A halin yanzu, masana'antar SiC tana canzawa daga 150 mm (inci 6) zuwa 200 mm (inci 8). Don saduwa da buƙatun gaggawa na manyan-size, high quality-SiC homoepitaxial wafers a cikin masana'antu, 150mm da 200mm4H-SiC homoepitaxial wafersan yi nasarar shirya su akan kayan aikin gida ta hanyar amfani da kayan haɓaka mai zaman kansa na 200mm SiC na ci gaban epitaxial. An samar da tsari na homoepitaxial wanda ya dace da 150mm da 200mm, wanda girman girman epitaxial zai iya girma fiye da 60um/h. Duk da yake saduwa da babban saurin epitaxy, ingancin wafer na epitaxial yana da kyau. Daidaitaccen kauri na 150 mm da 200 mmSiC epitaxial wafersza a iya sarrafa a cikin 1.5%, da taro uniformity ne kasa da 3%, da m lahani yawa ne kasa da 0.3 barbashi / cm2, da epitaxial surface roughness tushen nufin square Ra ne kasa da 0.15nm, kuma duk core aiwatar Manuniya ne a ci-gaba matakin na masana'antu.
Silicon Carbide (SiC)yana ɗaya daga cikin wakilan na'urorin semiconductor na ƙarni na uku. Yana da halaye na ƙarfin fashewar filin, ingantacciyar wutar lantarki, babban saurin jikewar wutar lantarki, da ƙarfin juriya mai ƙarfi. Ya haɓaka ƙarfin sarrafa makamashi na na'urorin lantarki kuma yana iya saduwa da bukatun sabis na kayan aikin lantarki na gaba na gaba don na'urorin da ke da iko mai girma, ƙananan ƙananan, yawan zafin jiki, high radiation da sauran matsanancin yanayi. Zai iya rage sarari, rage yawan amfani da wutar lantarki da rage buƙatun sanyaya. Ya kawo sauye-sauye na juyin juya hali ga sabbin motocin makamashi, sufurin jirgin kasa, grid mai wayo da sauran fannoni. Saboda haka, silicon carbide semiconductor an gane a matsayin manufa kayan da zai jagoranci na gaba ƙarni na high-ikon lantarki na'urorin. A cikin 'yan shekarun nan, godiya ga goyon bayan manufofin kasa da kasa kan raya masana'antar semiconductor na ƙarni na uku, an kammala bincike da bunƙasa da gina tsarin masana'antar na'urar SiC mai tsawon mm 150 a kasar Sin, kuma an tabbatar da tsaron sarkar masana'antu bisa tushe. Sabili da haka, mayar da hankali kan masana'antu a hankali ya canza zuwa kula da farashi da inganta ingantaccen aiki. Kamar yadda aka nuna a cikin Tebu 1, idan aka kwatanta da 150 mm, 200 mm SiC yana da ƙimar amfani mafi girma, kuma ana iya ƙara fitar da kwakwalwan wafer guda ɗaya da kusan sau 1.8. Bayan fasahar balagagge, ana iya rage farashin masana'anta na guntu ɗaya da kashi 30%. Ci gaban fasaha na 200 mm hanya ce ta kai tsaye na "rage farashi da haɓaka aiki", kuma shine mabuɗin masana'antar semiconductor na ƙasata don "gudanar da layi ɗaya" ko ma "jagoranci".
Daban-daban da tsarin na'urar Si,SiC semiconductor ikon na'urorinduk ana sarrafa su kuma an shirya su tare da yadudduka na epitaxial a matsayin ginshiƙi. Epitaxial wafers sune mahimman kayan asali don na'urorin wutar lantarki na SiC. Ingancin Layer epitaxial kai tsaye yana ƙayyade yawan amfanin na'urar, kuma farashin sa ya kai kashi 20% na farashin kera guntu. Saboda haka, haɓakar epitaxial shine muhimmiyar hanyar haɗin gwiwa a cikin na'urorin wutar lantarki na SiC. Matsakaicin girman matakin matakin tsarin epitaxial an ƙaddara ta kayan aikin epitaxial. A halin yanzu, matakin mayar da matakin 150mm SiC kayan aikin epitaxial a kasar Sin yana da inganci, amma gaba daya tsarin 200mm ya koma bayan matakin kasa da kasa a lokaci guda. Sabili da haka, don warware bukatun gaggawa da kuma mahimman masana'antu na manyan masana'antu, masana'antar masana'antu ta uku da aka samu nasarar ci gaba a cikin ƙasata, da kuma nazarin tsarin da aka yi. By optimizing da tsari sigogi kamar tsari zafin jiki, m gas kwarara kudi, C / Si rabo, da dai sauransu, da maida hankali uniformity <3%, kauri ba Uniformity <1.5%, roughness Ra <0.2 nm da m lahani yawa <0.3 hatsi / cm2 na 150 mm da 200 mm SiC epitaxial wafers 200 mm SiC epitaxial wafers Epi200 mai zaman kanta da aka samu silicon Jawo epitaxial. Matakin aiwatar da kayan aiki na iya biyan buƙatun shirye-shiryen na'urar wutar lantarki mai ƙarfi na SiC.
