JP6323055B2 - 薄膜トランジスタアレイおよびその製造方法 - Google Patents
薄膜トランジスタアレイおよびその製造方法 Download PDFInfo
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- JP6323055B2 JP6323055B2 JP2014032017A JP2014032017A JP6323055B2 JP 6323055 B2 JP6323055 B2 JP 6323055B2 JP 2014032017 A JP2014032017 A JP 2014032017A JP 2014032017 A JP2014032017 A JP 2014032017A JP 6323055 B2 JP6323055 B2 JP 6323055B2
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- thin film
- upper pixel
- film transistor
- insulating layer
- pixel electrode
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- H—ELECTRICITY
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- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types 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
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
- H01L29/78633—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device with a light shield
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1248—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
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- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1255—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs integrated with passive devices, e.g. auxiliary capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types 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
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having a potential-jump barrier or a surface barrier
- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/468—Insulated gate field-effect transistors [IGFETs] characterised by the gate dielectrics
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
- H10K59/1213—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being TFTs
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/126—Shielding, e.g. light-blocking means over the TFTs
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- 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
- G02F1/136209—Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
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- 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
- G02F1/136286—Wiring, e.g. gate line, drain line
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having a potential-jump barrier or a surface barrier
- H10K10/80—Constructional details
- H10K10/82—Electrodes
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having a potential-jump barrier or a surface barrier
- H10K10/80—Constructional details
- H10K10/88—Passivation; Containers; Encapsulations
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
- H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/60—Forming conductive regions or layers, e.g. electrodes
- H10K71/611—Forming conductive regions or layers, e.g. electrodes using printing deposition, e.g. ink jet printing
Description
以下、第1の実施形態について、図1〜4を用いて説明する。
図1は薄膜トランジスタアレイ1000の概略模式図であり、図2は図1の1画素分の拡大図であり、図3は図2のa−b線に沿った断面模式図であり、図4は薄膜トランジスタアレイ1000の外周部の概略模式図である。
以下、薄膜トランジスタアレイ1000の各構成要素について順に説明する。
OD値 = log10(I0 /I) (1)
ここで、I0;入射光強度、I;透過光強度である。
以下、第2の実施形態について、図5〜7を用いて説明する。
