JP5147923B2 - 非線形素子 - Google Patents
非線形素子 Download PDFInfo
- Publication number
- JP5147923B2 JP5147923B2 JP2010250809A JP2010250809A JP5147923B2 JP 5147923 B2 JP5147923 B2 JP 5147923B2 JP 2010250809 A JP2010250809 A JP 2010250809A JP 2010250809 A JP2010250809 A JP 2010250809A JP 5147923 B2 JP5147923 B2 JP 5147923B2
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- Prior art keywords
- electrode
- oxide semiconductor
- semiconductor layer
- diode
- insulating layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 239000004065 semiconductor Substances 0.000 claims description 335
- 239000000463 material Substances 0.000 claims description 42
- 239000010936 titanium Substances 0.000 claims description 30
- 229910052760 oxygen Inorganic materials 0.000 claims description 29
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 24
- 229910052719 titanium Inorganic materials 0.000 claims description 24
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- 239000011651 chromium Substances 0.000 claims description 14
- 239000011777 magnesium Substances 0.000 claims description 11
- 239000011572 manganese Substances 0.000 claims description 10
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 10
- 229910052721 tungsten Inorganic materials 0.000 claims description 10
- 239000010937 tungsten Substances 0.000 claims description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 8
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- 239000012535 impurity Substances 0.000 description 28
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- 229910005191 Ga 2 O 3 Inorganic materials 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
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- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- OYQCBJZGELKKPM-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O-2].[Zn+2].[O-2].[In+3] OYQCBJZGELKKPM-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- H10D30/67—Thin-film transistors [TFT]
- H10D30/674—Thin-film transistors [TFT] characterised by the active materials
- H10D30/6755—Oxide semiconductors, e.g. zinc oxide, copper aluminium oxide or cadmium stannate
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- H10D30/6704—Thin-film transistors [TFT] having supplementary regions or layers in the thin films or in the insulated bulk substrates for controlling properties of the device
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- H10D30/6728—Vertical TFTs
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- H10D30/6729—Thin-film transistors [TFT] characterised by the electrodes
- H10D30/673—Thin-film transistors [TFT] characterised by the electrodes characterised by the shapes, relative sizes or dispositions of the gate electrodes
- H10D30/6733—Multi-gate TFTs
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- H10D30/6729—Thin-film transistors [TFT] characterised by the electrodes
- H10D30/673—Thin-film transistors [TFT] characterised by the electrodes characterised by the shapes, relative sizes or dispositions of the gate electrodes
- H10D30/6733—Multi-gate TFTs
- H10D30/6734—Multi-gate TFTs having gate electrodes arranged on both top and bottom sides of the channel, e.g. dual-gate TFTs
