TWI577032B - 顯示裝置 - Google Patents
顯示裝置 Download PDFInfo
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- TWI577032B TWI577032B TW104113169A TW104113169A TWI577032B TW I577032 B TWI577032 B TW I577032B TW 104113169 A TW104113169 A TW 104113169A TW 104113169 A TW104113169 A TW 104113169A TW I577032 B TWI577032 B TW I577032B
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- Prior art keywords
- layer
- tin
- metal oxide
- oxide semiconductor
- display device
- Prior art date
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- 239000004065 semiconductor Substances 0.000 claims description 41
- 229910044991 metal oxide Inorganic materials 0.000 claims description 38
- 150000004706 metal oxides Chemical class 0.000 claims description 38
- 239000010409 thin film Substances 0.000 claims description 37
- 229910052718 tin Inorganic materials 0.000 claims description 31
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 28
- 229910052733 gallium Inorganic materials 0.000 claims description 22
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 21
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- 239000000758 substrate Substances 0.000 claims description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- 229910052738 indium Inorganic materials 0.000 claims description 19
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical group [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 239000011701 zinc Substances 0.000 claims description 13
- 239000010949 copper Substances 0.000 claims description 12
- 239000010936 titanium Substances 0.000 claims description 12
- 229910052725 zinc Inorganic materials 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 8
- 229910052732 germanium Inorganic materials 0.000 claims description 7
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 4
- KYKLWYKWCAYAJY-UHFFFAOYSA-N oxotin;zinc Chemical compound [Zn].[Sn]=O KYKLWYKWCAYAJY-UHFFFAOYSA-N 0.000 claims description 4
- 239000011787 zinc oxide Substances 0.000 claims description 3
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 141
- 238000000034 method Methods 0.000 description 58
- 238000005530 etching Methods 0.000 description 25
