TWI570805B - SOI wafer manufacturing method - Google Patents
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- TWI570805B TWI570805B TW101103368A TW101103368A TWI570805B TW I570805 B TWI570805 B TW I570805B TW 101103368 A TW101103368 A TW 101103368A TW 101103368 A TW101103368 A TW 101103368A TW I570805 B TWI570805 B TW I570805B
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- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 claims description 42
- 239000013078 crystal Substances 0.000 claims description 36
- 239000000758 substrate Substances 0.000 claims description 35
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 26
- 229910052732 germanium Inorganic materials 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 18
- 229910052594 sapphire Inorganic materials 0.000 claims description 13
- 239000010980 sapphire Substances 0.000 claims description 13
- 239000010453 quartz Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 238000000151 deposition Methods 0.000 claims description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 239000012808 vapor phase Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 40
- 235000012431 wafers Nutrition 0.000 description 36
- 230000007547 defect Effects 0.000 description 24
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 23
- 229910052707 ruthenium Inorganic materials 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 14
- 238000005498 polishing Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 8
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 5
- 238000005468 ion implantation Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 125000004429 atom Chemical group 0.000 description 3
- 230000009477 glass transition Effects 0.000 description 3
- 238000004518 low pressure chemical vapour deposition Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 239000002320 enamel (paints) Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- -1 oxygen ions Chemical class 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical compound [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000010884 ion-beam technique Methods 0.000 description 1
- 238000005224 laser annealing Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 229910003468 tantalcarbide Inorganic materials 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 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
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- H01L21/18—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
- H01L21/324—Thermal treatment for modifying the properties of semiconductor bodies, e.g. annealing, sintering
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
