JP2014197664A - 半導体装置およびその作製方法 - Google Patents
半導体装置およびその作製方法 Download PDFInfo
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- JP2014197664A JP2014197664A JP2013248140A JP2013248140A JP2014197664A JP 2014197664 A JP2014197664 A JP 2014197664A JP 2013248140 A JP2013248140 A JP 2013248140A JP 2013248140 A JP2013248140 A JP 2013248140A JP 2014197664 A JP2014197664 A JP 2014197664A
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Classifications
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor 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
- H01L29/66—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
- H01L29/78696—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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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture 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
- H01L21/18—Manufacture 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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/32051—Deposition of metallic or metal-silicide layers
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture 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
- H01L21/18—Manufacture 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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture 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
- H01L21/34—Manufacture 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 not provided for in groups H01L21/0405, H01L21/0445, H01L21/06, H01L21/16 and H01L21/18 with or without impurities, e.g. doping materials
- H01L21/46—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/428
- H01L21/461—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/428 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/469—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/428 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After-treatment of these layers
- H01L21/471—Inorganic layers
- H01L21/473—Inorganic layers composed of oxides or glassy oxides or oxide based glass
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture 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
- H01L21/34—Manufacture 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 not provided for in groups H01L21/0405, H01L21/0445, H01L21/06, H01L21/16 and H01L21/18 with or without impurities, e.g. doping materials
- H01L21/46—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/428
- H01L21/461—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/428 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/469—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/428 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After-treatment of these layers
- H01L21/4757—After-treatment
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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 potential barriers; including integrated passive circuit elements having potential barriers
