KR950000654B1 - Self-alignment method tft gate metal layer - Google Patents

Self-alignment method tft gate metal layer Download PDF

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KR950000654B1
KR950000654B1 KR1019880012854A KR880012854A KR950000654B1 KR 950000654 B1 KR950000654 B1 KR 950000654B1 KR 1019880012854 A KR1019880012854 A KR 1019880012854A KR 880012854 A KR880012854 A KR 880012854A KR 950000654 B1 KR950000654 B1 KR 950000654B1
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metal layer
pattern
thin film
source
film transistor
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KR900005559A (en
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허창우
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주식회사 금성사
최근선
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/18Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
    • H01L21/28Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

GATE METAL LAYER OF THIN FILM TRANSISTOR The method includes the processes of; depositing Cr (22) on a glass plate (21) with vapor, depositing SiN (23), a-Si:H (24), and SiO2 (25) on the Cr (22) with vapor, coating positive photo registers (25), forming a pattern, etching SiO2 (25) selectively, depositing AL (27) with vapor, depositing source and drain metal layer with vapor, and lifting off the positive photo register (26).

Description

박막트랜지스터의 게이트 금속층에 의한 소오스, 드레인 패턴자체 정렬방법Source and drain pattern self-alignment method by gate metal layer of thin film transistor

제 1a 도 내지 1e 도는 종래 박막트랜지스터의 소오스, 드레인 제조순서를 보인 공정도,1a to 1e is a process chart showing the source, drain manufacturing procedure of a conventional thin film transistor,

제 2a 도 내지 2g 도는 본 발명 박막트랜지스터의 소오스, 드레인 제조순서를 보인 공정도.2a to 2g is a process chart showing the source, drain manufacturing procedure of the thin film transistor of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1,21 : 유리판 2,22 : Cr1,21: glass plate 2,22: Cr

3 : a-SiN 4,24 : a-Si : H3: a-SiN 4,24: a-Si: H

5 : n+a-Si : H 6,25 : SiO2 5: n + a-Si: H 6,25: SiO 2

7,21 : Al 23 : SiN7,21: Al 23: SiN

26 : 포지티브포토레지스트26: positive photoresist

본 발명은 박막트랜지스터의 공정에 관한 것으로, 특히 게이트금속층(gate metal)인 Cr을 이용하여, 소오스, 드레인을 자체정렬(Self-alignment)함으로써 포토리쏘그라피(Photo lethography)의 마스크스텝(mask step)을 줄이는데 적당하도록 한 박막트랜지스터의 게이트 금속층에 의한 소오스, 드레인 패턴(pattern)자체 정렬 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process for thin film transistors, and in particular, a mask step of photo lethography by self-aligning a source and a drain using Cr as a gate metal layer. A method of self-aligning a source and a drain pattern by a gate metal layer of a thin film transistor, which is suitable for reducing the number of transistors.

일반적으로 박막트랜지스터는 액정칼라티브이(TV)에 있어서, 각 화소의 하나하나에 형성된 후 각 화소를 구동시켜 주는 역할을 하는 것으로, 게이트에 가해준 전압에 따라 소오스와 드레인이 턴온, 턴오프되어 스위칭되면서 각 화소를 조정하게 된다.In general, a thin film transistor is formed in one of each pixel and drives each pixel. The source and the drain are turned on and off depending on the voltage applied to the gate. As you adjust each pixel.

여기서 박막트랜지스터는 각 화소 하나하나를 정확하게 조정해야 하고 가해진 빛에 의해 영향을 크게받지 않아야 하기 때문에 주로 역스태거(inverter stagger)형 박막트랜지스터를 사용한다.The thin film transistors mainly use inverter stagger type thin film transistors because each pixel must be precisely adjusted and must not be greatly affected by the applied light.

이와같은 점을 감안한 종래 박막트랜지스터의 소오스, 드레인 제조공정은 제 1a 도에 도시한 바와같이, 유리판(1)전면에 Cr(2)을 증착한 후 포토레지스트(photo resist)를 입혀 패턴(pattern)을 형성하고, 제 1b 도에 도시한 바와같이, 상기 Cr패턴(2)위에 a-SiN(3) a-Si : H(4), n+a-Si : H(5)층을 증착하고, 제 1c 도에 도시한 바와같이, 포토레지스트를 입혀 패턴을 형성하고, 제 1d 도에 도시한 바와같이, 전면에 패시베이션(passivation)용 SiO2(6)을 증착한 후 패턴을 형성하고, 제 1e 도에 도시한 바와같이, 전면에 Al(7)층을 입힌 후 소오스, 드레인접촉(Contact) 패턴을 형성한다.In view of the above, the source and drain manufacturing processes of the conventional thin film transistor are formed by depositing Cr (2) on the entire surface of the glass plate 1 and then applying a photoresist as shown in FIG. 1A. As shown in FIG. 1B, a-SiN (3) a-Si: H (4), n + a-Si: H (5) layers are deposited on the Cr pattern 2, As shown in FIG. 1C, a pattern is formed by coating a photoresist, and as shown in FIG. 1D, after deposition of SiO 2 (6) for passivation on the entire surface, a pattern is formed. As shown in the figure, an Al (7) layer is coated on the entire surface to form a source and drain contact pattern.