- 238000001459 lithography Methods 0.000 description 19
- 239000010408 film Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 229920002120 photoresistant polymer Polymers 0.000 description 10
- 238000000059 patterning Methods 0.000 description 8
- 238000004544 sputter deposition Methods 0.000 description 8
- 238000005229 chemical vapour deposition Methods 0.000 description 7
- 238000005240 physical vapour deposition Methods 0.000 description 7
- 238000001039 wet etching Methods 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 6
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- -1 or the like Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 206010021143 Hypoxia Diseases 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 229910052735 hafnium Inorganic materials 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 238000004380 ashing Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000001312 dry etching Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 2
- 239000001272 nitrous oxide Substances 0.000 description 2
- 235000006408 oxalic acid Nutrition 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- RPAJSBKBKSSMLJ-DFWYDOINSA-N (2s)-2-aminopentanedioic acid;hydrochloride Chemical class Cl.OC(=O)[C@@H](N)CCC(O)=O RPAJSBKBKSSMLJ-DFWYDOINSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- DZUUPHFYCRDYAM-UHFFFAOYSA-N [Sn]=O.[Zn].[Sb].[In] Chemical compound [Sn]=O.[Zn].[Sb].[In] DZUUPHFYCRDYAM-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 238000000231 atomic layer deposition Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910000449 hafnium oxide Inorganic materials 0.000 description 1
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 description 1
- 229910003471 inorganic composite material Inorganic materials 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 1
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005477 sputtering target Methods 0.000 description 1
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- 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
- H01L29/78696—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
-
- 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