- 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 potential barriers; including integrated passive circuit elements having potential barriers 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 potential barriers; including integrated passive circuit elements having potential barriers 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
- H01L27/1222—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 potential barriers; including integrated passive circuit elements having potential barriers 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, shape or crystalline structure of the active layer
- H01L27/1225—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 potential barriers; including integrated passive circuit elements having potential barriers 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, shape or crystalline structure of the active layer with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
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- H01L29/00—Semiconductor 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
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66969—Multistep manufacturing processes of devices having semiconductor bodies not comprising group 14 or group 13/15 materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor 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
- H01L29/66—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
- H01L29/78618—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 characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure
-
- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor 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
- H01L29/66—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
- H01L29/7869—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thin Film Transistor (AREA)
- Liquid Crystal (AREA)
- Electroluminescent Light Sources (AREA)
- Electrodes Of Semiconductors (AREA)
- Drying Of Semiconductors (AREA)
Abstract
【解決手段】ゲート電極上にゲート絶縁膜を形成し、ゲート電極上のゲート絶縁膜上に、酸化物半導体層を形成し、酸化物半導体層上に、スパッタリング法により酸化物層を形成して、酸化物半導体層と酸化物層とを含む酸化物積層膜を形成し、酸化物積層膜を所定の形状に加工し、所定の形状に加工した酸化物積層膜上に、Tiを主成分とする導電膜を形成し、導電膜をエッチングして、ソース電極およびドレイン電極を形成するとともに、バックチャネル側に凹部を形成し、加熱処理により、酸化物積層膜がソース電極およびドレイン電極と接する部分をn型化する。
【選択図】図2
Description
酸化物半導体(OS)層を用いたトランジスタの信頼性を高めるためには、信頼性に影響を与える要因を明らかにすることが重要である。そこで、酸化物半導体層を用いたトランジスタの信頼性を高めるために、以下のような劣化機構のモデルを立てた。
以下に、酸化物半導体層を用いたトランジスタの劣化モードが、どのように起こるかを説明する。
以下では、酸素欠損を低減し、安定した電気特性を有する酸化物半導体を用いたトランジスタについて説明する。
図1(A)乃至図1(C)に、半導体装置が有するトランジスタ100の上面図および断面図を示す。図1(A)はトランジスタ100の上面図であり、図1(B)は、図1(A)の一点鎖線A1−A2間の断面図であり、図1(C)は、図1(A)の一点鎖線B1−B2間の断面図である。なお、図1(A)では、明瞭化のため、トランジスタ100の構成要素の一部(例えば、基板101、ゲート絶縁膜103、層間絶縁膜109など)を省略している。
ここで、図1(B)の酸化物積層膜104近傍の一点破線C1−C2におけるエネルギーバンド構造について、図3(A)を用いて説明し、トランジスタ100におけるキャリアの流れについて、図3(B)および図3(C)を用いて説明する。
以下に、トランジスタ100の具体的な構成要素について、図1を参照して説明する。
[3.1.ゲート電極およびゲート絶縁膜の形成]
