TW201704831A - 薄膜電晶體結構 - Google Patents

薄膜電晶體結構 Download PDF

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TW201704831A
TW201704831A TW104124874A TW104124874A TW201704831A TW 201704831 A TW201704831 A TW 201704831A TW 104124874 A TW104124874 A TW 104124874A TW 104124874 A TW104124874 A TW 104124874A TW 201704831 A TW201704831 A TW 201704831A
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metal layer
film transistor
thin film
layer
width
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周凱茹
吳哲耀
賴谷皇
江宜達
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凌巨科技股份有限公司
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Priority to TW104124874A priority Critical patent/TW201704831A/zh
Priority to CN201510477137.0A priority patent/CN106409916A/zh
Priority to US14/932,215 priority patent/US20170033236A1/en
Publication of TW201704831A publication Critical patent/TW201704831A/zh

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
    • H01L29/76Unipolar devices, e.g. field effect transistors
    • H01L29/772Field effect transistors
    • H01L29/78Field effect transistors with field effect produced by an insulated gate
    • H01L29/786Thin film transistors, i.e. transistors with a channel being at least partly a thin film
    • H01L29/78645Thin film transistors, i.e. transistors with a channel being at least partly a thin film with multiple gate
    • H01L29/78648Thin film transistors, i.e. transistors with a channel being at least partly a thin film with multiple gate arranged on opposing sides of the channel
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/40Electrodes ; Multistep manufacturing processes therefor
    • H01L29/41Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
    • H01L29/423Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
    • H01L29/42312Gate electrodes for field effect devices
    • H01L29/42316Gate electrodes for field effect devices for field-effect transistors
    • H01L29/4232Gate electrodes for field effect devices for field-effect transistors with insulated gate
    • H01L29/42384Gate electrodes for field effect devices for field-effect transistors with insulated gate for thin film field effect transistors, e.g. characterised by the thickness or the shape of the insulator or the dimensions, the shape or the lay-out of the conductor
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/40Electrodes ; Multistep manufacturing processes therefor
    • H01L29/43Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
    • H01L29/49Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET
    • H01L29/4908Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET for thin film semiconductor, e.g. gate of TFT
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
    • H01L29/76Unipolar devices, e.g. field effect transistors
    • H01L29/772Field effect transistors
    • H01L29/78Field effect transistors with field effect produced by an insulated gate
    • H01L29/786Thin film transistors, i.e. transistors with a channel being at least partly a thin film
    • H01L29/78651Silicon transistors
    • H01L29/7866Non-monocrystalline silicon transistors
    • H01L29/78663Amorphous silicon transistors
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
    • H01L29/76Unipolar devices, e.g. field effect transistors
    • H01L29/772Field effect transistors
    • H01L29/78Field effect transistors with field effect produced by an insulated gate
    • H01L29/786Thin film transistors, i.e. transistors with a channel being at least partly a thin film
    • H01L29/78651Silicon transistors
    • H01L29/7866Non-monocrystalline silicon transistors
    • H01L29/78672Polycrystalline or microcrystalline silicon transistor
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
    • H01L29/76Unipolar devices, e.g. field effect transistors
    • H01L29/772Field effect transistors
    • H01L29/78Field effect transistors with field effect produced by an insulated gate
    • H01L29/786Thin film transistors, i.e. transistors with a channel being at least partly a thin film
    • H01L29/78696Thin film transistors, i.e. transistors with a channel being at least partly a thin film characterised by the structure of the channel, e.g. multichannel, transverse or longitudinal shape, length or width, doping structure, or the overlap or alignment between the channel and the gate, the source or the drain, or the contacting structure of the channel

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thin Film Transistor (AREA)

Abstract

本發明為一薄膜電晶體結構,其包含一基板、一第一金屬層、一第一緩衝層、一半導體層、一第二金屬層、一第二緩衝層以及一第三金屬層,該第二金屬層包含一間隔區,該半導體層包含一通道區,而本發明藉由該第一金屬層以及第三金屬層產生雙閘極,藉由雙閘極結構夾合通道區,進而提升薄膜電晶體之開電流,達到元件驅動效率提升之功效。

