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1、StatusquoofMetallurgicalPurifiedSolarGradePoly-SiliconanditsQualityAnalysis冶金法太阳能级多晶硅提纯技术现状 与质量分析BradleyShi 史珺上海普罗新能源有限公司ProPowerInc.目录BriefIntroductionofMetallurgicalPurificationofSOG冶金法简介EvolutionofMetallurgicalPurificationofSOG冶金法的进展Impuritiesanditsaff
2、ecttotheSOG太阳能级多晶硅的杂质及其对材料性能的影响QualityStabilityAnalysisofMetallurgicalPurifiedSOG冶金法多晶硅的质量稳定性分析TechnologyforPoly-CrystallinSiliconProduction 多晶硅提纯技术分类ChemicalRoutine化学法ChemicalchangeshappentoSiinpurificationprocess提纯过程中硅发生反应PhysicalRoutine（MetallurgicalRo
3、utine)物理法(冶金法）NochemicalchangehappenstoSiinpurificationprocess提纯过程中硅不发生反应ChemicalRoutine化学法ChemicalchangeshappentoSiinpurificationprocess硅发生了化学反应SiemensRoutine西门子法ModifiedSiemensRoutine改良西门子法MainstreamRoutineatpresent目前的主流工艺RegularPurityis9N常规纯度应可达到9N多晶硅纯
4、度的表示SubstractthecontentofP,B,andMetalsfrom100%用100%扣除磷、硼、金属杂质后的硅的纯度C,O,Nisabout1~10ppm（无需扣除）含有大约1~10ppm级的碳、氧、氮等元素e.g.,7Npolysilicon,maycontain:B:20ppb,P:50ppb,metals:10ppb;andC:1ppm,O:5ppm,N:1ppm（绝对的硅纯度实际为5N）ButcontentofC,O,Ncouldnotexceedthelimit但C、O、N不能
5、过大。太阳能所需要的多晶硅纯度Polysiliconwithpurityhigherthan7Ncouldnotbemadeintosolarcelldirectly7N以上的多晶硅无法用来直接作太阳能电池BorPmustbemixedasdopant须掺入硼或磷ThedopantofBmustbeabout0.25ppm对太阳能来说，硼的掺杂浓度大约在0.25ppmwi.e.,forsolarcell,thepuritymustdownto6Nevenusinga11Npoly-silicon也就是说，
6、在生产太阳能电池时，即便采用11N的高纯硅，也必须掺杂降到6N左右。ImpuritiesandSolarefficiency 杂质对光电转换效率的影响DemandofNewTechnology 新工艺的需求Becauseimpuritiesmustaddedtohighpurepoly-siliconfromSiemensmethod,whichmeansenergydoublewaste采用西门子法得出高纯度的硅后，又要掺杂到6N的纯度，意味着能源的双重浪费That’swhythetechnologyo
7、fpurifyingsilicondirectlyto6Nisbeingexploredallthetime直接生产6N太阳能多晶硅的工艺开始被人们所探索。MetallurgicalRoutinetopurifythepolysiliconisthemostpromisingroutine冶金法是被人探索最多，也是目前最被人看好的工艺。Metallurgical(Physical)Routine 冶金法（物理法）NochemicalchangehappenstoSiinpurificationproces
8、s硅不发生化学反应Hydro-MetallurgicalRoutine湿法冶金法PowdeMetallurgicalRoutine粉末冶金法VacuumRefinery真空熔炼法EnergyBeam(Electron,Ionic)Method能束(电子、离子）法DirectionalSolidification定向凝固OtherMetallurgicalMethods其它冶金法高纯石英直接熔炼、低温熔体萃取等通常的物理冶金法是