トランジスタ100の作製方法について、図5および図6を用いて説明する。本作製方法においては、トランジスタ100のソース電極108aおよびドレイン電極108bの導電材料にチタンを用いる場合について説明する。
次に、図5(B)に示すように、ゲート絶縁膜103上に酸化物積層膜104を形成する。ここでは、酸化物積層膜104は、下層の酸化物半導体層105と上層の酸化物層106とにより構成される2層構造である。ただし、酸化物積層膜104は2層構造に限られず、三層以上の積層構造であってもよく、また酸化物半導体層105の単層構造であってもよい。
ここで、酸化物半導体層および酸化物層について詳説する。酸化物積層膜104を構成する酸化物半導体層105と酸化物層106とは、少なくともインジウム(In)を含み、スパッタリング法、好ましくはDCスパッタリング法で成膜することのできるスパッタリングターゲットを用いて成膜することができる。スパッタリングターゲットにインジウムを含ませることで導電性が高まるため、DCスパッタリング法で成膜することを容易なものとする。
CAAC−OS層を形成するために、以下の条件を適用することが好ましい。
次に、酸化物積層膜104上にソース電極およびドレイン電極を形成する。
その後、酸化物積層膜104およびソース電極108aおよびドレイン電極108b上に、酸化物絶縁膜109aを形成する。次に、酸化物絶縁膜109a上に酸化物絶縁膜109bを形成する(図6(A)参照)。
ここでは、上記のようにして作製されるトランジスタの構造について詳述する。
図2(A)に示すトランジスタ100aは、基板101上に設けられるゲート電極102を有する。また、基板101およびゲート電極102上に、ゲート絶縁膜103が形成され、ゲート絶縁膜103を介して、ゲート電極102と重なる酸化物積層膜104と、酸化物積層膜104に接するソース電極108aおよびドレイン電極108bとを有する。また、ゲート絶縁膜103、酸化物積層膜104、およびソース電極108aおよびドレイン電極108b上には、層間絶縁膜109が形成される。層間絶縁膜109は、酸化物絶縁膜109aと酸化物絶縁膜109bとの積層構造である。また、層間絶縁膜109上に層間絶縁膜111を有する。
図2(B)に示すトランジスタ100bは、ソース電極108aおよびドレイン電極108bの直下に形成されたn+領域110がトランジスタ100aよりも広く、深く拡散している。そのため、ソース電極108aとドレイン電極108bとの間の領域にまでn+領域110が伸びている。トランジスタ100bの実効的なチャネル長(Leff)は、設計におけるチャネル長であるソース電極108aとドレイン電極108bとの間の距離よりも短く、ソース電極108aおよびドレイン電極108bよりも内側のn+領域110間の距離となる。
図2(C)に示すトランジスタ100cは、ソース電極108aおよびドレイン電極108bの間の領域において、酸化物積層膜104の一部が除去された凹部を有する構造である。
上述したトランジスタを用いた半導体装置について説明する。なお、本発明の一態様に係る半導体装置は、マイクロプロセッサ、画像処理回路、表示モジュール用のコントローラ、DSP(Digital Signal Processor)、マイクロコントローラなどの、半導体素子を用いた各種半導体集積回路をその範疇に含む。また、本発明の一態様に係る半導体装置は、表示モジュールや、上記半導体集積回路を用いたRFタグなどの各種装置も、その範疇に含む。
図17は、EL素子を用いた表示モジュール(以下、EL表示モジュールという)の画素の回路図の一例である。
次に、液晶素子を用いた表示モジュール(以下、液晶表示モジュールという)について説明する。
ここでは、被検知体の近接または接触を検知可能なセンサ(以降、タッチセンサと呼ぶ)の構成例について説明する。
図23(A)、(B)は、相互容量方式のタッチセンサの構成を示す模式図と、入出力波形の模式図である。タッチセンサは一対の電極を備え、これらの間に容量が形成されている。一対の電極のうち一方の電極に入力電圧が入力される。また、他方の電極に流れる電流(または、他方の電極の電位)を検出する検出回路を備える。
図23(C)は、マトリクス状に配置された複数の容量を備えるタッチセンサの構成例を示す。
以下では、複数の画素を有する表示部にタッチセンサを組み込んだタッチパネルの構成例について説明する。ここでは、画素に設けられる表示素子として、液晶素子を適用した例を示す。
以下、図25および図26を用いて、上述したタッチパネルの動作について説明する。
以下では、上記タッチパネルに用いることのできる画素の構成例について説明する。
次に、半導体装置を構成部品として適用した電気機器について説明する。
電気機器とは、電気の力によって作用する部分を含む工業製品をいう。電気機器は、家電等の民生用に限られず、業務用、産業用、軍事用等、種々の用途のものを広くその範疇とする。
これらの電気機器の具体例を、図28(A)乃至(D)に示す。
100a トランジスタ
100b トランジスタ
100c トランジスタ
101 基板
102 ゲート電極
103 ゲート絶縁膜
104 酸化物積層膜
105 酸化物半導体層
106 酸化物層
107 導電膜
108a ソース電極
108b ドレイン電極
109 層間絶縁膜
109a 酸化物絶縁膜
109b 酸化物絶縁膜
110 n+領域
111 層間絶縁膜
112 凹部
113 GaOx層または混合層
114 酸化物層
120 トラップ準位
700 基板
701 基板
702 ゲート電極
703 保護絶縁膜
704a ソース電極
704b ドレイン電極
705 ゲート絶縁膜
706 酸化物膜
719 発光素子
720 絶縁膜
721 絶縁膜
731 端子
732 FPC
733a 配線
733b 配線
733c 配線
734 シール材
735 駆動回路
736 駆動回路
737 画素領域
741 トランジスタ
742 キャパシタ
743 スイッチ素子
744 信号線
750 画素
751 トランジスタ
752 キャパシタ
753 液晶素子
754 走査線
755 信号線
781 電極
782 発光層
783 電極
784 隔壁
785a 中間層
785b 中間層
785c 中間層
785d 中間層
786a 発光層
786b 発光層
786c 発光層
791 電極
792 絶縁膜
793 液晶層
794 絶縁膜
795 スペーサ
796 電極
797 基板
3501 配線
3502 配線
3503 トランジスタ
3504 液晶素子
3510 配線
3510_1 配線
3510_2 配線
3511 配線
3515_1 ブロック
3515_2 ブロック
