impurity-doped semiconductor layer is deposited on the etch stopper and the semiconductor layer. A second metal layer is deposited on the impurity-doped semiconductor layer, and the second metal layer, the impurity semiconductor layer, and the semiconductor layer are patterned.

パターニングされた第２金属層と第１絶縁層上に保護絶縁層を被着する。前記保護絶縁層のパターニングを行ってコンタクトホールを形成し、前記エッチストッパ上の第２金属層の一部を露出させる。前記露出された第２金属層及び保護絶縁層上に透明導電膜を形成する。前記コンタクトホールを通じて第２金属層と電気的に接続するように前記導電膜をパターニングして画素電極を形成する。そして、前記保護絶縁層をマスクとして用いて、前記第２金属層の一部と、不純物半導体層の一部とをエッチングして、ソース電極とドレイン電極とを形成する。   A protective insulating layer is deposited on the patterned second metal layer and first insulating layer. The protective insulating layer is patterned to form a contact hole, and a part of the second metal layer on the etch stopper is exposed. A transparent conductive film is formed on the exposed second metal layer and protective insulating layer. The conductive film is patterned to form a pixel electrode so as to be electrically connected to the second metal layer through the contact hole. Then, using the protective insulating layer as a mask, a part of the second metal layer and a part of the impurity semiconductor layer are etched to form a source electrode and a drain electrode.

従って、本発明によるＡＭＬＣＤは、透明ガラス基板と、該透明ガラス基板上に形成されたゲートバス配線及びゲート電極と、該ゲートバス配線とゲート電極が形成されている基板上に形成されたゲート絶縁層と、該ゲート絶縁層上に形成された半導体層と、前記半導体層の一部分上に形成されたエッチストッパと、前記エッチストッパ上に二領域に分離された前記半導体層に形成され、不純物半導体層と、分離されて形成された前記不純物半導体層上の各部分に形成されたソース電極及びドレイン電極と、前記ソース電極及びドレイン電極上に形成され、コンタクトホールを有する保護絶縁層と、前記コンタクトホールを通じて前記ドレイン電極に電気的に接続され、前記保護絶縁層上に形成された画素電極とから成る構造を有する。   Accordingly, the AMLCD according to the present invention includes a transparent glass substrate, a gate bus wiring and a gate electrode formed on the transparent glass substrate, and a gate insulation formed on the substrate on which the gate bus wiring and the gate electrode are formed. A semiconductor layer formed on the gate insulating layer; an etch stopper formed on a portion of the semiconductor layer; and an impurity semiconductor formed in the semiconductor layer separated into two regions on the etch stopper. A source electrode and a drain electrode formed in each part on the impurity semiconductor layer formed separately, a protective insulating layer formed on the source electrode and the drain electrode and having a contact hole, and the contact The pixel electrode is electrically connected to the drain electrode through a hole and formed on the protective insulating layer.

本発明は第２金属層、不純物半導体層及び半導体層を一つの工程で同時にパターニングするので、製造コストが低減され、製造の時間が短縮される。又、ソース電極及びドレイン電極を付加的なマスク工程を必要とすることなく、単一の工程で形成することができる。それ故、歩留まりが向上する。   In the present invention, since the second metal layer, the impurity semiconductor layer, and the semiconductor layer are simultaneously patterned in one process, the manufacturing cost is reduced and the manufacturing time is shortened. Further, the source electrode and the drain electrode can be formed in a single process without requiring an additional mask process. Therefore, the yield is improved.

以下、本発明のＡＭＬＣＤの製造方法の実施の形態を図面を参照して説明する。
まず、透明ガラス基板１３１の一面にＡｌ、又は、Ａｌ系合金のＡｌ−Ｐｄ、Ａｌ−Ｓｉ、Ａｌ−Ｓｉ−Ｔｉ、Ａｌ−Ｓｉ−Ｃｕ等から成る第１金属層をスパッタリング法で被着する。写真食刻法で第１金属層を選択的にエッチングしてゲート電極１３３を形成する（図８）。
もし必要であれば、耐化学性、耐熱性、特に、続いて形成するゲート絶縁層との接着性等の向上のため、ゲート電極１３３を陽極酸化させ、陽極酸化層を形成するようにしてもよい。該陽極酸化層は続いて形成されるゲート絶縁層の窒化シリコンと共に絶縁層として機能してゲート電極１３３と近接の信号線間の電気的絶縁性を向上させる役割を果たす。 Embodiments of an AMLCD manufacturing method according to the present invention will be described below with reference to the drawings.
First, a first metal layer made of Al or an Al-based alloy of Al—Pd, Al—Si, Al—Si—Ti, Al—Si—Cu, or the like is deposited on one surface of the transparent glass substrate 131 by a sputtering method. . The gate electrode 133 is formed by selectively etching the first metal layer by photolithography (FIG. 8).
If necessary, the gate electrode 133 may be anodized to form an anodized layer in order to improve chemical resistance, heat resistance, in particular, adhesion to the gate insulating layer to be formed subsequently. Good. The anodized layer functions as an insulating layer together with silicon nitride of the gate insulating layer to be subsequently formed, and plays a role of improving electrical insulation between the gate electrode 133 and the adjacent signal line.

