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1、完形填空第十三篇SolarPowerwithoutSolarCellsAdramaticandsurprisingmagneticeffectoflightdiscoveredbyUniversityofMichigan1researcherscouldleadtosolarpowerwithouttraditionalsemiconductor-basedsolarcells.Theresearchersfoundawaytomakean"optical1,"saidStephenRand,aprofessorinthedepartmentso
2、fElectricalEngineeringandComputerScience,PhysicsandAppliedPhysics.Lighthaselectricandmagneticcomponents.Untilnow,scientiststhoughtthe2ofthemagneticfieldweresoweakthattheycouldbeignored.WhatRandandhiscolleaguesfoundisthatattherightintensity,whenlightistravelingthroughamaterial
3、thatdoesnotconductelectricity,thelightfieldcangeneratemagneticeffectsthatare100milliontimesstrongerthan3expected.4thesecircumstances,themagneticeffectsdevelopstrengthequivalenttoastrongelectriceffect."Thiscouldleadtoanewkindofsolarcellwithoutsemiconductorsandwithoutabsorption
4、toproducechargeseparation,"Randsaid."Insolarcells,the5goesintoamaterial,getsabsorbedandcreatesheat.Here,weexpecttohaveaverylowheatload2.Insteadofthelightbeingabsorbed,energyisstoredinthemagneticmoment3.Intensemagnetizationcanbeinducedbyintenselightandthenitisultimatelycapable
5、ofprovidingacapacitivepower6."Whatmakesthispossibleisapreviouslyundetectedbrandof"opticalrectification4,"saysWilliamFisher,adoctoralstudent5inappliedphysics.Intraditionalopticalrectification,light'selectricfieldcausesachargeseparation,orapulling7ofthepositiveandnegativecharge
6、s6inamaterial.Thissetsupavoltage,similarto8inabattery.RandandFisherfoundthatundertherightcircumstancesandinrighttypesofmaterials,thelight'smagneticfieldcanalsocreateopticalrectification.Thelightmustbeshonethrough7a9thatdoesnot10electricity,suchasglass.Anditmustbefocusedtoanin
7、tensityof10millionwattspersquarecentimeter8.Sunlightisn'tthisintenseonitsown,butnewmaterialsarebeingsoughtthatwouldworkatlowerintensities,Fishersaid."Inourmostrecentpaper,weshowthatincoherentlight9likesunlightistheoreticallyalmostas.11inproducingchargeseparationaslaserlightis
8、,"Fishersaid.Thisnew12couldmakesolarpowercheaper,theresearcherssay.T