-
- 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
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/24—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only semiconductor materials not provided for in groups H01L29/16, H01L29/18, H01L29/20, H01L29/22
-
- 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
- H01L29/66007—Multistep manufacturing processes
- H01L29/66969—Multistep manufacturing processes of devices having semiconductor bodies not comprising group 14 or group 13/15 materials
-
- 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
- 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
- H01L29/7869—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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Ceramic Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Thin Film Transistor (AREA)
Description
本發明係關於顯示裝置,更特別關於其薄膜電晶體結構之通道層組成。
顯示器主要包含薄膜電晶體及其他電子元件。在薄膜電晶體的結構中,半導體層的材料主要為非晶矽(Amorphous silicon,a-Si)。但隨著技術發展,上述半導體層的材料漸漸轉變為金屬氧化物,其中又以銦鎵鋅氧化物(IGZO)具有較佳的電子遷移率。然而以IGZO半導體層作為通道層的薄膜電晶體之製程中,一般濕蝕刻製程中之蝕刻液(例如鋁酸(Al acid)),對於半導體層材料銦鎵鋅氧化物(IGZO)和用於源極與汲極材料如含鋁之多層結構(Mo/Al/Mo)的蝕刻選擇比極低。換言之,圖案化源極與汲極之蝕刻製程同樣會蝕刻IGZO通道層,甚至造成IGZO通道層因過度蝕刻而小於IGZO通道層預期的厚度,而導至薄膜電晶體電性不佳而無法正常操作。
綜上所述,目前亟需新的通道層組成,以避免上述蝕刻源極與汲極之製程同時蝕刻IGZO通道層,而使薄膜電晶體無法正常操作的問題。
本發明一實施例提供之顯示裝置,包含薄膜電晶
體結構,包括:通道層,該通道層包括第一金屬氧化物半導體層,且第一金屬氧化物半導體層之組成包含(1)錫與(2)鎵、鉿、與鋁中至少一者。
10‧‧‧薄膜電晶體基板
11、21‧‧‧閘極
13、23‧‧‧閘極絕緣層
15‧‧‧IGZO通道層
17A、27A‧‧‧源極
17B、27B‧‧‧汲極
19‧‧‧凹陷
20‧‧‧基板
25‧‧‧通道層
25'‧‧‧金屬氧化物半導體層
30‧‧‧液晶層
50‧‧‧彩色濾光基板
第1圖係一薄膜電晶體結構之剖視圖。
第2A至2D圖係本發明一實施例中,薄膜電晶體之製程剖視圖。
第3圖係本發明一實施例中,薄膜電晶體之剖視圖。
第4圖係一顯示裝置。
第4圖係一顯示裝置如液晶顯示裝置,其包含薄膜電晶體基板10、液晶層30、及彩色濾光基板50。第1圖係於薄膜電晶體基板10上形成薄膜電晶體結構之剖視圖。薄膜電晶體基板10上依序為閘極11、閘極絕緣層13、與IGZO通道層15。源極17A與汲極17B分別位於IGZO通道層15的兩側,並延伸至閘極絕緣層13上。源極17A與汲極17B之形成方法如下:形成金屬層(未圖示)如Mo/Al/Mo之三層結構於IGZO通道層15及閘極絕緣層上。接著以微影製程形成遮罩層(未圖示)覆蓋欲保留之金屬層,再以含鋁酸之蝕刻液蝕刻遮罩層未覆蓋之Mo/Al/Mo之金屬層,即形成源極17A與汲極17B。上述製程的問題在於蝕刻液除了移除遮罩層未覆蓋之金屬層外,也會蝕刻IGZO通道層15以形成凹陷19。在最惡劣的情況下,凹陷19
可能穿透整層IGZO通道層15而使其無法作為通道層。在習知製程中,多在IGZO通道層15上額外形成保護層以避免定義源極17A與汲極17B之蝕刻製程影響IGZO通道層15,但此保護層需要額外光罩與工序而增加成本。