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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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/02373—Group 14 semiconducting materials
- H01L21/02381—Silicon, silicon germanium, germanium
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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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02524—Group 14 semiconducting materials
- H01L21/02532—Silicon, silicon germanium, germanium
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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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02656—Special treatments
- H01L21/02664—Aftertreatments
- H01L21/02667—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth
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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
- H01L21/18—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
- H01L21/185—Joining of semiconductor bodies for junction formation
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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
- H01L21/20—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
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- 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
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
- H01L21/7624—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology
- H01L21/76251—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using bonding techniques
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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
- H01L29/68—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
- H01L29/78603—Thin film transistors, i.e. transistors with a channel being at least partly a thin film characterised by the insulating substrate or support
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- Crystallography & Structural Chemistry (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Recrystallisation Techniques (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Description
本發明係關於SOI晶圓之製造方法。
用以降低寄生電容、測量裝置之高速化之絕緣層上覆矽(Silicon on Insulator，SOI)晶圓已被廣泛使用。該SOI晶圓中之石英上覆矽(SOQ)、藍寶石上覆矽(SOS)之處理晶圓以絕緣透明晶圓構成之晶圓備受矚目。SOQ係活用石英之高透明性之光電關係，或者活用低的介電損失而被期待於高頻裝置之應用。SOS係以藍寶石構成處理晶圓，故除高透明性及低介電損失以外，亦具有以石英無法獲得之高導熱率，故期待應用於伴有發熱之高頻裝置。
為層合具有高品質之單結晶，理想上係以貼合．轉印法，自塊體之矽晶圓形成矽薄膜。於R面之藍寶石上異質磊晶(heteroepitaxial)成長矽層之方法，或於玻璃上成長非單結晶矽，隨後以雷射退火等提高結晶性之CG矽等已被開發，但貼合法並非優勢方法。
但，為製作SOQ、SOS等晶圓，係貼合熱膨脹率有較大差異之異種材料，故有無法使用SOI晶圓製作中廣泛使用之SOITEC法之問題。
SOITEC法中，貼合兩片晶圓後，為了提高結合強度而必須施加450℃~500℃之熱處理，採用矽作為處理基板之SOI中由於貼合兩片矽晶圓故並無問題，但SOQ、SOS
晶圓在施加熱處理時會有貼合晶圓破裂之問題。矽、石英、藍寶石之膨脹係數分別為2.6×10-6/K、0.56×10-6/K、5.8×10-6/K。