Description

薄膜電晶體結構
本發明係有關於一種薄膜電晶體結構,尤指具有雙閘極之薄膜電晶體結構。

平面顯示器產業中,薄膜電晶體液晶顯示器(TFTL-LCD) 為當今炙手可熱之產品,而在平面顯示器產品之中由於會大量應用薄膜電晶體,因此薄膜電晶體的品質優劣(如電流導通性等),幾乎對液晶顯示器整體品質具有密不可分的關連。
當薄膜電晶體導通時電子會自源極擴散至汲極。在薄膜電晶體中,依據半導體層材料之不同可再細分為多晶矽薄膜電晶體以及非晶矽薄膜電晶體,多晶矽薄膜電晶體具有較高的載子遷移率之優點但同時也伴隨著具有較大漏電流之缺點,而非晶矽薄膜電晶體的載子遷移率相較於多晶矽薄膜電晶體低,此因素造成非晶矽半導體層具有較高電阻率,進而限制了元件電流的導通性,故非晶矽薄膜電晶體的開電流也會間接造成驅動效率較不理想。
有鑑於此,對於現今薄膜電晶體之創新上,如何研發一種新穎的高驅動效率之薄膜電晶體,以改善上述所帶來的不便,實乃相關產業與企業公司們眼下不容忽視之一重要課題。

本發明之一主要目的,在於提供一種薄膜電晶體結構,其藉由設置一第三金屬層而達到提升薄膜電晶體之驅動特性。
本發明之一次要目的,在於提供一種薄膜電晶體結構,藉由設置一第三金屬層而達到優化電路佈局之功效。
為達上述之目的及功效,本發明提出一種薄膜電晶體結構,其包含一基板、一第一金屬層、一第一緩衝層、一半導體層、一第二金屬層、一第二緩衝層以及一第三金屬層,第一金屬層設於基板之上,第一緩衝層覆蓋基板及第一金屬層,半導體層設於第一緩衝層之上,第二金屬層設於半導體層之上並具有一間隔區,第二緩衝層覆蓋第二金屬層及半導體層,第三金屬層設於緩衝層之上,藉由半導體層上下方之該第一金屬層與該第三金屬層產生雙閘極,進而使開電流提升達到薄膜電晶體之驅動效率提升及電路佈局得以優化等功效。
1‧‧‧薄膜電晶體結構
11‧‧‧基板
12‧‧‧第一金屬層
13‧‧‧第一緩衝層
14‧‧‧半導體層
141‧‧‧通道區
15‧‧‧第二金屬層
151‧‧‧間隔區
16‧‧‧第二緩衝層
17‧‧‧第三金屬層
171‧‧‧凹槽

第一A圖:其係為本發明之第一實施例之結構示意圖;
第一B圖:其係為本發明之第一實施例之俯視圖;
第二A-二F圖:其係為本發明之第一實施例之製作流程示意圖;
第三A圖:其係為本發明之第二實施例之結構示意圖;
第三B圖:其係為本發明之第二實施例之俯視圖;
第四A圖:其係為本發明之第三實施例之結構示意圖;以及
第四B圖:其係為本發明之第三實施例之俯視圖。