図5は薄膜トランジスタアレイ2000の概略模式図であり、図6は図5の1画素分の拡大図であり、図7は図6のc−d線に沿った断面模式図である。
本参考例では、第1の実施形態で説明したボトムゲート・ボトムコンタクト型薄膜トランジスタアレイ1000を製造した。
基板10としてポリエチレンナフタレート(PEN)フィルムを用いた。銀ナノ粒子を分散させたインキを用い、インクジェット法でゲート電極21、ゲート配線22、キャパシタ電極23、キャパシタ配線24を得た。ゲート絶縁膜として、ポリイミドをダイコーターにより塗布し、180℃で1時間乾燥させてゲート絶縁膜11を形成した。
半導体材料として、6,13−ビス(トリイソプロピルシリルエチニル)ペンタセン(TIPS−ペンタセン)(Aldrich製)を用いた。テトラリンに2重量%で溶解させたものをインキとして用いた。また、凸版として感光性樹脂凸版を用いて、150線のアニロックスロールを用いて凸版印刷によりストライプ形状の半導体を印刷し、100℃で60分乾燥させて半導体層12を形成した。
次に、層間絶縁材料としてエポキシ樹脂をダイコーターにより塗布し、露光、現像により層間絶縁膜14およびビア部16を形成した。
次に、上部画素電極材料として銀ペーストを用い、スクリーン印刷法により上部画素電極29を形成した。このとき、隣り合う上部画素電極間の距離は設計上100μmであったが、形成されたパターン間の距離は最大で90μm、最小で50μmであった。
次に、遮光性を有する絶縁層材料としてカーボンブラックを含有したノボラック樹脂を用い、インクジェット法により上部画素電極間に遮光性を有する絶縁層15を形成した。
本実施例では、第2の実施形態で説明した上部画素電極29の一部と遮光性を有する絶縁層15の一部が積層されたボトムゲート・ボトムコンタクト型薄膜トランジスタアレイを製造した。
上部画素電極29までは参考例1と同様の方法で形成した。
本参考例では、第1の実施形態で説明したボトムゲート・ボトムコンタクト型薄膜トランジスタアレイ1000を製造した。
層間絶縁膜14およびビア部16までは参考例1と同様の方法で形成した。
次に、遮光性を有する絶縁層材料としてカーボンブラックを含有したノボラック樹脂にフルオロアルキル基含有オリゴマーを添加した材料をダイコーターを用いて塗布し、フォトリソグラフィーによりパターニングし、遮光性を有する絶縁層15を形成した。このとき、遮光性を有する絶縁層の線幅はd1、d3ともに20μmであった。
次に、上部画素電極材料として銀ペーストを用い、スクリーン印刷法により上部画素電極29を形成した。このとき、遮光性を有する絶縁層15の表面で銀ペーストがはじかれるため、隣り合う上部画素電極間の距離は20μmとなった。また、参考例1、実施例2同様、異常動作は確認されなかった。
本比較例では遮光性を有する絶縁層15を形成しない以外は参考例1と同様である。この結果、薄膜トランジスタアレイにソーラーシミュレーターを用いて1SUNの光を照射しながらトランジスタ特性を測定した結果、閾値電圧は光を照射しない場合と比較してプラス側に10Vシフト、On電流は2倍に増加、Off電流は10倍に増加し、異常動作を示した。
本比較例では遮光性を有する絶縁層15の光学濃度が0.5である以外は参考例1と同様である。この結果、薄膜トランジスタアレイにソーラーシミュレーターを用いて1SUNの光を照射しながらトランジスタ特性を測定した結果、閾値電圧は光を照射しない場合と比較してプラス側に4Vシフト、On電流は1.3倍に増加、Off電流は4倍に増加し、異常動作を示した。
本比較例では、上部画素電極29の光学濃度が0.5である以外は参考例1と同様である。この結果、薄膜トランジスタアレイにソーラーシミュレーターを用いて1SUNの光を照射しながらトランジスタ特性を測定した結果、閾値電圧は光を照射しない場合と比較してプラス側に6Vシフト、On電流は1.5倍に増加、Off電流は6倍に増加し、異常動作を示した。
本比較例では、遮光性を有する絶縁層15の光学濃度が波長300nmから1000nmの波長領域において膜厚1μmあたり1であり、膜厚が500nmである以外は実施例2と同様である。この結果、薄膜トランジスタアレイにソーラーシミュレーターを用いて1SUNの光を照射しながらトランジスタ特性を測定した結果、閾値電圧は光を照射しない場合と比較してプラス側に2Vシフト、On電流は1.2倍に増加、Off電流は2.5倍に増加し、異常動作を示した。
本比較例では、遮光性を有する絶縁層15の光学濃度が波長300nmから600nmの波長領域においては膜厚1μmあたり1であるが、600nmから1000nmの波長領域においては膜厚1μmあたり0.1である以外は実施例2と同様である。この結果、薄膜トランジスタアレイにソーラーシミュレーターを用いて1SUNの光を照射しながらトランジスタ特性を測定した結果、閾値電圧は光を照射しない場合と比較してプラス側に2Vシフト、On電流は1.2倍に増加、Off電流は2.5倍に増加し、異常動作を示した。
11 ゲート絶縁膜
12 半導体層
13 封止層
14 層間絶縁膜
15 遮光性を有する絶縁層
16 ビア部
21 ゲート電極
22 ゲート配線
23 キャパシタ電極
24 キャパシタ配線
25 画素電極
26 ドレイン電極
27 ソース電極
28 ソース配線
29 上部画素電極
30 積層部
100、200 薄膜トランジスタ
1000、2000 薄膜トランジスタアレイ
Claims (7)
- 基板と、前記基板上に少なくともゲート電極と、ゲート絶縁膜と、ソース・ドレイン電極と、前記ソース・ドレイン電極間に形成された半導体層と、層間絶縁膜と、上部画素電極とを有する複数の薄膜トランジスタと、前記ゲート電極が接続されるゲート配線と、前記ソース電極が接続されるソース配線とを備え、隣り合う上部画素電極間に遮光性を有する絶縁層が形成され、前記上部画素電極の一部が前記遮光性を有する絶縁層の一部の上に積層されている、薄膜トランジスタアレイ。
- 前記上部画素電極、若しくは前記遮光性を有する絶縁層の何れか一方の表面が、撥液性を有する、請求項1に記載の薄膜トランジスタアレイ。
- 前記上部画素電極は、前記隣り合う上部画素電極間に設けられた前記遮光性を有する絶縁層よりも厚膜である、請求項1または2に記載の薄膜トランジスタアレイ。
- 前記上部画素電極と前記遮光性を有する絶縁層の光学濃度が、波長300nmから1000nmの波長領域において、膜厚1μmあたり1以上である、請求項1乃至3のいずれかに記載の薄膜トランジスタアレイ。
- 前記隣り合う上部画素電極間の距離が、10μm以上150μm以下である、請求項1乃至4のいずれかに記載の薄膜トランジスタアレイ。
- 請求項1乃至5のいずれかに記載の薄膜トランジスタの製造方法であって、前記遮光性を有する絶縁層をインクジェット法により形成する工程を含む、薄膜トランジスタの製造方法。
- 請求項1乃至5のいずれかに記載の薄膜トランジスタの製造方法であって、前記上部画素電極をスクリーン印刷法により形成する工程を含む、薄膜トランジスタの製造方法。
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