ゲート電極が形成された前記透明ガラス基板１３１上に第１絶縁層（ゲート絶縁層）１３５、不純物がドープされていないａ-Ｓｉ半導体層１３７及び窒化シリコンから成る第２絶縁層１４０を順次被着する（図９）。   A first insulating layer (gate insulating layer) 135, a non-doped a-Si semiconductor layer 137, and a second insulating layer 140 made of silicon nitride are sequentially deposited on the transparent glass substrate 131 on which the gate electrode is formed. (FIG. 9).

図１０から分かるように、第２絶縁層をエッチングしてエッチストッパ１４０を形成し、エッチストッパ１４０及び半導体層１３７上にプラスマＣＶＤ装置で水素ガス及びホスフィンガスを使って、Ｎ+半導体層１３９を被着する（図１１）。 As can be seen from FIG. 10, an etch stopper 140 is formed by etching the second insulating layer, and an N + semiconductor layer 139 is formed on the etch stopper 140 and the semiconductor layer 137 using hydrogen gas and phosphine gas with a plasma CVD apparatus. It adheres (FIG. 11).

続いて、図１２に示すように、Ｐｄ、Ａｌ−Ｓｉ、Ａｌ−Ｓｉ−Ｔｉ及びＡｌ−Ｓｉ−Ｃｕのいずれかの一つの金属から成る第２金属層１４３をスパッタリング法で被着し、次に第２金属層１４３上に感光膜（図示せず）を塗布する。そして感光膜の選択された部分を露光し、現象して、第２金属層１４３の選択された部分を露出する。次に、前記現象されたパターンで、第２金属層１４３、Ｎ+半導体層１３９及び半導体層１３７を除去する。図１３ように、第２金属層１４３、Ｎ+半導体層１３９及び半導体層１３７は所望の形態にパターニングされる。 Subsequently, as shown in FIG. 12, a second metal layer 143 made of one of Pd, Al—Si, Al—Si—Ti, and Al—Si—Cu is deposited by a sputtering method. A photosensitive film (not shown) is applied on the second metal layer 143. Then, the selected portion of the photosensitive film is exposed to cause a phenomenon, and the selected portion of the second metal layer 143 is exposed. Next, the second metal layer 143, the N + semiconductor layer 139, and the semiconductor layer 137 are removed using the phenomenon described above. As shown in FIG. 13, the second metal layer 143, the N + semiconductor layer 139, and the semiconductor layer 137 are patterned into a desired form.

ゲート絶縁層１３５及びパターニングされた第２金属層１４３の上にプラスマＣＶＤ装置でアンモニアガス、シランガス、水素ガスを使って、窒化珪素層から成る保護絶縁層１４５を被着する。
そして、エッチストッパ１４０上の開口と、第２金属層１４３の一部分が露出するコンタクトホールを形成するように保護絶縁層１４５をパターニングする（図１４）。 A protective insulating layer 145 made of a silicon nitride layer is deposited on the gate insulating layer 135 and the patterned second metal layer 143 using a plasma CVD apparatus using ammonia gas, silane gas, or hydrogen gas.
Then, the protective insulating layer 145 is patterned so as to form an opening on the etch stopper 140 and a contact hole in which a part of the second metal layer 143 is exposed (FIG. 14).