여기서 게이트 금속층으로 사용되는 상기 Cr 패턴에 있어서는 유리(1)위에 증착된 Cr(2)위에 포토레지스트를 바른 후 소프트베이크(Soft bake)를 거치고, 게이트 마스크 1장을 사용하여 얼라이너(aligner)로서 표출한다.In the Cr pattern used as the gate metal layer, a photoresist is applied on Cr (2) deposited on the glass (1), followed by a soft bake, and used as an aligner using one gate mask. Express.

이와동시에 표출된 얼라이너가 디벨러프(develop), 하드베이크(hard bake)를 거친 후 Cr에칭기에 넣어 Cr 게이트 패턴을 형성하고, 포토레지스트를 제거한다.At the same time, the aligner expressed at the same time passes through a developer, hard bake, and is placed in a Cr etching machine to form a Cr gate pattern, and then remove the photoresist.

이와같이된 포토리쏘그라피공정이 상기 n+a-Si : H(5), 소오스 및 드레인 패턴형성이 개개의 마스크를 만들어 패턴을 만들어야 하므로 공정이 복잡해질 뿐아니라 수율(Yield)에 있어서도 좋지않게 되고, 제조단가가 높아지게 되는 문제점이 있었다.This photolithography process is not only complicated, but also not good yield (Yield), because the n + a-Si: H (5), source and drain pattern formation must be made to make a pattern by making individual masks, There was a problem that the manufacturing cost increases.

본 발명은 이와같은 종래의 문제점을 해결하기 위해 역스태거형 박막트랜지스터에 있어서 Cr 게이트 패턴이 마스크 역할을 하여 포토레지스트를 감광시킨 후 소오스, 드레인 패턴을 형성시킴으로써 포토리쏘그라피 공정의 마스크 공정을 줄이도록 한 박막트랜지스터의 게이트 금속층에 의한 소오스, 드레인 패턴자체 정렬방법을 창안한 것으로, 이를 첨부한 도면에 의해 상세히 설명하면 다음과 같다.The present invention is to reduce the mask process of the photolithography process by forming a source, drain pattern after the photoresist is exposed to the photoresist Cr as a mask in the reverse staggered thin film transistor in order to solve such a conventional problem Invented a method of aligning the source and drain patterns by the gate metal layer of a thin film transistor, which will be described in detail with reference to the accompanying drawings.

제 2a 도 내지 2g 도는 본 발명 박막트랜지스터의 소오스, 드레인 제조순서를 보인 공정도로서 이에 도시한 바와같이 (a)는 Cr(22) 패턴형성, (b)는 SiN(23), a-Si : H(24), SiO2(25) 층형성, (c)는 포지티브(positive) 포토레지스트(26)형성, (d)는 포지티브포토레지스트 패턴형성, (e)는 SiO2(25)에칭형성, (f)는 Al(27)증착, (g)는 포지티브포토레지스트(26)의 리프트오프(lift off)공정을 나타낸 것이다.2a to 2g are process diagrams showing the source and drain manufacturing procedures of the thin film transistor of the present invention, as shown in (a), Cr (22) pattern formation, (b) SiN (23), a-Si: H (24), SiO 2 (25) layer formation, (c) formation of positive photoresist 26, (d) formation of positive photoresist pattern, (e) formation of SiO 2 (25) etching, ( f) shows Al (27) deposition, (g) shows the lift off process of the positive photoresist 26.

이와같이 구성된 본 발명 역스태거 박막트랜지스터의 제조공정을 설명하면 다음과 같다. 유리판(21)위에 Cr(22)을 증착한 후 포토레지스트를 입혀 패턴을 형성하고, 제 2b 도에 도시한 바와같이, SiN(23), a-Si : H(24), SiO2(25)를 증착한다.The manufacturing process of the reverse staggered thin film transistor of the present invention configured as described above is as follows. After depositing Cr (22) on the glass plate 21, a photoresist is applied to form a pattern, and as shown in FIG. 2B, SiN (23), a-Si: H (24), and SiO 2 (25). Deposit.

