JP5311955B2 - 表示装置の作製方法 - Google Patents
表示装置の作製方法 Download PDFInfo
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- JP5311955B2 JP5311955B2 JP2008257711A JP2008257711A JP5311955B2 JP 5311955 B2 JP5311955 B2 JP 5311955B2 JP 2008257711 A JP2008257711 A JP 2008257711A JP 2008257711 A JP2008257711 A JP 2008257711A JP 5311955 B2 JP5311955 B2 JP 5311955B2
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- film
- impurity element
- donor
- semiconductor film
- microcrystalline semiconductor
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/49—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET
- H01L29/4908—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET for thin film semiconductor, e.g. gate of TFT
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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
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/04—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their crystalline structure, e.g. polycrystalline, cubic or particular orientation of crystalline planes
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- H01—ELECTRIC ELEMENTS
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
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- H—ELECTRICITY
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- 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
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- 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
- H01L29/78609—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 for preventing leakage current
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- 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
- H01L29/78696—Thin 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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Description
ここでは、ゲート絶縁膜との界面及び膜全体における結晶性が高く、通常の微結晶半導体膜をチャネル形成領域に有する薄膜トランジスタと比較して、電界効果移動度及びオン電流の高い薄膜トランジスタの構造について、図1を用いて説明する。
本実施の形態では、絶縁膜との界面及び膜全体における結晶性が高い微結晶半導体膜の作製方法について示す。また、上記実施の形態1に示す、ゲート絶縁膜との界面及び膜全体における結晶性が高く、通常の微結晶半導体膜をチャネル形成領域に有する薄膜トランジスタと比較して、電界効果移動度及びオン電流の高い薄膜トランジスタの作製工程について示す。
本実施の形態では、表示装置の一形態として、実施の形態1及び実施の形態2で示す薄膜トランジスタを有する液晶表示装置について、以下に示す。ここでは、VA(Vertical Alignment)型の液晶表示装置について、図31乃至図33を用いて説明する。VA型の液晶表示装置とは、液晶パネルの液晶分子の配列を制御する方式の一種である。VA型の液晶表示装置は、電圧が印加されていないときにパネル面に対して液晶分子が垂直方向を向く方式である。本実施の形態では、特に画素(ピクセル)をいくつかの領域(サブピクセル)に分け、それぞれ別の方向に分子を倒すよう工夫されている。これをマルチドメイン化あるいはマルチドメイン設計という。以下の説明では、マルチドメイン設計が考慮された液晶表示装置について説明する。
本実施の形態では、表示装置の一形態として、実施の形態1及び実施の形態2で示す薄膜トランジスタを有する発光表示装置について、以下に示す。ここでは、発光表示装置が有する画素の構成について説明する。図34(A)に、画素の上面図の一形態を示し、図34(B)に図34(A)のA−Bに対応する画素の断面構造の一形態を示す。
次に、本発明の表示装置の一形態である表示パネルの構成について、以下に示す。
本発明により得られる表示装置等は、アクティブマトリクス型表示装置パネルに用いることができる。即ち、それらを表示部に組み込んだ電子機器全てに本発明を実施できる。
0.1%PH3(Ar希釈)の流量500sccm
(条件2)