図１５に示すように、画素電極１４７を形成する。そして、パターニングによりコンタクトホールを通じて第２金属層１４３とが電気的に接続するようにコンタクトホールの中と保護絶縁層１４５上にＩＴＯ層を被着する。
そして、図１６に示されるように、保護絶縁層１４５をマスクとして用いて、露出された第２金属層の部分１４３とＮ+半導体層１３９とをエッチングして、ソース電極１４３ａとドレイン電極１４３ｂを形成する。
前記第２金属層１４３とＮ+半導体層１３９のエッチングの前に、保護絶縁層１４５にコンタクトホールを形成して、その後に前記画素電極１４７を形成する理由は、前記画素電極１４７は、コンタクトホールを介して露出された第２金属層１４３をエッチングされることを防ぐ役割をするためである。従って、製造工程の順序が重要である。それで、第２金属層１４３及びＮ+半導体層１３９は単一の工程でエッチングされる。これに対して、前記の従来の工程によると、エッチングストッパ１４０上に形成される各層は各々別々の工程でエッチングされる。 As shown in FIG. 15, the pixel electrode 147 is formed. Then, an ITO layer is deposited in the contact hole and on the protective insulating layer 145 so as to be electrically connected to the second metal layer 143 through the contact hole by patterning.
Then, as shown in FIG. 16, using the protective insulating layer 145 as a mask, the exposed portion 143 of the second metal layer and the N + semiconductor layer 139 are etched to form the source electrode 143a and the drain electrode 143b. Form.
The reason why the contact hole is formed in the protective insulating layer 145 before the etching of the second metal layer 143 and the N + semiconductor layer 139 and then the pixel electrode 147 is formed is that the pixel electrode 147 is a contact hole. This is to prevent the second metal layer 143 exposed through the etching from being etched. Therefore, the order of the manufacturing process is important. Therefore, the second metal layer 143 and the N + semiconductor layer 139 are etched in a single process. On the other hand, according to the conventional process, each layer formed on the etching stopper 140 is etched in a separate process.

上述した方法で製造されたＡＭＣＬＤは、以下に述べる構造を有している。透明ガラス基板１３１上に形成されたゲートバス配線及びゲート電極１３３と、該ゲートバス配線及びゲート電極１３３が形成されている基板上に形成されたゲート絶縁層１３５と、該ゲート絶縁層１３５上に形成された半導体層１３７と、半導体層１３７上のゲート電極１３３の位置に合わせて形成されたエッチストッパ１４０と、エッチストッパ１４０及び半導体層１３７の各々を覆う二領域に離間した不純物Ｎ+半導体層１３９と、前記不純物Ｎ+半導体層１３９の一領域上に形成されたソース電極１４３ａと、他の一領域上に形成されたドレイン電極１４３ｂと、前記ゲート絶縁層、ソース電極１４３ａ及びドレイン電極１４３ｂを覆っている保護絶縁層と、前記保護絶縁層上のコンタクトホールを通じてドレイン電極１４３ｂと電気的に接続されている画素電極１４７と、から成る構造である。 The AMCLD manufactured by the method described above has the structure described below. A gate bus wiring and gate electrode 133 formed on the transparent glass substrate 131, a gate insulating layer 135 formed on the substrate on which the gate bus wiring and gate electrode 133 are formed, and on the gate insulating layer 135 The formed semiconductor layer 137, the etch stopper 140 formed in accordance with the position of the gate electrode 133 on the semiconductor layer 137, and the impurity N + semiconductor layer separated in two regions covering each of the etch stopper 140 and the semiconductor layer 137 139, a source electrode 143a formed on one region of the impurity N + semiconductor layer 139, a drain electrode 143b formed on another region, the gate insulating layer, the source electrode 143a, and the drain electrode 143b. The drain electrode 143b is electrically connected to the protective insulating layer covering the contact insulating layer and the contact hole on the protective insulating layer. The pixel electrode 147 is connected to each other.

もし、ここで第２絶縁層１４０が形成されてない場合には、半導体層１３９は、開口を通じて露出されて、コンタクト物質から保護されない。それで、半導体層１３９との粘着性が良い酸化シリコンあるいは窒化シリコンで第２絶縁層１４０を形成するため、前記第２絶縁膜は、エッチストッパ及び半導体層１３９の保護膜の役割をする。   If the second insulating layer 140 is not formed here, the semiconductor layer 139 is exposed through the opening and is not protected from the contact material. Therefore, since the second insulating layer 140 is formed of silicon oxide or silicon nitride having good adhesion to the semiconductor layer 139, the second insulating film serves as an etch stopper and a protective film for the semiconductor layer 139.

液晶表示装置の回路図。The circuit diagram of a liquid crystal display device. 液晶表示装置の一部を示す拡大平面図。FIG. 3 is an enlarged plan view showing a part of a liquid crystal display device. 従来の液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the conventional liquid crystal display device. 従来の液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the conventional liquid crystal display device. 従来の液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the conventional liquid crystal display device. 従来の液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the conventional liquid crystal display device. 従来の液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the conventional liquid crystal display device. 本発明の実施形態による液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the liquid crystal display device by embodiment of this invention. 本発明の実施形態による液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the liquid crystal display device by embodiment of this invention. 本発明の実施形態による液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the liquid crystal display device by embodiment of this invention. 本発明の実施形態による液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the liquid crystal display device by embodiment of this invention. 本発明の実施形態による液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the liquid crystal display device by embodiment of this invention. 本発明の実施形態による液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the liquid crystal display device by embodiment of this invention. 本発明の実施形態による液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the liquid crystal display device by embodiment of this invention. 本発明の実施形態による液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the liquid crystal display device by embodiment of this invention. 本発明の実施形態による液晶表示装置の製造工程を示す断面図。Sectional drawing which shows the manufacturing process of the liquid crystal display device by embodiment of this invention.

