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ID:14271735
大小:114.50 KB
页数:13页
时间:2018-07-27
《太阳能热光伏发电系统研究与仿真外文翻译》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、太阳能热光伏发电系统研究与仿真外文翻译Introduction11PhotovoltaicEnergyConversion12solarCellsandSolarEnergyConversion13solarCellApplicationsReferences11PHOTOVOLTAICENERGYCONVERSIONPhotovoltaicenergyconversionisthedirectproductionofelectricalenergyintheformofcurrentandvoltagefromelectromagneticielightincludin
2、ginfraredvisibleandultravioletenergyThebasicfourstepsneededforphotovoltaicenergyconversionare1alightabsorptionprocesswhichcausesatransitioninamaterialtheabsorberfromgroundstatetoanexcitedstatetheconversionoftheexcitedstateintoatleastafreenegativeandfreepositive-chargecarrierspairand3discr
3、iminatingtransportmechanismwhichcausestheresultingfreenegative-chargecarrierstomoveinonedirectiontoacon-tactthatwewillcallthecathodeandtheresultingfreepositive-chargecarrierstomoveinanotherdirectiontoacontactthatwewillcalltheanodeTheenergeticphotogeneratednegative-chargecarriersarrivingat
4、thecathoderesultinelectronswhichtravelthroughanexternalpathanelectriccircuitWhiletravelingthispaththeylosetheirenergydoingsomethingusefulatanelectrical"load"andfinallytheyreturntotheanodeofthecellAttheanodeeveryoneofthereturningelectronscompletesthefourthstepofphotovoltaicenergyconversion
5、whichisclosingthecircleby4combiningwithanarrivingpositive-chargecarriertherebyreturningtheabsorbertothegroundstateInsomematerialstheexcitedstatemaybeaphotogeneratedfreeelectron-freeholepairInsuchasituationstep1andstep2coalesceInsomematerialstheexcitedstatemaybeanexcitonInwhichcasesteps1an
6、d2aredistinctAstudyofthevariousman-madephotovoltaicdevicesthatcarryoutthesefourstepsisthesubjectofthistextOurmaininterestisphotovoltaicdevicesthatcanefficientlyconverttheenergyinsunlightintousableelectricalenergySuchdevicesaretermedsolarcellsorsolarphotovoltaicdevicesPhotovoltaicdevicesca
7、nbedesignedtobeeffectiveforelectromagneticspectraotherthansunlightForexampledevicescanbedesignedtoconvertradiatedheatinfraredlightintousableelectricalenergyThesearetermedthermalphotovoltaicdevicesTherearealsodeviceswhichdirectlyconvertlightintochemicalenergyIntheset
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