茲為使 貴審查委員對本發明之特徵及所達成之功效有更進一步之瞭解與認識,謹佐以之實施例及配合圖式之說明,說明如後:
本發明之特色之一在於:鑑於薄膜電晶體之結構對電晶體的驅動效能以及電路佈局小型化等需求日益增加,故,本發明提出一種薄膜電晶體的結構,以增加開電流進而達到提升驅動效能以及優化電路佈局面積等功效。
首先請參閱第一A圖,其係為本發明之第一實施例之結構示意圖。如圖所示,其係在於說明本實施例之元件及其連接關係,本實施例為一種薄膜電晶體結構1,其包含一基板11、一第一金屬層12、一第一緩衝層13、一半導體層14、一第二金屬層15、一第二緩衝層16與一第三金屬層17,除此之外,於本實施例中該半導體層14具有一通道區141,於該第二金屬層具有一間隔區151以及於該第二緩衝層16之上方具有至少一凹槽171。
參閱第一B圖,其係為本發明之第一實施例之俯視圖;其係在於說明本實施例第二金屬層15以及第三金屬層17之相對關係,以俯視圖視角來看該第二金屬層15具有複數個部分,其分別作為薄膜電晶體之源極及汲極所用,而圖中虛框所涵蓋之範圍為該第三金屬層17對應該第二金屬層15之該間隔區151所設置之位置,由圖可知,本實施例中該第三金屬層17是完全覆蓋該間隔區151。
再參閱第二A圖至第二F圖,其係為本發明之第一實施例之製作流程示意圖。如圖所示,其係在於說明本實施例之薄膜電晶體中各元件間之連接關係,請參閱第二A圖至第二F圖,其係為本發明之第一實施例之製作流程示意圖;如第二A圖所示,該第一金屬層12設於該基板11之上,該第一金屬層12係作為薄膜電晶體之一閘極;如第二B圖所示,該第一緩衝層13覆蓋該基板11及該第一金屬層12;如第二C圖所示,該半導體層14設於該第一緩衝層13之上,該半導體層14可為非晶矽半導體材料,惟實際應用上並不限於此,亦可採用其他半導體材料,如多晶矽等;如第二D圖所示,該第二金屬層15設於該半導體層14之上,並具有一間隔區151,並藉由該間隔區151將該第二金屬層15區隔為兩部分,以分別作為薄膜電晶體之源極及汲極所用,而當施加適當電壓於薄膜電晶體時該半導體層14會有電子在進行傳遞,進而電性連接該間隔區151相異兩端之該第二金屬層15;如第二E圖所示,該第二緩衝層16覆蓋該第二金屬層15以及該半導體層14;以及,如第二F圖所示,該第三金屬層17設於該第二緩衝層16之上,且該第三金屬層17之寬度大於該間隔區151之寬度,該第三金屬層17之材料可為金屬元素、金屬化合物或者是金屬氧化物,可用以作為薄膜電晶體之另一閘極。
承上所述,於本實施例中該第一金屬層12寬度近似該間隔區151之寬度,此近似包含該第一金屬層12之寬度大於、等於以及小於該間隔區151之寬度,而最佳實施態樣係為該第一金屬層12寬度大於該間隔區151之寬度可具有較佳之結構特性。此外,復參閱第二F圖,於本實施例中該通道區141之寬度亦可依據設計需求,大於、等於或小於該第三金屬層17之寬度,以調整薄膜電晶體之結構特性。
承上,本實施例為一薄膜電晶體結構1,其係利用該三金屬層17來做為有別於該第一金屬層12之另一閘極,該半導體層14與各別上、下方作為閘極所用之第一金屬層12以及第二金屬層15互相感應,而透過該第一金屬層以及第三金屬層產生雙閘極結構,並藉此雙閘極結構夾合通道區,進而有效地提升元件的開關速度與開電流(open-current),達到具有提升開電流並改善整體薄膜電晶體結構1之放電速度以提升驅動效能。
請參閱第三A圖,其係為本發明之第二實施例之結構示意圖。如圖所示,其係在於說明本實施例之元件及其連接關係,本實施例與前一實施例之差異在於,該第三金屬層17之寬度等於該間隔區151之寬度,惟本實施例中之細部元件及其連接關係相同於前一實施例,故不再贅述。
參閱第三B圖,其係為本發明之第二實施例之俯視圖;其係在於說明本實施例第二金屬層15以及第三金屬層17之相對關係,以俯視圖視角來看該第二金屬層15具有複數個部分,其分別作為薄膜電晶體之源極及汲極所用,而圖中虛框所涵蓋之範圍為該第三金屬層17對應該第二金屬層15之該間隔區151所設置之位置,由圖可知,本實施例中該第三金屬層17之寬度是大於該間隔區151之寬度。復參閱第三A圖,本發明中所述之該通道區141之寬度進一步而言係指電子離子由該第二金屬層15之任一端流向相對之另一端時之距離,換言之,由於該通道區141必須與該第二金屬層15之兩端直接連接,故可推知該通道區141之寬度將為該間隔區151之寬度再加上該第二金屬層15之兩端部分寬度,故該通道區141會稍大於該間隔區151之寬度。基於上述,由第三B圖中可知,本實施例與前一實施例所含有之另一差異在於,該第三金屬層17係對應該通道區141覆蓋於該第二緩衝層16之上。
請參閱第四A圖,其係為本發明之第三實施例之結構示意圖。如圖所示,其係在於說明本實施例之元件及其連接關係,本實施例與前些實施例之差異在於,該第三金屬層17之寬度小於該間隔區151之寬度,惟本實施例中之細部元件及其連接關係相同於前些實施例,故不再贅述。
參閱第四B圖,其係為本發明之第三實施例之俯視圖;其係在於說明本實施例第二金屬層15以及第三金屬層17之相對關係,以俯視圖視角來看該第二金屬層15具有複數個部分,其分別作為薄膜電晶體之源極及汲極所用,而圖中虛框所涵蓋之範圍為該第三金屬層17對應該第二金屬層15之該間隔區151所設置之位置,由圖可知,本實施例與前些實施例之另一差異在於,該第三金屬層17是對應設置於該通道區141或該間隔區151之寬度範圍內。
綜上所述,本發明為一薄膜電晶體結構,其包含一基板、一第一金屬層、一第一緩衝層、一半導體層、一第二金屬層、一第二緩衝層以及一第三金屬層,該第一金屬層設於該基板之上,該第一緩衝層覆蓋該基板及該第一金屬層,該半導體層設於該第一緩衝層之上,該第二金屬層設於該半導體層之上,並具有一間隔區,該第二緩衝層覆蓋該第二金屬層及該半導體層,該第三金屬層設於該第二緩衝層之上,本發明透過所設置之第一金屬層與第三金屬層可各自對該半導體層產生感應形成雙閘極,進而改善薄膜電晶體元件之驅動能力並同時優化電路佈局。
故本發明確實為一具有新穎性、進步性及可供產業上利用之發明,應符合我國專利法專利申請之要件無疑,爰依法提出發明專利申請,祈 鈞局早日賜准專利,至 為德感。
惟以上所述者,僅為本發明之實施例而已,並非用來限定本發明實施之範圍,故舉凡依本發明申請專利範圍所述之形狀、構造、特徵及精神所為之均等變化與修飾,均應包括於本發明之申請專利範圍內。
1‧‧‧薄膜電晶體結構
11‧‧‧基板
12‧‧‧第一金屬層
13‧‧‧第一緩衝層
14‧‧‧半導體層
141‧‧‧通道區
15‧‧‧第二金屬層
151‧‧‧間隔區
16‧‧‧第二緩衝層
17‧‧‧第三金屬層
171‧‧‧凹槽

