太阳能电池行业英语词汇5.docx
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太阳能电池行业英语词汇5.docx
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太阳能电池行业英语词汇5
EpitaxialGrowth—Thegrowthofonecrystalonthesurfaceofanothercrystal.Thegrowthofthedepositedcrystalisorientedbythelatticestructureoftheoriginalcrystal.
Equalization—Theprocessofrestoringallcellsinabatterytoanequalstate-of-charge.Somebatterytypesmayrequireacompletedischargeasapartoftheequalizationprocess.
EqualizationCharge—Theprocessofmixingtheelectrolyteinbatteriesbyperiodicallyoverchargingthebatteriesforashorttime.
EqualizingCharge—Acontinuationofnormalbatterycharging,atavoltagelevelslightlyhigherthanthenormalend-of-chargevoltage,inordertoprovidecellequalizationwithinabattery.
Equinox—Thetwotimesoftheyearwhenthesuncrossestheequatorandnightanddayareofequallength;usuallyoccursonMarch21st(springequinox)andSeptember23(fallequinox).
ExtrinsicSemiconductor—Theproductofdopingapuresemiconductor.
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F
FermiLevel—Energylevelatwhichtheprobabilityoffindinganelectronisone-half.Inametal,theFermilevelisverynearthetopofthefilledlevelsinthepartiallyfilledvalenceband.Inasemiconductor,theFermilevelisinthebandgap.
FillFactor—Theratioofaphotovoltaiccell'sactualpowertoitspowerifbothcurrentandvoltagewereattheirmaxima.Akeycharacteristicinevaluatingcellperformance.
FixedTiltArray—Aphotovoltaicarraysetinatafixedanglewithrespecttohorizontal.
Flat-PlateArray—Aphotovoltaic(PV)arraythatconsistsofnon-concentratingPVmodules.
Flat-PlateModule—Anarrangementofphotovoltaiccellsormaterialmountedonarigidflatsurfacewiththecellsexposedfreelytoincomingsunlight.
Flat-PlatePhotovoltaics(PV)—APVarrayormodulethatconsistsofnonconcentratingelements.Flat-platearraysandmodulesusedirectanddiffusesunlight,butifthearrayisfixedinposition,someportionofthedirectsunlightislostbecauseofobliquesun-anglesinrelationtothearray.
FloatCharge—Thevoltagerequiredtocounteracttheself-dischargeofthebatteryatacertaintemperature.
FloatLife—Thenumberofyearsthatabatterycankeepitsstatedcapacitywhenitiskeptatfloatcharge.
FloatService—Abatteryoperationinwhichthebatteryisnormallyconnectedtoanexternalcurrentsource;forinstance,abatterychargerwhichsuppliesthebatteryload Float-ZoneProcess—Amethodofgrowingalarge-size,high-qualitycrystalwherebycoilsheatapolycrystallineingotplacedatopasingle-crystalseed.Asthecoilsareslowlyraisedthemolteninterfacebeneaththecoilsbecomessinglecrystal. Float-ZoneProcess—Inreferencetosolarphotovoltaiccellmanufacture,amethodofgrowingalarge-size,high-qualitycrystalwherebycoilsheatapolycrystallineingotplacedatopasingle-crystalseed.Asthecoilsareslowlyraisedthemolteninterfacebeneaththecoilsbecomesasinglecrystal. Frequency—Thenumberofrepetitionsperunittimeofacompletewaveform,expressedinHertz(Hz). FrequencyRegulation—Thisindicatesthevariabilityintheoutputfrequency.Someloadswillswitchoffornotoperateproperlyiffrequencyvariationsexceed1%. FresnelLens—Anopticaldevicethatfocuseslightlikeamagnifyingglass;concentricringsarefacedatslightlydifferentanglessothatlightfallingonanyringisfocusedtothesamepoint. FullSun—Theamountofpowerdensityinsunlightreceivedattheearth'ssurfaceatnoononaclearday(about1,000Watts/squaremeter). BacktoTop G Ga—Seegallium. GaAs—Seegalliumarsenide. Gallium(Ga)—Achemicalelement,metallicinnature,usedinmakingcertainkindsofsolarcellsandsemiconductordevices. GalliumArsenide(GaAs)—Acrystalline,high-efficiencycompoundusedtomakecertaintypesofsolarcellsandsemiconductormaterial. Gassing—Theevolutionofgasfromoneormoreoftheelectrodesinthecellsofabattery.Gassingcommonlyresultsfromlocalactionself-dischargeorfromtheelectrolysisofwaterintheelectrolyteduringcharging. GassingCurrent—Theportionofchargecurrentthatgoesintoelectrolyticalproductionofhydrogenandoxygenfromtheelectrolyticliquid.Thiscurrentincreaseswithincreasingvoltageandtemperature. Gel-TypeBattery—Lead-acidbatteryinwhichtheelectrolyteiscomposedofasilicagelmatrix. Gigawatt(GW)—Aunitofpowerequalto1billionWatts;1millionkilowatts,or1,000megawatts. Grid—Seeelectricalgrid. Grid-ConnectedSystem—Asolarelectricorphotovoltaic(PV)systeminwhichthePVarrayactslikeacentralgeneratingplant,supplyingpowertothegrid. Grid-InteractiveSystem—Sameasgrid-connectedsystem. GridLines—Metalliccontactsfusedtothesurfaceofthesolarcelltoprovidealowresistancepathforelectronstoflowouttothecellinterconnectwires. BacktoTop