简介：Photovoltaicsarecurrentlyrecognizedasatoprankingtechnologyamongthenewenergies.Photovoltaicshavethepotentialtoeventuallymakeaconsiderablecontributiontothepowergenerationcapacityintheworl,especially,intheindustrializedcoutries.GoodaccomplishmenthasbeenobtainedinthecostreductionofPVsystems,forexamplein1974,systemscost(100-150)$/W.In1981,suchsystemscostlessthan(10-30)$/W,andnowtheycostlessthan5$/W.However,moreR&Deffortsarestillnecessary,toachievelarge-scalecost-effectiveprouctionofPVsystemstomakeitcompetitivewithdieselgenerationofelectricity,althoughPVsystemshaveproventobecompetitiveinruralandremoteareas.Inthispaper,anoverviewonhighefficiencysolarcelltechnologicswilllbepresented.