SiH4の流量100sccm、0.5%PH3(H2希釈)の流量170sccm
(条件3)
SiH4の流量100sccm、H2の流量153sccm、0.5%PH3/H2の流量17sccm
・条件1の試料・・・9.94×1016〜1.58×1018atoms/cm3
・条件2の試料・・・1.89×1017〜2.56×1018atoms/cm3
・条件3の試料・・・3.17×1016〜1.74×1017atoms/cm3
・条件1の試料・・・31nm/dec
・条件2の試料・・・33nm/dec
・条件3の試料・・・50nm/dec
SiH4の流量30sccm、N2Oの流量1200sccm、0.5%PH3(H2希釈)の流量60sccm
(条件5)
SiH4の流量30sccm、N2Oの流量1200sccm、0.5%PH3(H2希釈)の流量6sccm
・条件4の試料・・・7.17×1016〜6.72×1017atoms/cm3
・条件5の試料・・・4.24×1016〜1.82×1017atoms/cm3
・条件4の試料・・・38nm/dec
・条件5の試料・・・58nm/dec
保護膜としてリンを含むアモルファスシリコン膜を形成した。このときの成膜条件を、RF電源周波数を13.56MHz、RF電源のパワーを60Wとし、170Paの圧力として、厚さ50nmのリンを含むアモルファスシリコン膜を反応室の内壁に成膜した。また、このときの原料ガスの流量条件を以下に示す。
SiH4の流量100sccm、0.5%PH3(H2希釈)の流量170sccm
(条件7)
保護膜として窒化珪素膜、酸化窒化珪素膜、及びアモルファスシリコン膜を積層した。このときの窒化珪素膜の成膜条件を、RF電源周波数を13.56MHz、RF電源のパワーを370Wとし、シラン流量、水素流量、窒素流量、アンモニア流量をそれぞれ、10sccm、500sccm、550sccm、140sccmとし、100Paの圧力として、厚さ110nmの窒化珪素膜を反応室の内壁に成膜した。また、酸化窒化珪素膜の成膜条件を、RF電源周波数を13.56MHz、RF電源のパワーを50Wとし、成膜温度を280℃とし、シラン流量と一酸化二窒素流量をそれぞれ30sccm、1200sccmとし、40Paの圧力として、厚さ110nmの酸化窒化珪素膜をプラズマCVD法により窒化珪素膜上に形成した。アモルファスシリコン膜の成膜条件を、RF電源周波数を13.56MHz、RF電源のパワーを120Wとし、成膜温度を280℃とし、シランの流量を300sccmとし、170Paの圧力として、厚さ200nmのアモルファスシリコン膜をプラズマCVD法により酸化窒化珪素膜上に形成した。
・条件6の試料・・・6.09×1016〜1.29×1017atoms/cm3
・条件7の試料・・・2.30×1016〜5.94×1016atoms/cm3
・条件6の試料・・・114nm/dec
・条件7の試料・・・90nm/dec
Claims (2)
- 基板上に形成されたゲート電極及び第1の電極と、
前記ゲート電極上及び前記第1の電極上に形成されたゲート絶縁膜と、
前記ゲート絶縁膜を介して前記ゲート電極上に形成され、ドナーとなる不純物元素の濃度がSIMSの検出限界より多く、且つ、アクセプターとなる元素を含む第1の微結晶半導体膜と、
前記第1の微結晶半導体膜上に形成され、ドナーとなる不純物元素の濃度がSIMSの検出限界以下の第2の微結晶半導体膜と、
前記第2の微結晶半導体膜上に形成され、ドナーとなる不純物元素の濃度がSIMSの検出限界以下の一対のアモルファス半導体膜と、
前記一対のアモルファス半導体膜上の一対の一導電型を付与する不純物元素が添加された半導体膜と、
前記一対の一導電型を付与する不純物元素が添加された半導体膜上に形成された一対の導電膜と、を形成する第1の工程と、
前記一対の導電膜上及び前記ゲート絶縁膜上に保護絶縁膜を形成する第2の工程と、
前記保護絶縁膜上に感光性の有機樹脂膜を形成する第3の工程と、
前記感光性の有機樹脂膜を感光した後に露光を行うことによって、前記感光性の有機樹脂膜に、前記一対の導電膜の一方の上に形成され且つ前記保護絶縁膜に達する第1の凹部と、前記第1の電極上に形成され且つ前記保護絶縁膜に達しない第2の凹部と、を形成する第4の工程と、
前記感光性の有機樹脂膜をエッチングしつつ、前記保護絶縁膜の一部を除去して、前記一対の導電膜の一方に達するコンタクトホールを形成する第5の工程と、
前記感光性の有機樹脂膜をアッシングして、前記コンタクトホールの面積を広げるとともに、前記第2の凹部を加工して前記保護絶縁膜に達する第3の凹部を形成する第6の工程と、
前記感光性の有機樹脂膜上、前記コンタクトホール内、及び前記第3の凹部内に第2の電極を形成する第7の工程と、を有し、
前記第1の微結晶半導体膜は、前記ドナーとなる不純物元素の濃度が前記ゲート絶縁膜から前記第2の微結晶半導体膜に向かって減少する濃度分布を有することを特徴とする表示装置の作製方法。 - 請求項1において、
前記第1の微結晶半導体膜にアクセプターとなる元素が含まれていることを特徴とする表示装置の作製方法。
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2008
- 2008-10-02 JP JP2008257711A patent/JP5311955B2/ja not_active Expired - Fee Related
- 2008-10-27 US US12/258,569 patent/US8304779B2/en not_active Expired - Fee Related
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CN101425544B (zh) | 2012-12-05 |
JP2009135436A (ja) | 2009-06-18 |
US8304779B2 (en) | 2012-11-06 |
CN101425544A (zh) | 2009-05-06 |
TW200943551A (en) | 2009-10-16 |
US20090114921A1 (en) | 2009-05-07 |
TWI446543B (zh) | 2014-07-21 |
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