1 Gwaji
1.1 Ka'idarSiC epitaxialtsari
Tsarin girma na homoepitaxial na 4H-SiC ya ƙunshi matakai maɓalli guda 2, wato, babban zafin jiki a cikin wurin etching na 4H-SiC substrate da tsari na jigilar sinadari mai kama da juna. Babban manufar substrate in-situ etching shi ne don cire subsurface lalacewar da substrate bayan wafer polishing, saura polishing ruwa, barbashi da oxide Layer, da kuma na yau da kullum atomic mataki tsarin za a iya kafa a kan substrate surface ta etching. Ana yin etching a cikin wurin yawanci a cikin yanayin hydrogen. Dangane da ainihin abubuwan da ake buƙata na tsari, ana iya ƙara ƙaramin adadin iskar gas, kamar hydrogen chloride, propane, ethylene ko silane. Yawan zafin jiki na in-situ hydrogen etching yana gabaɗaya sama da 1 600 ℃, kuma ana sarrafa matsi na ɗakin amsa gabaɗaya a ƙasa 2 × 104 Pa yayin aiwatar da etching.
Bayan da substrate surface aka kunna ta in-situ etching, shi ya shiga high-zazzabi sinadaran tururi tsari tsari, wato, girma tushen (kamar ethylene/propane, TCS/silane), doping source (n-type doping source nitrogen, p-type doping source TMAl), da karin iskar gas kamar hydrogen chloride da ake hawa ta hanyar wani babban hydrogen chloride. Bayan gas reacts a cikin high-zazzabi dauki dakin, wani ɓangare na precursor reacts chemically da adsorbs a kan wafer surface, da kuma guda-crystal kama 4H-SiC epitaxial Layer tare da takamaiman doping maida hankali, takamaiman kauri, kuma mafi girma quality aka kafa a kan substrate surface ta yin amfani da guda-crystal 4H-SiC. Bayan shekaru na binciken fasaha, fasahar homoepitaxial ta 4H-SiC ta girma kuma ana amfani da ita sosai wajen samar da masana'antu. Fasahar homoepitaxial 4H-SiC da aka fi amfani da ita a duniya tana da halaye guda biyu:
(1) Yin amfani da kashe-axis (dangi da <0001> crystal jirgin sama, zuwa ga <11-20> crystal shugabanci) oblique yanke substrate a matsayin samfuri, wani high-tsarki guda-crystal 4H-SiC epitaxial Layer ba tare da ƙazanta an ajiye a kan substrate a cikin nau'i na mataki-flow girma yanayin. Farkon haɓakar homoepitaxial na 4H-SiC ya yi amfani da madaidaicin madaidaicin kristal, wato, <0001> Si jirgin don girma. Girman matakan atomic akan saman madaidaicin madaidaicin kristal yana da ƙasa kuma filaye suna da faɗi. Girman nucleation mai girma biyu yana da sauƙi don faruwa yayin tsarin epitaxy don samar da 3C crystal SiC (3C-SiC). By kashe-axis yankan, high-yawa, kunkuntar terrace nisa atomic matakai za a iya gabatar a kan surface na 4H-SiC <0001> substrate, da kuma adsorbed precursor iya yadda ya kamata isa atomic mataki matsayi tare da in mun gwada da low surface makamashi ta surface yadawa. A mataki, precursor atom / kwayoyin halitta matsayin bonding matsayi ne na musamman, don haka a cikin mataki kwarara girma yanayin, da epitaxial Layer iya daidai gaji Si-C biyu atomic Layer stacking jerin na substrate don samar da guda crystal tare da wannan crystal lokaci kamar substrate.
(2) Ana samun ci gaban epitaxial mai girma ta hanyar gabatar da tushen siliki mai ɗauke da chlorine. A cikin tsarin shigar da tururin sinadarai na al'ada na SiC, silane da propane (ko ethylene) sune manyan tushen haɓaka. A cikin aiwatar da haɓaka haɓakar haɓakar haɓakar haɓakar tushen haɓakar haɓakar haɓakar haɓakar haɓakar haɓakar haɓaka, yayin da ma'aunin ɓangaren ɓangaren siliki ke ci gaba da ƙaruwa, yana da sauƙi don ƙirƙirar gungu na siliki ta hanyar daidaita yanayin yanayin iskar gas, wanda ke rage yawan amfani da tushen silicon. Samuwar gungu na silicon yana iyakance haɓaka haɓakar haɓakar epitaxial sosai. A lokaci guda, gungu na siliki na iya dagula haɓakar haɓakar matakin da haifar da lahani na tsakiya. Don guje wa ƙawancen lokaci na iskar gas mai kama da ƙara haɓakar haɓakar epitaxial, ƙaddamar da tushen siliki na tushen chlorine a halin yanzu shine babbar hanyar haɓaka ƙimar haɓakar epitaxial na 4H-SiC.