符号の説明Explanation of symbols

１３ ゲートバス配線
１４ ソース配線
３１、１３１ 透明ガラス基板
３３、１３３ ゲート電極
３５、１３５ 第１絶縁層
３７、１３７ 半導体層
３９、１３９ 不純物半導体層
４０、１４０ エッチストッパ
４３、１４３ 第２金属層
４３ａ、１４３ａ ソース電極
４３ｂ、１４３ｂ ドレイン電極
４５、１４５ 保護絶縁層
４７、１４７ 画素電極 13 Gate bus wiring 14 Source wiring 31, 131 Transparent glass substrate
33, 133 Gate electrode 35, 135 First insulating layer 37, 137 Semiconductor layer 39, 139 Impurity semiconductor layer 40, 140 Etch stopper 43, 143 Second metal layer 43a, 143a Source electrode 43b, 143b Drain electrode 45, 145 Protective insulation Layer 47, 147 Pixel electrode

Claims (7)

基板と、
前記基板上にエッジ部を有する第１半導体層と、
前記第１半導体層上に、前記第１半導体層のエッジ部と大略一致するエッジ部を有する不純物を含む第２半導体層と、
前記第２半導体層上に、前記第２半導体層のエッジ部と大略一致するエッジ部を有する金属層と、
前記第１半導体層と前記第２半導体層と前記金属層とを被覆する保護絶縁層と、
前記保護絶縁層に形成された第１開口と第２開口と、
前記保護絶縁層上に、前記第１開口を通じて前記金属層と接触するように形成された透明導電層と、
前記保護絶縁層を貫通する前記第２開口を通じて前記金属層と前記第２半導体層をエッチングすることで形成した半導体装置のソースおよびドレイン領域と、
から構成されることを特徴とする半導体装置。 A substrate,
A first semiconductor layer having an edge on the substrate;
A second semiconductor layer including an impurity having an edge portion approximately coincident with an edge portion of the first semiconductor layer on the first semiconductor layer;
On the second semiconductor layer, a metal layer having an edge portion that approximately matches the edge portion of the second semiconductor layer;
A protective insulating layer covering the first semiconductor layer, the second semiconductor layer, and the metal layer;
A first opening and a second opening formed in the protective insulating layer;
A transparent conductive layer formed on the protective insulating layer so as to be in contact with the metal layer through the first opening;
Source and drain regions of a semiconductor device formed by etching the metal layer and the second semiconductor layer through the second opening penetrating the protective insulating layer;
A semiconductor device comprising: 前記第１半導体層は実質的に不純物がドープされていない半導体層であることを特徴とする、請求項１記載の半導体装置。   The semiconductor device according to claim 1, wherein the first semiconductor layer is a semiconductor layer substantially not doped with impurities. 前記基板上に形成されたゲート電極と、
前記ゲート電極上に形成されたゲート絶縁層と、が形成されたことを特徴とする、請求項１記載の半導体装置。 A gate electrode formed on the substrate;
The semiconductor device according to claim 1, further comprising: a gate insulating layer formed on the gate electrode. エッチストッパが前記第１半導体層と第２半導体層との間に、形成されていることを特徴とする、請求項１記載の半導体装置。   2. The semiconductor device according to claim 1, wherein an etch stopper is formed between the first semiconductor layer and the second semiconductor layer. 前記絶縁保護層の前記第１開口は前記エッチストッパと実質的に位置合わせされたことを特徴とする、請求項４記載の半導体装置。   The semiconductor device according to claim 4, wherein the first opening of the insulating protective layer is substantially aligned with the etch stopper. 前記透明導電層は透明電極であり、前記絶縁保護層の前記第２開口を通じて前記金属層と電気的に接触することを特徴とする、請求項１記載の半導体装置。   The semiconductor device according to claim 1, wherein the transparent conductive layer is a transparent electrode and is in electrical contact with the metal layer through the second opening of the insulating protective layer. 前記透明電極は透明導電物質を含むことを特徴とする、請求項６記載の半導体装置。   The semiconductor device according to claim 6, wherein the transparent electrode includes a transparent conductive material.
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