為解決上述問題,本發明一實施例提供包含薄膜電晶體結構的顯示裝置,電晶體結構的形成方法如第2A至2D圖所示。在第2A圖中,形成閘極21於基板20上。基板20可為透光(如玻璃、石英、或類似物)或不透光(如晶圓、陶瓷、金屬、金屬合金或類似物)之剛性無機材質,亦可為塑膠、橡膠、聚酯、或聚碳酸酯等可撓性有機材質,亦可為有機/無機之複合材質或上述材質之複數疊合結構。在某些實施例中的基板20採用透光材質,最後形成的薄膜電晶體陣列基板可應用於穿透式、反射式、半穿透半反射式液晶顯示器、或自發光型顯示器。在其他實施例中的薄膜電晶體基板10採用不透光或透光性不佳的材質,形成的薄膜電晶體應用於反射式液晶顯示器或自發光型顯示器。
在本發明一實施例中,閘極21的形成方法包括沉積導電層於基板20上,再圖案化導電層以形成閘極21。在本發明一實施例中,閘極21之厚度介於100nm~1500nm之間。在另一實施例中,閘極21之厚度介於300nm~1000nm之間。閘極21之厚度可依據產品需求而調整。若閘極21之厚度過厚,則薄膜與蝕刻產能受到影響,且閘極21側邊的傾角(Taper)與臨界尺度(Critical Dimension,CD)調整不易。若閘極21之厚度過薄,則閘極訊號容易失真,影響面板操作。導電層之材質
可為金屬、合金、或上述之多層結構。在某些實施例中,導電層為鉬、鋁、銅、鈦、金、銀等單層或多層材料之組合或其合金。上述導電層之形成方法可為物理氣相沉積法(PVD)、化學氣相沉積法(CVD)、濺鍍法、或類似方法。在本發明一實施例中,圖案化導電層以形成閘極21的方法包含微影製程與蝕刻製程。微影製程一般包含下述步驟:塗佈光阻、軟烘烤、對準光罩、曝光、曝光後烘烤、顯影、沖洗、乾燥如硬烘烤、其他合適製程、或上述之組合。光阻的塗佈方法可為旋轉式、狹縫式、滾筒式、噴墨式、或噴霧式等塗佈法。上述微影製程可形成圖案化光阻。移除部份導電層之蝕刻製程可採用圖案化光阻作為遮罩,進行乾蝕刻、濕蝕刻、或上述之組合。在形成閘極21後需移除圖案化光阻,其移除方式可為乾式灰化或濕式剝除。
接著如第2B圖所示,沉積閘極絕緣層23於基板20與閘極21上。在本發明一實施例中,閘極絕緣層23之厚度介於100nm~1500nm之間。在本發明另一實施例中,閘極絕緣層23之厚度介於300nm~1000nm之間。閘極絕緣層23之厚渡可依產品需求進行調整。若閘極絕緣層23之厚度過厚,則薄膜電晶體充電能力下降。若閘極絕緣層23之厚度過薄,則閘極走線與訊號線(data line)電容偶合過大,訊號容易失真。閘極絕緣層23之形成方法可為化學氣相沉積、物理氣相沉積、原子層沉積、濺鍍、或類似方法。閘極絕緣層23可為氧化矽、氮化矽、氮氧化矽、氧化鋁、氧化鑭、氧化鉿、氮氧化鉿、氧化鋯、其他合適材料,或上述單層材料堆疊之多層結構。
接著如第2C圖所示,形成通道層25於閘極絕緣層23上,且通道層25對應閘極21。在本發明一實施例中,通道層25的形成方法為形成金屬氧化物半導體層於閘極絕緣層25上,再圖案化金屬氧化物半導體層以形成通道層25。在本發明一實施例中,通道層25之厚度介於10nm~160nm之間。在本發明另一實施例中,通道層25之厚度介於30nm~100nm之間。若通道層25之厚度過厚,則薄膜電晶體容易有漏電流過大之問題。若通道層25之厚度過薄,則薄膜電晶體充電能力會降低。在本發明一實施例中,通道層25之金屬氧化物半導體包含(1)錫與(2)鎵、鉿、與鋁中至少一者。舉例來說,通道層25係銦鎵鋅錫氧化物(IGZTO,即包含In、Ga、Zn、Sn、O之化合物)。上述IGZTO中錫與銦之原子比例可介於1:1至1:1.5之間。若銦之比例過高,則薄膜電晶體雖然充電能力上升,但是容易造成薄膜電晶體漏電流過大之問題。若銦之比例過低,將造成薄膜電晶體充電能力低落。上述IGZTO中錫與鎵之原子比例可介於1:2至1:2.5之間。若鎵之比例過高,則薄膜電晶體充電能力過低。若鎵之比例過低,則薄膜電晶體氧缺陷容易增加,有漏電流過大之問題。上述IGZTO中錫與鋅之原子比例可介於1:3至1:4之間。若鋅之比例過高,則薄膜電晶體充電能力降低。若鋅之比例過低,則金屬氧化物半導體可能形成結晶,影響電性均勻性。上述IGZTO中錫與氧之原子比例可介於1:7至1:10之間。若氧之比例過高,則薄膜電晶體氧缺陷過低,使充電能力下降。若氧之比例過低,則薄膜電晶體氧缺陷偏高,雖然充電能力較高,但是容易有漏電流過
大之問題。在上述範圍中,IGZTO各元素比例可為錫與銦之原子比例可介於1:1.2至1:1.4之間。錫與鎵之原子比例可介於1:2.1至1:2.3之間。錫與鋅之原子比例可介於1:3.3至1:3.6之間。錫與氧之原子比例可介於1:8至1:9.5之間。在又一實施例中,IGZTO各元素的原子比例為In:Ga:Zn:Sn:O=1.3:2.2:3.5:1:9。
在本發明另一實施例中,通道層25之金屬氧化物半導體也可以是銦鉿鋅錫氧化物(IHZTO,即包含In、Hf、Zn、Sn、O之化合物)。上述IHZTO中錫與銦之原子比例可介於1:1至1:1.5之間。上述IHZTO中錫與鉿之原子比例可介於1:2至1:2.5之間。上述IHZTO中錫與鋅之原子比例可介於1:3至1:4之間。上述IHZTO中錫與氧之原子比例可介於1:7至1:10之間。