그리고 제 2c 도에 도시한 바와같이, 상기 SiO2(25)위의 전면에 포지티브포토레지스트(26)를 도포시킨 후 상기 Cr(22) 게이트측의 반대편에서 얼라이너를 이용하여 빛을 조사하면, 포지티브포토레지스트(26)가 선택적으로 감광되며, 이의 샘플을 제거기(remover)에 넣으면, 제 2d 도에 도시한 바와같이, 포지티브포토레지스트(26) 패턴이 형성된다.As shown in FIG. 2C, after the positive photoresist 26 is applied to the entire surface of the SiO 2 25, the light is irradiated using an aligner on the opposite side of the gate of the Cr 22. The photoresist 26 is selectively photosensitive, and when its sample is placed in a remote, a positive photoresist 26 pattern is formed, as shown in FIG. 2D.

이때 다시 제 2e 도에 도시한 바와같이, SiO2(25)를 선택적으로 에칭하고, 제 2f 도에 도시한 바와같이, n+a-Si : H를 PECVD(Plasma Enhanced Chemical Vapor Desposition)로 증착한 후 Al(27)을 전자비임으로 증착하여 드레인, 소오스를 형성한다.At this time, as shown in FIG. 2E, SiO 2 25 is selectively etched, and as shown in FIG. 2F, n + a-Si: H is deposited by Plasma Enhanced Chemical Vapor Desposition (PECVD). After that, Al 27 is deposited with an electron beam to form a drain and a source.

이와같이 한 후 포토레지스트 제거기에 넣어 포지티브포토레지스트(26)를 리프트 오프시킴으로써 제 2f 도에 도시한 바와같은 역스태거 박막트랜지스터가 형성된다.After doing this, the positive photoresist 26 is lifted off by putting it in a photoresist remover to form an inverse staggered thin film transistor as shown in FIG. 2F.

따라서 Cr(22) 게이트 패턴이 마스크 역할을 하여 포토레지스트(26)를 선택적으로 감광시킨 후 소오스, 드레인의 패턴을 형성시킴으로써 게이트 Cr(22)패턴과 같은 형태로 채널이 형성되는 것이다.Therefore, the Cr 22 gate pattern serves as a mask to selectively photosensitive photoresist 26, and then forms a source and drain pattern to form a channel in the same form as the gate Cr 22 pattern.

이상에서 설명한 바와같이 본 발명은 Cr게이트 패턴이 마스크 역할을 하여 소오스, 드레인의 패턴을 형성시켜주므로 현재 액정구동형 칼라티브이에서 가장 널리 사용되고 있는 역스태거형 박막트랜지스터에 있어서, 공정상에 큰 비용을 차지하는 마스크수를 줄일 뿐만아니라 공정의 스텝을 간단하고 쉽게 만들어 실용성을 향상시킬 수 있는 효과가 있다.As described above, in the present invention, since the Cr gate pattern serves as a mask to form a source and a drain pattern, the present invention has a large cost in the process of the staggered thin film transistor which is most widely used in the liquid crystal driving type. In addition to reducing the number of masks occupied, there is an effect of improving the practicality by making the process steps simple and easy.

또한 소오스, 드레인의 접촉정렬을 확실하게 해줄 수 있는 효과가 있다.In addition, there is an effect that can ensure the contact alignment of the source and drain.

Claims (1)

유리판(21)위에 Cr(22)을 증착한 역스태거형 박막트랜지스터의 제조공정에 있어서, 상기 Cr(22)위에 SiN(23), a-Si : H(24), SiO2(25)를 증착하고, 포지티브포토레지스트(26)를 도포한 후 빛을 조사하여 패턴을 형성하고, 상기 SiO2(25)를 선택적으로 에칭하고 Al(27)을 증착하여 소오스, 드레인 금속층을 증착한 후 상기 포지티브포토레지스트(26)를 리프트 오프하는 것을 특징으로 한 박막트랜지스터의 게이트 금속층에 의한 소오스, 드레인 패턴자체 정렬방법.In the fabrication process of the reverse staggered thin film transistor in which Cr (22) is deposited on the glass plate (21), SiN (23), a-Si: H (24), and SiO 2 (25) are deposited on the Cr (22). After the positive photoresist 26 is applied, light is irradiated to form a pattern. The SiO 2 25 is selectively etched, and Al 27 is deposited to deposit a source and drain metal layer. A method of aligning the source and drain patterns by the gate metal layer of the thin film transistor, characterized in that the resist is lifted off.
KR1019880012854A 1988-09-30 1988-09-30 Self-alignment method tft gate metal layer KR950000654B1 (en)

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