為避免該問題點，一般已知係在貼合前進行表面活性化處理，於貼合後施加較低溫之熱處理，而獲得高的結合強度之方法(參照例如非專利文獻1)。
[非專利文獻1]G.L.Sun.J.Zhan,Q.Y.Tong,S.J.Xie,Y.M.Cai,and S.J.Lu,”Cool Plasma activated Surface in Silicon direct bonding technology”J.de Physique,49(C4),79(1988)
然而，即使在如此低溫處理下製作之SOQ、SOS，亦因製程中之應力等引發且發現之缺陷(坑洞、微小龜裂等)會殘留於矽層內部，而有該等缺陷對裝置特性帶來不良影響之顧慮。獲得與市售SOI晶圓同等之單結晶矽層變得困難。
而且在貼合法中採用單結晶矽層形成用之離子注入法時，容易損傷剝離後形成之單結晶矽層表面。
一般為了使因離子注入等造成之損傷復原而施加熱處理已被充分悉知。例如，將氧離子注入於矽晶圓中，然後
長時間施加高溫(1300℃)左右之熱之SIMOX法。然而該方法需要長時間(6小時~12小時)．高溫之製程，石英並無法耐受該溫度(玻璃轉移溫度為1050℃左右)。又，藍寶石雖然耐熱性優異，但有長時間施加900℃以上之熱處理引起之鋁自藍寶石擴散之顧慮。
本發明鑑於上述現狀，其目的係提供一種利用貼合法，在比較低溫且短時間之處理下減低單結晶矽層之表面及內部產生之缺陷之方法。
為解決該問題，本發明者設計以下之方法。
亦即，本發明中之該貼合基板之製造方法為包含下列步驟之方法：利用貼合法，於選自耐熱溫度為800℃以上之材料之處理基板上形成單結晶矽層，而獲得貼合基板之步驟，於該貼合基板之單結晶矽層上沉積非晶矽之步驟，及，施加800℃以上之熱處理之步驟。
利用本發明之貼合基板之製造方法，尤其於SOQ、SOS等之貼合與矽之熱膨脹率較大差異之材料之基板中，可利用貼合法以比較低溫且短時間之處理減低單結晶矽層之表面及內部產生之缺陷。
以下參考圖式詳細說明本發明。相同構件以相同之符號表示。又，本發明並不受限於以下說明之形態。
本發明方法之一連串步驟示於圖1。
首先，利用貼合法，分別準備在由藍寶石、石英等耐熱溫度為800℃以上之材料選出之處理基板3上形成單結晶矽層5之貼合基板10(步驟a)。
貼合基板之製造方法並無特別限制，可藉由例如貼合處理基板與單結晶矽基板後，(1)在惰性氣體氛圍下於500℃左右進行熱處理，利用結晶之再排列效果與注入之氫氣泡之凝聚效果進行熱剝離之方法；(2)藉由於貼合基板之兩面間產生溫度差，在氫離子注入界面進行剝離之方法；(3)將氫離子(H+)或氫分子離子(H2 +)注入於單結晶矽中之後，以臭氧水處理、UV臭氧處理、離子束處理或電漿處理，活性化處理該單結晶矽之離子注入表面或處理基板之表面並經貼合，在離子注入層界面進行機械剝離及/或光照射剝離(較好為400nm以上700nm以下之雷射光或在該波長區域中具有極大強度之鹵素燈光或氙氣燈光)之方法等而獲得。
所謂耐熱溫度為800℃以上之材料意指即使經800℃之熱處理，亦不會伴有大的變形之狀態的材料。石英等之非晶質材料亦可藉玻璃轉移溫度等定義(石英之玻璃轉移溫度為1050℃附近)。如藍寶石之結晶材料亦可以熔點代替(藍寶石之熔點為2050℃附近)。
處理基板3在可見光區域(400nm以上700mnm)中可
為透明亦可為不透明，除上述藍寶石、石英以外亦可採用例如矽、附氧化膜之矽、碳化矽、氮化鋁。
單結晶矽層5之較佳層厚標準，在經歷後述之研磨步驟時，考慮研磨份可為例如20nm~500nm，未經歷研磨步驟時，可為50nm~600nm。
採用貼合法時，上述單結晶矽層5之表面由於殘留有150nm左右之受損層，故在後述之非晶矽層7之層合之前，較好施加CMP研磨。以研磨去除全部受損層會使膜厚偏差增大，故於實際製程，合理上係以化學蝕刻方法去除大部分，然後以鏡面修飾研磨使表面鏡面化之方法。重要的是儘可能去除表面之受損層，受損層之去除方法(CMP、蝕刻或兩方法併用)經驗上判斷並不左右本發明之有效性。
CMP研磨由於係為了使表面鏡面化而進行，故一般通常進行30nm以上之研磨。
上述CMP研磨及鏡面修飾研磨後，亦可利用RCA洗淨或旋轉洗淨等之濕製程洗淨，及/或UV/臭氧洗淨或HF蒸氣洗淨等乾製程進行洗淨。
經歷上述步驟所得之貼合基板10之單結晶矽層5上殘留有缺陷。因此在單結晶矽層5上被覆堆積非晶矽7(步驟b)。堆積非晶矽7之方法並無特別限制。例如LPCVD法等可一次處理100片~200片之晶圓，故在成本上被認為有利，但採用濺鍍法(PVD)或PECVD法也沒有問題。
此處重要的是期望以貼合法形成作為底層之層之單結晶矽，同時於其上形成之矽層為完全非晶質。堆積之矽中含有多晶矽(多結晶)時，由於堆積層以無規方位存在微小結晶，故該製程無法被熟練發揮。堆積時之溫度條件以不形成多晶矽層之600℃以下較佳。
更好之溫度上限為580℃，較佳之溫度下限為540℃。欲堆積之非晶矽之厚度較好為20nm~500nm之範圍。
使用之氣體種類並無特別限制，但於例如LPCVD法或PECVD中舉例為SiH4等。濺鍍(PVD)法中可使用矽靶材。
成膜壓力雖依隨氣體種類而定，但LPCVD時為200mTorr左右。
接著藉由施加800℃以上之熱處理使非晶矽層7經結晶化成為單結晶矽層5同時成為單結晶矽被覆層9(步驟c)。該過程中，可埋掉(回復)存在於單結晶矽層5表面上之坑洞或微小龜裂等之缺陷，可實現缺陷數之減低。
熱處理溫度之較佳上限係考慮處理基板之耐熱性而定，於處理基板為石英時可未達約1200℃，藍寶石時可未達約1300℃。
熱處理時間就抑制處理基板中所含之原子遷移之觀點等而言，可為例如0.5小時~6小時。
本發明中之該方法藉由明確區分成為底層之單結晶矽層5與非晶矽層7，使非晶矽層7之結晶化容易依循作為
底層之單結晶矽層5之配向進行，故可在較低溫(800~1200℃)獲得高品質之單結晶矽被覆層9。
準備以貼合法製作之SOQ基板。使單結晶矽層之厚度為100nm。晶圓口徑在150mm之厚度下為625μm。將該晶圓浸漬在49%之氟化氫(HF)中5分鐘，然後以純水進行洗滌，以光學顯微鏡(倍率50倍)目視計算在3.0mm×3.0mm之區域中之缺陷數後，予以平均(觀察面內13個位置)，觀察到6.5個/cm2之缺陷。