Claims (10)

  1. 一種薄膜電晶體結構,其包含:
    一基板,
    一第一金屬層,設於該基板之上;
    一第一緩衝層,覆蓋該基板及該第一金屬層;
    一半導體層,設於該第一緩衝層之上;
    一第二金屬層,設於該半導體層之上,並具有一間隔區;
    一第二緩衝層,覆蓋該第二金屬層;以及
    一第三金屬層,設於該第二緩衝層之上。
  2. 如申請專利範圍1所述之薄膜電晶體結構,其中該第一金屬層之寬度大於該間隔區之寬度。
  3. 如申請專利範圍1所述之薄膜電晶體結構,其中該第二緩衝層上方具有至少一凹槽,該第三金屬層設於該凹槽內。
  4. 如申請專利範圍1所述之薄膜電晶體結構,其中該第三金屬層之寬度大於該間隔區之寬度。
  5. 如申請專利範圍1所述之薄膜電晶體結構,其中該第三金屬層之寬度等於該間隔區之寬度。
  6. 如申請專利範圍1所述之薄膜電晶體結構,其中該第三金屬層之寬度小於該間隔區之寬度。
  7. 如申請專利範圍1所述之薄膜電晶體結構,其中該半導體層中具有一通道區。
  8. 如申請專利範圍1所述之薄膜電晶體結構,其中該通道區之寬度小於該第三金屬層之寬度。
  9. 如申請專利範圍1所述之薄膜電晶體結構,其中該通道區之寬度等於該第三金屬層之寬度。
  10. 如申請專利範圍1所述之薄膜電晶體結構,其中該通道區之寬度大於該第三金屬層之寬度。
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