3516 ブロック
3521 トランジスタ
3522 電極
3523 電極
3524 液晶
3525 カラーフィルタ
3526 配線
4001 基板
4002 画素部
4003 信号線駆動回路
4004 走査線駆動回路
4005 シール材
4006 基板
4008 液晶層
4010 トランジスタ
4011 トランジスタ
4013 液晶素子
4015 接続端子電極
4016 端子電極
4018 FPC
4019 異方性導電層
4020a ゲート絶縁膜
4020b ゲート絶縁膜
4031 電極
4032a 絶縁膜
4032b 絶縁膜
4033 絶縁膜
4034 電極
4035 スペーサ
4038 絶縁膜
4040 平坦化絶縁膜
4042 絶縁膜
4050 配線
4052 配線
9000 筐体
9001 ボタン
9002 マイクロフォン
9003 表示部
9004 スピーカ
9005 カメラ
9010 筐体
9011 表示部
9020 筐体
9021 ボタン
9022 マイクロフォン
9023 表示部
9030 筐体
9031a 表示部
9031b 表示部
9032 留め具
9033 操作スイッチ
9040 筐体
9041 表示部
9042 操作ボタン
9043 スピーカ
9044 マイクロフォン
9045 表示部
Claims (13)
- ゲート電極と、
前記ゲート電極と重なるゲート絶縁膜と、
前記ゲート絶縁膜を介して前記ゲート電極と重なる酸化物積層膜と、
前記酸化物積層膜と接するソース電極およびドレイン電極と、を有し、
前記酸化物積層膜は、前記ソース電極および前記ドレイン電極と接する部分がもっとも低抵抗であり、かつ前記ソース電極および前記ドレイン電極から遠ざかるに従って抵抗が高くなることを特徴とする半導体装置。 - ゲート電極と、
前記ゲート電極と重なるゲート絶縁膜と、
前記ゲート絶縁膜を介して前記ゲート電極と重なる酸化物積層膜と、
前記酸化物積層膜と接するソース電極およびドレイン電極と、を有し、
前記酸化物積層膜は、前記ソース電極と前記ドレイン電極との間に凹部を有し、前記ソース電極および前記ドレイン電極と接する部分から前記凹部の側面の一部に渡って低抵抗領域を有することを特徴とする半導体装置。 - ゲート電極と、
前記ゲート電極上のゲート絶縁膜と、
前記ゲート絶縁膜上の酸化物積層膜と、
前記酸化物積層膜と接するソース電極およびドレイン電極と、
前記ソース電極および前記ドレイン電極と接する前記酸化物積層膜の部分に設けられたn+領域と、を有し、
前記酸化物積層膜中において、前記n+領域は前記ソース電極と前記ドレイン電極との間の領域に延びていることを特徴とする半導体装置。 - 請求項1または請求項3において、
実効的なチャネル長は、前記ソース電極と前記ドレイン電極との間の距離よりも短いことを特徴とする半導体装置。 - ゲート電極と、
前記ゲート電極上のゲート絶縁膜と、
前記ゲート絶縁膜上の酸化物積層膜と、
前記酸化物積層膜と接するソース電極およびドレイン電極と、
前記ソース電極および前記ドレイン電極と接する前記酸化物積層膜の部分に設けられたn+領域と、を有し、
前記ソース電極と前記ドレイン電極との間において、前記酸化物積層膜は凹部を有し、
前記n+領域は前記凹部の側面の一部と接していることを特徴とする半導体装置。 - 請求項5において、
前記凹部の深さは、前記n+領域の深さよりも深いことを特徴とする半導体装置。 - 請求項1乃至請求項6のいずれか一項において、
前記酸化物積層膜は、In、GaおよびZnを含む酸化物の積層構造であることを特徴とする半導体装置。 - ゲート電極上にゲート絶縁膜を形成し、
ゲート電極上のゲート絶縁膜上に、酸化物半導体層を形成し、
前記酸化物半導体層上に、スパッタリング法により酸化物層を形成して、前記酸化物半導体層と前記酸化物層とを含む酸化物積層膜を形成し、
前記酸化物積層膜を所定の形状に加工し、
所定の形状に加工した前記酸化物積層膜に接して、Tiを主成分とする導電膜を形成し、
前記導電膜をエッチングして、ソース電極およびドレイン電極を形成するとともに、バックチャネル側に凹部を形成し、
熱処理により、前記酸化物積層膜が前記ソース電極および前記ドレイン電極と接する部分をn型化することを特徴とする半導体装置の作製方法。 - 請求項8において、
前記酸化物半導体層および前記酸化物層は、それぞれIn、M(Al、Ga、Y、La、CeまたはNd)およびZnを含む酸化物であり、
前記酸化物層は、前記酸化物半導体層よりも含有するMの割合が高いことを特徴とする半導体装置の作製方法。 - 請求項8または請求項9において、
前記酸化物積層膜の所定の形状への加工の後、前記導電膜のエッチング前に熱処理を行わないことを特徴とする半導体装置の作製方法。 - 請求項8乃至請求項10のいずれか一項において、
前記ソース電極と前記ドレイン電極との最小の間隔は、3μm以下であることを特徴とする半導体装置の作製方法。 - 請求項8乃至請求項11のいずれか一項において、
前記Tiを主成分とする導電膜は、Tiを主成分とする第1の導電層と、単層または積層の第2の導電層との積層膜であることを特徴とする半導体装置の作製方法。 - 請求項12において、
前記第2の導電層は、Cuを主成分とする導電層、Alを主成分とする導電層、Alを主成分とする導電層とTiを主成分とする導電層との積層のいずれかであることを特徴とする半導体装置の作製方法。
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Also Published As
Publication number | Publication date |
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US20140151686A1 (en) | 2014-06-05 |
JP2018078339A (ja) | 2018-05-17 |
US20160141397A1 (en) | 2016-05-19 |
US9583601B2 (en) | 2017-02-28 |
JP2021192464A (ja) | 2021-12-16 |
JP2020057819A (ja) | 2020-04-09 |
JP2020047927A (ja) | 2020-03-26 |
US10121903B2 (en) | 2018-11-06 |
US9246011B2 (en) | 2016-01-26 |
US20170162718A1 (en) | 2017-06-08 |
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