準備以貼合法製作之SOS基板。使單結晶矽層之厚度為100nm。使BOX層之厚度為200nm。晶圓口徑在150mm之厚度下為600μm。將該晶圓浸漬在49%之氟化氫(HF)中5分鐘，然後以純水進行洗滌，以光學顯微鏡計算缺陷數後，予以平均(觀察面內13個位置)，觀察到14.1個/cm2之缺陷。
準備複數片比較例1中使用之SOQ晶圓。使單結晶矽膜厚成為60nm之方式進行鏡面研磨(CMP)，經洗淨．乾燥後，在200mTorr之壓力於560℃，利用SiH4氣體沉
積40nm之非晶矽。然後，在700℃、800℃、900℃、1000℃、1100℃、1200℃之溫度進行熱處理1小時。該等晶圓與比較例1同樣進行HF浸漬處理，計算缺陷數。結果示於圖2及表1中。
結果在700℃並無缺陷數減低效果，但在800℃以上判斷有效果。但，1200℃處理者觀察到晶圓之變形，故判斷該溫度不適用。
準備複數片比較例2中使用之SOS晶圓。以使單結晶矽膜厚成為60nm之方式進行鏡面研磨(CMP)，經洗淨．乾燥後，在200mTorr之壓力於560℃，利用SiH4氣體沉積40nm之非晶矽。然後，在700℃、800℃、900℃、1000℃、1100℃、1200℃、1300℃之溫度進行熱處理1小時。該等晶圓與比較例2同樣進行HF浸漬處理，且計算缺陷數。結果示於圖3及表2中。
結果在700℃下並無缺陷數減低效果，但在800℃以上判斷有效果。但，1300℃處理者觀察到矽層表面之鋁高污染(>1×1013原子/cm2)。其他者未達1×1012原子/cm2。測定方法係採用ICP-MS法。又，以1小時左右之處理則即使在1300℃以上之熱處理仍可使缺陷回復，但認為係鋁自藍寶石到達矽層者，而判斷為不適當。
準備一片比較例1中使用之SOQ晶圓。以使單結晶矽膜厚成為60nm之方式進行鏡面研磨(CMP)，經洗淨．乾燥後，在200mTorr之壓力於620℃，利用SiH4氣體沉積40nm之多晶矽。在1000℃之溫度進行熱處理1小時。該等晶圓與比較例1同樣進行HF浸漬處理，且計算缺陷數。結果示於圖4。結果與實施例1之1000℃處理者進行比較，觀察到缺陷數高。判斷沉積之膜為多矽晶而不適當。
準備一片比較例2中使用之SOS晶圓。以使單結晶矽膜厚成為60nm之方式進行鏡面研磨(CMP)，經洗淨．乾燥後，在200mTorr之壓力於620℃，利用SiH4氣體沉積40nm之多晶矽(平均粒徑：0.1μm以下)。在1000℃之溫度進行熱處理1小時。該等晶圓與比較例1同樣進行HF浸漬處理，且計算缺陷數。結果示於圖5。結果與實
施例2之1000℃處理者進行比較，觀察到缺陷數高。判斷沉積之膜為多矽晶而不適當。
1‧‧‧SOQ、SOS或SOI晶圓
3‧‧‧處理基板
5‧‧‧單結晶矽層
7‧‧‧非晶矽
9‧‧‧單結晶矽被覆層
10‧‧‧貼合基板
圖1為本發明方法之示意步驟圖。
圖2為顯示在SOQ晶圓中使用本發明方法時之缺陷密度之退火溫度依存性之圖。
圖3為顯示在SOS晶圓中使用本發明方法時之缺陷密度之退火溫度依存性之圖。
圖4為比較例3中比較在SOQ晶圓中使用非晶矽或多晶矽且經退火時之缺陷密度之圖表。
圖5為比較例4中比較在SOS晶圓中使用非晶矽或多晶矽且經退火時之缺陷密度之圖表。
1‧‧‧SOQ、SOS或SOI晶圓
3‧‧‧處理基板
5‧‧‧單結晶矽層
7‧‧‧非晶矽
9‧‧‧單結晶矽被覆層
10‧‧‧貼合基板
Claims (3)
- 一種SOI晶圓之製造方法，其包含利用貼合方法，於選自耐熱溫度為800℃以上之材料之處理基板上形成單結晶矽層，而獲得貼合基板之步驟，於該貼合基板之單結晶矽層上以540~600℃沉積非晶矽之步驟，及施加800℃以上之熱處理之步驟，前述處理基板為石英基板或藍寶石基板，前述非晶矽之沉積為藉由低壓化學氣相成長法，且使用SiH4來進行。
- 如申請專利範圍第1項之SOI晶圓之製造方法，其中前述處理基板為石英基板，前述熱處理溫度未達1200℃。
- 如申請專利範圍第1項之SOI晶圓之製造方法，其中前述處理基板為藍寶石基板，前述熱處理溫度未達1300℃。
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| JP2003324188A (ja) * | 2002-04-30 | 2003-11-14 | Ishikawajima Harima Heavy Ind Co Ltd | 大面積単結晶シリコン基板の製造方法 |
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| JPH01270311A (ja) * | 1988-04-22 | 1989-10-27 | Seiko Epson Corp | 薄膜形成方法 |
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| TWI260747B (en) * | 2005-08-24 | 2006-08-21 | Quanta Display Inc | A method for forming a thin film transistor, and a method for transforming an amorphous layer into a poly crystal layer of a single crystal layer |
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| JPH08250421A (ja) * | 1995-03-10 | 1996-09-27 | Canon Inc | 半導体基板の製造方法および半導体基板 |
| JP2003324188A (ja) * | 2002-04-30 | 2003-11-14 | Ishikawajima Harima Heavy Ind Co Ltd | 大面積単結晶シリコン基板の製造方法 |
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| KR20140005948A (ko) | 2014-01-15 |
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| EP2672508B1 (en) | 2019-06-05 |
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