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Peeled-Off Flexible Cu(In,Ga)Se2 Solar Cells and Na Diffusion Effects on Cell Performances
Adiyudha Sadono,Tomohiro Ogihara,Masashi Hino,Kenji Yamamoto,Akira Yamada 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.4
Na diffusion on Cu(In,Ga)Se2 (CIGS) solar cells fabricated ontop of polyimide-coated soda-lime glass (SLG) substrate wereinvestigated. Polyimide-coated SLG that can be used assubstrate for fabricating flexible solar cells by peeled-offprocess, shown to have the same efficiency with SLG referencewhich is around 12%, indicating diffusion of almost sameamount of Na from the substrates into the CIGS. Additional Naincorporation by NaF post-deposition treatment (PDT) wereapplied to CIGS deposited on substrates with different Naquantity to understand the Na diffusion effect prior and postCIGS deposition. Improvement of cells performance wereobserved for CIGS deposited on both substrates with or withoutNa diffusion. Final conversion efficiency of 15% was achievedafter PDT for CIGS deposited on Na-contained substratessuggesting that PDT can be used even for CIGS with Nadiffusion from the substrate.