1.2 200 mm (8-inch) SiC epitaxial kayan aiki da yanayin tsari
Gwaje-gwajen da aka bayyana a cikin wannan takarda duk an gudanar da su ne a kan katangar zafi mai tsayin 150/200 (6/8-inch) mai dacewa da katanga mai zafi na SiC kayan aikin epitaxial wanda cibiyar 48th Institute of China Electronics Technology Group Corporation ta kirkira. Tanderun epitaxial yana goyan bayan loda wafer cikakke ta atomatik da saukewa. Hoto na 1 shine zane mai zane na tsarin ciki na ɗakin amsawa na kayan aikin epitaxial. Kamar yadda aka nuna a cikin Hoto 1, bangon waje na ɗakin amsawa shine kararrawa ma'adini tare da mai sanyaya ruwa mai sanyaya ruwa, kuma cikin kararrawa shine babban ɗakin amsawar zafin jiki, wanda ya ƙunshi carbon na thermal ji, babban tsafta na musamman graphite cavity, graphite gas-floating rotating base, da dai sauransu An rufe shi da quartz bell tare da quartz. Dakin amsawa a cikin kararrawa yana dumama wutar lantarki ta hanyar matsakaicin mitar shigar da wutar lantarki. Kamar yadda aka nuna a cikin Hoto na 1 (b), iskar gas mai ɗaukar kaya, iskar gas, da iskar doping duk suna gudana ta saman wafer a cikin madaidaicin laminar da ke gudana daga sama na ɗakin amsawa zuwa ƙasan ɗakin amsawa kuma ana fitar da su daga ƙarshen gas ɗin wutsiya. Don tabbatar da daidaito a cikin wafer, wafer ɗin da aka ɗauka ta hanyar iska mai iyo tushe koyaushe yana juyawa yayin aiwatarwa.
Matsakaicin da aka yi amfani da shi a cikin gwaji shine 150 mm na kasuwanci, 200 mm (inci 6, 8 inci) <1120> shugabanci 4 ° kashe-kusurwar gudanarwa n-nau'in 4H-SiC mai fuska biyu mai goge SiC substrate wanda Shanxi Shuoke Crystal ya samar. Ana amfani da Trichlorosilane (SiHCl3, TCS) da ethylene (C2H4) azaman babban tushen haɓakawa a cikin gwajin tsari, waɗanda TCS da C2H4 ana amfani da su azaman tushen silicon da tushen carbon bi da bi, ana amfani da nitrogen mai tsarki (N2) azaman tushen doping na nau'in n, kuma ana amfani da hydrogen (H2) azaman dilution gas da iskar gas. Matsakaicin zafin jiki na tsarin epitaxial shine 1 600 ~ 1 660 ℃, matsin lamba shine 8 × 103 ~ 12 × 103 Pa, kuma H2 mai ɗaukar iskar gas shine 100 ~ 140 L / min.
1.3 Gwajin wafer na Epitaxial da halayyar
Fourier infrared spectrometer (masu sana'a Thermalfisher, model iS50) da mercury bincike maida hankali tester (kayan aiki Semilab, model 530L) aka yi amfani da su nuna ma'ana da rarraba epitaxial Layer kauri da kuma doping maida hankali; An ƙaddara kauri da doping na kowane ma'ana a cikin Layer epitaxial ta hanyar ɗaukar maki tare da layin diamita da ke tsaka da layi na yau da kullum na babban mahimmanci a 45 ° a tsakiyar wafer tare da cire 5 mm gefen. Don wafer na 150 mm, an ɗauki maki 9 tare da layin diamita guda ɗaya (diamita biyu sun kasance daidai da juna), kuma don 200 mm wafer, an dauki maki 21, kamar yadda aka nuna a cikin Hoto 2. An yi amfani da microscope mai karfi na atomatik (mai sana'a Bruker, samfurin Dimension Icon) don zaɓar 30 μm × 30 mm gefen gefen tsakiya da yanki na μm. Epitaxial wafer don gwada yanayin da ake ciki na epitaxial Layer; an auna lahani na epitaxial Layer ta amfani da ma'auni mai lahani (masu sana'a na China Electronics Hoton 3D yana da alamar firikwensin radar (samfurin Mars 4410 pro) daga Kefenghua.
Lokacin aikawa: Satumba-04-2024