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- H10D30/6757—Thin-film transistors [TFT] characterised by the structure of the channel, e.g. transverse or longitudinal shape or doping profile
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- H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
- H10D86/421—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs having a particular composition, shape or crystalline structure of the active layer
- H10D86/423—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs having a particular composition, shape or crystalline structure of the active layer comprising semiconductor materials not belonging to the Group IV, e.g. InGaZnO
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- H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
- H10D86/60—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs wherein the TFTs are in active matrices
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- Thin Film Transistor (AREA)
- Semiconductor Integrated Circuits (AREA)
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- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
本実施の形態では、本発明の一形態である酸化物半導体を有する縦型トランジスタを用いた非線形素子について、酸化物半導体がn型である場合について、図1乃至図6を用いて説明する。本実施の形態にて説明する非線形素子は、トランジスタのソース電極またはドレイン電極の一方にゲート電極を接続し、トランジスタをダイオードとして機能させるものである。
G=αn×n×νn+αp×p×νp・・・式2
φms≦χ<φmd・・・式1
本実施の形態では、本発明の一態様である非線形素子の一例であって、実施の形態1とは異なる構造のものについて、図7を用いて説明する。本実施の形態にて説明する非線形素子は、トランジスタのソースまたはドレインの一方にゲートが接続され、ダイオードとして機能するものである。
本実施の形態では、本発明の一態様である非線形素子の一例であって、実施の形態1とは異なる構造のものについて、図9を用いて説明する。本実施の形態にて説明する非線形素子は、トランジスタのソースまたはドレインの一方にゲートが接続され、ダイオードとして機能するものである。
本実施の形態では、図1に示すダイオード接続されたトランジスタの作製工程について、図11を用いて説明する。
本実施の形態では、実施の形態4とは異なる形態の酸化物半導体層を有するダイオード接続されたトランジスタとその作製方法について、図11及び図12を用いて説明する。
本実施の形態では、図1に示すダイオード接続されたトランジスタの作製工程であって、実施の形態4とは異なるものについて、図11を用いて説明する。
上記実施の形態にて説明したダイオードは、半導体装置に適用することができる。半導体装置として、例えば表示装置を挙げることができる。
本実施の形態では、上記実施の形態にて説明したダイオードを用いて、安定した電源供給を可能とする半導体装置の構成例について図15で説明する。電源線に想定以上の電圧が印加されると、その電源線に接続している回路が損傷される恐れがある。上記実施の形態では、主に信号線に対して想定以上の過大な電圧から保護するための構成例について示したが、図15では、電源線に想定以上の電圧が印加されることを防ぐための構成例を示す。
実施の形態7で説明した保護回路を有する表示装置は、電子機器に適用することができる。
103 絶縁層
105 電極
106 電極
107 酸化物半導体層
109 電極
111 ゲート絶縁層
113 電極
115 電極
117 絶縁層
119 コンタクトホール
121 コンタクトホール
123 コンタクトホール
125 配線
129 配線
131 配線
132 配線
133 トランジスタ
141 トランジスタ
143 トランジスタ
145 トランジスタ
Claims (3)
- 第1の電極と、
前記第1の電極上の、In、Ga、Zn及びOを含む酸化物半導体層と、
前記酸化物半導体層上の第2の電極と、
前記第1の電極、前記酸化物半導体層、及び前記第2の電極を覆うゲート絶縁層と、
2つの第3の電極と、を有し、
前記2つの第3の電極のそれぞれは、前記ゲート絶縁層に接して設けられ、
前記2つの第3の電極のぞれぞれは、前記ゲート絶縁層を介して、前記第1の電極、前記酸化物半導体層、及び前記第2の電極の端部を覆い、
前記第3の電極の一方は、前記ゲート絶縁層、前記第1の電極、前記酸化物半導体層、及び前記第2の電極を介して、前記第3の電極の他方と対向し、
前記第3の電極の一方は、前記第3の電極の他方と電気的に接続され、
前記第3の電極は、前記第1の電極または前記第2の電極の一方と電気的に接続され、
前記第1の電極または前記第2の電極のうち、前記第3の電極と電気的に接続された電極の仕事関数φmdと、前記第1の電極または前記第2の電極のうち、前記第3の電極と電気的に接続されていない電極の仕事関数φmsと、前記酸化物半導体層の電子親和力χが、χはφms以上かつφmd未満となるように構成され、
前記第1の電極と前記酸化物半導体層の接触面積と、前記第2の電極と前記酸化物半導体層の接触面積が異なることを特徴とする非線形素子。 - 請求項1において、
前記仕事関数φmdを有する電極は、タングステン(W)、モリブデン(Mo)、クロム(Cr)、鉄(Fe)、金(Au)、プラチナ(Pt)、銅(Cu)、コバルト(Co)、ニッケル(Ni)、ベリリウム(Be)、または酸化インジウム錫(ITO)から選ばれた材料を含むことを特徴とする非線形素子。 - 請求項1または請求項2において、
前記仕事関数φmsを有する電極は、チタン(Ti)、イットリウム(Y)、アルミニウム(Al)、ジルコニウム(Zr)、マグネシウム(Mg)、銀(Ag)、マンガン(Mn)、またはタンタル(Ta)から選ばれた材料を含むことを特徴とする非線形素子。
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