在本發明另一實施例中,通道層25之金屬氧化物半導體也可以是銦鋁鋅錫氧化物(IAZTO,即包含In、Al、Zn、Sn、O之化合物)。上述IAZTO中錫與銦之原子比例可介於1:1至1:1.5之間。上述IAZTO中錫與鋁之原子比例可介於1:2至1:2.5之間。上述IAZTO中錫與鋅之原子比例可介於1:3至1:4之間。上述IAZTO中錫與氧之原子比例可介於1:7至1:10之間。
上述通道層25中不同元素的原子比例取決於金屬氧化物半導體之製程參數。舉例來說,若採用濺鍍法形成金屬氧化物半導體,即使採用相同的靶材(比如銦鎵鋅錫氧化物(IGZTO)),也可調整濺鍍製程之參數(如氣體流速、功率、及/或抽氣速率)調整錫與銦、鎵、鋅、及氧之原子比例。在本發明一實施例中,以銦鎵鋅錫氧化物靶材作為濺鍍靶材,以
六代線機台為例,調整濺鍍腔室中的壓力為0.2Pa~0.7Pa之間,調整基板溫度為室溫至200℃之間、調整氣體氬(Ar)流速為200~500sccm之間,調整射頻功率為30~70KW之間,並調整O2流速為10~100sccm之間,使通道層具有合適之元素原子比。
圖案化金屬氧化物半導體層以形成通道層25的方法包含微影製程與蝕刻製程。微影製程如前述,在此不贅述。移除部份金屬氧化物半導體層之蝕刻製程,可採用微影製程形成之圖案化光阻作為遮罩進行濕蝕刻。以IGZTO之金屬氧化物半導體層為例,其濕蝕刻所用之蝕刻液包含草酸。在定義通道層25後需移除圖案化光阻,其移除方式可為乾式灰化或濕式剝除。
接著如第2D圖所示,形成源極27A與汲極27B分別接觸通道層25之兩側,且源極27A與27B分別延伸至閘極絕緣層23上。在本發明一實施例中,源極27A與27B的形成方法係形成導電層於通道層25與閘極絕緣層23上,再圖案化導電層以形成源極27A與汲極27B。在本發明一實施例中,導電層、源極27A、與汲極27B之厚度介於100nm~1500nm之間,較佳為300nm~1000nm,並可根據產品需求而調整。若導電層、源極27A、與汲極27B之厚度過厚,則薄膜與蝕刻產能受到影響,且源極27A/汲極27B側邊的傾角(Taper)與臨界尺度(Critical Dimension,CD)調整不易。若導電層、源極27A、與汲極27B之厚度過薄,則訊號容易失真,影響面板操作。在本發明一實施例中,導電層、源極27A、與汲極27B之組成含鋁,比如Mo/Al/Mo之三層結構。上述含鋁導電層之形成方法可為物理
氣相沉積、濺鍍、或類似方法。在本發明一實施例中,圖案化含鋁導電層以形成源極27A與汲極27B的方法包含微影製程與蝕刻製程。微影製程如前述,在此不贅述。移除部份含鋁導電層之蝕刻製程可採用微影製程形成之圖案化光阻作遮罩,以含鋁酸之蝕刻液進行濕蝕刻。
在本發明另一實施例中,導電層、源極27A、與汲極27B之組成含銅,比如Cu/Ti或Cu/Mo之雙層結構。上述含銅導電層之形成方法可為物理氣相沉積、濺鍍、或類似方法。在本發明一實施例中,圖案化含銅導電層以形成源極27A與汲極27B的方法包含微影製程與蝕刻製程。微影製程如前述,在此不贅述。移除部份含銅導電層之蝕刻製程可採用微影製程形成之圖案化光阻作遮罩,以含過氧化氫之蝕刻液進行濕蝕刻。
在本發明另一實施例中,導電層、源極27A、與汲極27B之組成含鈦,比如Al/Ti或Cu/Ti之雙層結構。上述含鈦導電層之形成方法可為物理氣相沉積、濺鍍、或類似方法。在本發明一實施例中,圖案化含鈦導電層以形成源極27A與汲極27B的方法包含微影製程與蝕刻製程。微影製程如前述,在此不贅述。移除部份含鈦導電層之蝕刻製程可採用微影製程形成之圖案化光阻作遮罩,以含過氧化氫之蝕刻液進行濕蝕刻,並進一步進行乾蝕刻。
由於前述之通道層25之組成包含(1)錫與(2)鎵、鉿、與鋁中至少一者(比如IGZTO),上述定義源極27A與汲極27B之蝕刻步驟不會影響通道層25,即不形成第1圖所示之凹
陷19,並改善薄膜電晶體的效能。
在本發明另一實施例中,可進一步形成另一金屬氧化物半導體層31於通道層25下方,如第3圖所示,即金屬氧化物半導體層31位於通道層25及閘極絕緣23之間。另一金屬氧化半導體層31可視作通道層的一部份。在本發明一實施例中,金屬氧化物半導體層31之厚度介於5nm~30nm之間。在本發明另一實施例中,金屬氧化物半導體層31之厚度介於7nm~25nm之間。若金屬氧化物半導體層31之厚度過厚,則薄膜電晶體有漏電流過大之風險。在本發明一實施例中,金屬氧化物半導體層31之組成包含鎵、鉿、與鋁中至少一者,比如IGZO。在本發明另一實施例中,金屬氧化物半導體層31之組成不含鎵、鉿、或鋁,比如銦錫氧化物(ITO)或銦鋅氧化物(IZO)。不論金屬氧化物半導體31之組成為何,其形成方法均為形成金屬氧化物半導體層(用以定義金屬氧化物半導體層31)於閘極絕緣23上,再形成另一金屬氧化物半導體層(用以定義通道層25)於前述之金屬氧化物半導體層上,再進行微影製程與蝕刻製程如前述,即可同時定義金屬氧化物半導體層31與通道層25。
以上第1、2A~2D或3圖中的各元件之間的堆疊結構、步驟與相對位置的關係僅是為了方便說明所繪製的示意圖,但並不以此為限,熟習該項技術者依據佈線的情況改變各元件之間的堆疊結構、步驟與相對位置的關係皆在本發明的保護範圍內。
本發明以製作IGZTO為例所進行的實驗例如下:
