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1、SolarCon/CPTICChina,20-22March2012,Shanghai,ChinaDevelopmentTowards20%EfficientN-typeSiMWTSolarCellsForLow-CostIndustrialProductionaaaaaN.Guillevin,B.J.B.Heurtault,B.BVanAken,I.J.Bennett,M.J.Jansen,L.aaabbbBerkeveld,L.J.Geerligs,A.W.Weeber,Huzhiyan,Ligaofei,Zhaowenchao,Wangbbbbbbjianm
2、ing,Wangziqian,Chenyingle,Shenyanlong,Chenjianhui,Yubo,Tianbbshuquan,XiongjingfengaECNSolarEnergy,P.O.Box1,NL-1755ZGPetten,theNetherlandsPhone:+31224564176;Fax:+31224568214;email:guillevin@ecn.nlbYingliSolar,3399ChaoyangNorthStreet,Baoding,ChinaComparedtotraditionalH-patterncells,back
3、-contactMetalWrapThrough(MWT)cellsallowhigherefficiencyatcelllevelthankstothefrontmetallisationcoverage,andhigherefficiencyatmodulelevelthankstothereducedinterconnectionresistancelosses.Wehavedeveloped,incollaborationbetweenECNandYingliSolar,n-typemono-crystallineMWTsolarcelltechnolog
4、yleadingtoefficienciesupto19.7%(in-housemeasurements)onlargeareawafers(239cm²).Inthisarticle,wedemonstratethatefficiencyofMWTcellsreproduciblyexceedsthefrontcontactH-patterncellsbasedontheequivalenttechnologybyabout0.25%absolute.Basedonalossanalysis,wepresentsolutionswhichopenthepossi
5、bilityforfurtherefficiencyincrease.Wealsodescribemoduleresultswhereapproximately3%powerincreasehasbeenobtainedonMWTmoduleoverthecorrespondingH-patterntabbedmodule(273WpforMWTversus265WpforH-patternmodule).Optionstoreducecostandimproveefficiencyatmodulelevelarealsodiscussed.Introductio
6、nThemajorityofsolarcellproductionispresentlybasedonp-typecrystallinesiliconwafersusingtheverymaturedouble-sidecontacted(withanH-patterngrid)technology.However,forasuccessfulandlargescaleintroductionofsiliconPVonthemarket,competitivenesswithotherenergysourceshastobeimproved.Consequentl
7、y,highefficiencyandeaseofmassproduction,preferablycombinedwithloweruseofresourcesandimprovedenvironmentalfootprint,willbethemaindriverstomakeSiliconPValow-cost(cost/Wp)technologyabletocontributetotheriseofrenewableenergies.Back-contactedsolarcellconceptssuchasInterdigitatedBackContact
8、(IBC)
