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Fabrication of thin film silicon solar cells on plastic substrate by very high frequency PECVD

Fabrication of thin film silicon solar cells on plastic substrate by very high frequency PECVD
Thepaperdescribesthewaytotransferprocesstechnologyofstate-of-the-arthighefficiencythinfilm siliconsolarcellsfabricationoncheapplastic(suchasPETorPEN)substrates,bytwocompletelydifferent approaches:(i)bytransferprocess(Helianthosconcept)ofthinfilmsiliconcellsdepositedathigh substratetemperature, Ts ( 200 1C) and(ii)directdepositionontemperaturesensitivesubstratesatlow Ts ( 100 1C).Adaptationoftheprocessparametersandcellprocessingtotherequirementoftheflexible/ plasticsubstrateisthemostcrucialstep.In-situdiagnosisoftheplasmahasbeendonetounderstandthe effectofinter-electrodedistance,substratetemperatureandhydrogendilutiononthegasphase conditions.Whereas,forthetransferprocess,theinter-electrodedistanceisacriticaldepositioncondition thatneedstobeadaptedfortheflexiblesubstrates,thedirectdepositiononplasticsubstrateshasan addedissueoflossinmaterialqualityandthedepositionrateduetodepositionsatlow Ts. Ourstudies indicatethationenergyiscrucialforobtainingcompactfilmsatlowtemperatureandhighhydrogen dilutionhelpstocompensatethelossofionenergyatlowsubstratetemperatures.Efficienciesof 5.9% and6.2%havebeenobtainedforn–i–ptypea-SicellsonPETandPENsubstrates,respectively,usingdirect deposition.Usinganadaptedinter-electrodedistance,ana-Si/nc-Sitandemcellonplastic(polyester) substratewithanefficiencyof8.1%hasbeenmadebyHelianthoscelltransferprocess.
- Utrecht University Netherlands
Solar cell, Amorphous silicon, Plastic, Nanocrystalline silicon, Thin film, VHF PECVD
Solar cell, Amorphous silicon, Plastic, Nanocrystalline silicon, Thin film, VHF PECVD
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