完成閘極以及閘極絕緣層後,以六代線機台為例,30~70KW(以PVD製程為例)之低功率射頻激發氬氣/氧氣流(流速為300sccm/30sccm)形成含氬離子/氧離子之電漿,轟擊IGZTO靶材後沉積約50nm厚之IGZTO膜於基材上,完成微影製程後以草酸進行蝕刻。完成IGZTO圖形化以後,進行源極以及汲極沉膜黃光微影,以鋁(Al)酸(也可使用磷酸/硝酸/醋酸)進行源極/汲極圖形化,此時IGZTO同時受到鋁酸蝕刻,其蝕刻率小於1nm/s,而後以X射線光電子能譜儀(X-ray photoelectron spectroscopy,XPS)測得IGZTO膜之各原子比例。
本發明以相同的實驗條件分別製作以IGZTO膜及IGZO膜為通道層的兩種薄膜電晶體進行比較,並透過掃描式電子顯微鏡(SEM)觀察以IGZTO膜為通道層的薄膜電晶體,其通道層的厚度大約為50nm;而以IGZO膜為通道層的薄膜電晶體,其通道層幾乎被鋁(Al)酸蝕刻殆盡。
另外,第1表的4個實驗例主要用以說明將一覆蓋層(passivation,未繪示)形成在源極/汲極及通道層表面時,以4個實驗條件對覆蓋層進行處理之後,測得IGZTO各原子比例的變化。由第1表可知,在這些變化的實驗條件之下,IGZTO各原子比例仍滿足本發明前述所揭露的範圍。
實驗例1實驗條件:覆蓋層採用介於3~7KW較低功率(以CVD製程為例)範圍之製程條件,降低通道層損害程度。
實驗例2實驗條件:覆蓋層採用大於7KW較高功率(以CVD製程為例)範圍之製程條件,增加通道層損害程度。
實驗例3實驗條件:覆蓋層採用介於3~7KW較低功率(以CVD製程為例)範圍之製程條件,降低通道層損害程度。且在覆蓋層沉積前額外增加一氧化二氮處理,以確認該額外處理對薄膜電晶體元件操作之影響效果。
實驗例4實驗條件:覆蓋層採用大於7KW較高功率(以CVD製程為例)範圍之製程條件,增加通道層損害程度。且在覆蓋層沉積前額外增加一氧化二氮處理,以確認該額外處理對薄膜電晶體元件操作之影響效果。
由上述可知,本發明將特定元素依比例摻入之金屬氧化物半導體層以作為通道層,可抵抗常用於形成定義源極與汲極之濕式蝕刻液(如鋁酸與過氧化氫),進而避免通道層因過度蝕刻而小於通道層預期的厚度,而使元件無法正常操作的問題。
雖然本發明已以數個實施例揭露如上,然其並非用以限定本發明,任何本技術領域中具有通常知識者,在不脫離本發明之精神和範圍內,當可作任意之更動與潤飾,因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。
20‧‧‧基板
21‧‧‧閘極
23‧‧‧閘極絕緣層
25‧‧‧通道層
27A‧‧‧源極
27B‧‧‧汲極
Claims (10)
- 一種顯示裝置,包含:一薄膜電晶體結構,且該薄膜電晶體結構包括一通道層,其中該通道層包括一第一金屬氧化物半導體層,且該第一金屬氧化物半導體層係銦鎵鋅錫氧化物(IGZTO),其中錫與銦之原子比例介於1:1至1:1.5之間,錫與鎵之原子比例介於1:2至1:2.5之間,錫與鋅之原子比例介於1:3至1:4之間,且錫與氧之原子比例介於1:7至1:10之間。
- 如申請專利範圍第1項所述之顯示裝置,更包括:一基板;一閘極,位於該基板上;一閘極絕緣層,位於該基板與該閘極上,該通道層位於該閘極絕緣層上並對應該閘極;以及一源極與一汲極,分別接觸該通道層的兩側並延伸至該閘極絕緣層上。
- 如申請專利範圍第1項所述之顯示裝置,其中錫與銦之原子比例介於1:1.2至1:1.4之間,錫與鎵之原子比例介於1:2.1至1:2.3之間,錫與鋅之原子比例介於1:3.3至1:3.6之間,且錫與氧之原子比例介於1:8至1:9.5之間。
- 如申請專利範圍第1項所述之顯示裝置,其中該通道層更包括一第二金屬氧化物半導體層介於該第一金屬氧化物半導體層與該閘極絕緣層之間。
- 如申請專利範圍第4項所述之顯示裝置,其中該第二金屬氧化物半導體層之組成包含鎵、鉿、與鋁中至少一者。
- 如申請專利範圍第5項所述之顯示裝置,其中該第二金屬氧化物半導體層包括銦鎵鋅氧化物(IGZO)。
- 如申請專利範圍第4項所述之顯示裝置,其中該第二金屬氧化物半導體層之組成不含鎵、鉿、或鋁。
- 如申請專利範圍第7項所述之顯示裝置,其中該第二金屬氧化物半導體層包括銦錫氧化物(ITO)或銦鋅氧化物(IZO)。
- 如申請專利範圍第2項所述之顯示裝置,其中該源極與該汲極之組成含鋁、銅、或鈦。
- 如申請專利範圍第2項所述之顯示裝置,其中該源極與該汲極為Mo/Al/Mo之三層結構、Cu/Ti之雙層結構、Cu/Mo之雙層結構、Al/Ti之雙層結構、或Cu/Ti之雙層結構。
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CN109148592B (zh) * | 2017-06-27 | 2022-03-11 | 乐金显示有限公司 | 包括氧化物半导体层的薄膜晶体管,其制造方法和包括其的显示设备 |
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