H HarmonicContent—Thenumberoffrequenciesintheoutputwaveforminadditiontotheprimaryfrequency(50or60Hz.).Energyintheseharmonicfrequenciesislostandmaycauseexcessiveheatingoftheload. Heterojunction—Aregionofelectricalcontactbetweentwodifferentmaterials. HighVoltageDisconnect—Thevoltageatwhichachargecontrollerwilldisconnectthephotovoltaicarrayfromthebatteriestopreventovercharging. HighVoltageDisconnectHysteresis—Thevoltagedifferencebetweenthehighvoltagdisconnectsetpointandthevoltageatwhichthefullphotovoltaicarraycurrentwillbereapplied. Hole—Thevacancywhereanelectronwouldnormallyexistinasolid;behaveslikeapositivelychargedparticle. Homojunction—Theregionbetweenann-layerandap-layerinasinglematerial,photovoltaiccell. HybridSystem—Asolarelectricorphotovoltaicsystemthatincludesothersourcesofelectricitygeneration,suchaswindordieselgenerators. HydrogenatedAmorphousSilicon—Amorphoussiliconwithasmallamountofincorporatedhydrogen.Thehydrogenneutralizesdanglingbondsintheamorphoussilicon,allowingchargecarrierstoflowmorefreely. BacktoTop I IncidentLight—Lightthatshinesontothefaceofasolarcellormodule. IndiumOxide—Awidebandgapsemiconductorthatcanbeheavilydopedwithtintomakeahighlyconductive,transparentthinfilm.Oftenusedasafrontcontactoronecomponentofaheterojunctionsolarcell. InfraredRadiation—Electromagneticradiationwhosewavelengthslieintherangefrom0.75micrometerto1000micrometers;invisiblelongwavelengthradiation(heat)capableofproducingathermalorphotovoltaiceffect,thoughlesseffectivethanvisiblelight. InputVoltage—Thisisdeterminedbythetotalpowerrequiredbythealternatingcurrentloadsandthevoltageofanydirectcurrentloads.Generally,thelargertheload,thehighertheinverterinputvoltage.Thiskeepsthecurrentatlevelswhereswitchesandothercomponentsarereadilyavailable. Insolation—Thesolarpowerdensityincidentonasurfaceofstatedareaandorientation,usuallyexpressedasWattspersquaremeterorBtupersquarefootperhour.Seediffuseinsolationanddirectinsolation. Interconnect—Aconductorwithinamoduleorothermeansofconnectionthatprovidesanelectricalinterconnectionbetweenthesolarcells. IntrinsicLayer—Alayerofsemiconductormaterial,usedinaphotovoltaicdevice,whosepropertiesareessentiallythoseofthepure,undoped,material. IntrinsicSemiconductor—Anundopedsemiconductor. Inverter—Adevicethatconvertsdirectcurrentelectricitytoalternatingcurrenteitherforstand-alonesystemsortosupplypowertoanelectricitygrid. Ion—Anelectricallychargedatomorgroupofatomsthathaslostorgainedelectrons;alossmakestheresultingparticlepositivelycharged;againmakestheparticlenegativelycharged. Irradiance—Thedirect,diffuse,andreflectedsolarradiationthatstrikesasurface.Usuallyexpressedinkilowattspersquaremeter.Irradiancemultipliedbytimeequalsinsolation. ISPRAGuidelines—Guidelinesfortheassessmentofphotovoltaicpowerplants,publishedbytheJointResearchCentreoftheCommissionoftheEuropeanCommunities,Ispra,Italy. I-TypeSemiconductor—Semiconductormaterialthatisleftintrinsic,orundopedsothattheconcentrationofchargecarriersischaracteristicofthematerialitselfratherthanofaddedimpurities. I-VCurve—Agraphicalpresentationofthecurrentversusthevoltagefromaphotovoltaicdeviceastheloadisincreasedfromtheshortcircuit(noload)conditiontotheopencircuit(maximumvoltage)condition.Theshapeofthecurvecharacterizescellperformance. BacktoTop J Joule—Ametricunitofenergyorwork;1joulepersecondequals1wattor0.737foot-pounds;1Btuequals1,055joules. Junction—Aregionoftransitionbetweensemiconductorlayers,suchasap/njunction,whichgoesfromaregionthathasahighconcentrationofacceptors(p-type)toonethathasahighconcentrationofdonors(n-type). JunctionBox—Aphotovoltaic(PV)generatorjunctionboxisanenclosureonthemodulewherePVstringsareelectricallyconnectedandwhereprotectiondevicescanbelocated,ifnecessary. JunctionDiode—Asemiconductordevicewithajunctionandabuilt-inpotentialthatpassescurrentbetterinonedirectionthantheother.Allsolarcellsarejunctiondiodes. BacktoTop K Kilowatt(kW)—Astandardunitofelectricalpowerequalto1000watts,ortotheenergyconsumptionatarateof1000joulespersecond. Kilowatt-Hour(kWh)—1,000thousandwattsact
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