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    Achieving high efficiency and stability in inverted organic solar cells fabricated by laminated gold leaf as top electrodes

    Year: 2014

    Journal: APPLIED PHYSICS EXPRESS, Vol. 7, p -, 20150722

    Authors: Razali, Nur Tahirah; Osaka, Itaru; Takimiya, Kazuo; Vohra, Varun; Murata, Hideyuki

    Organizations: Japan Adv Inst Sci & Technol, Sch Mat Sci, Nomi, Ishikawa 9231211, Japan; RIKEN, CEMS, Wako, Saitama 3510198, Japan; Univ Malaysia Sarawak, Fac Engn, Kota Samarahan 94300, Sarawak, Malaysia

    We investigated inverted bulk heterojunction solar cells fabricated with gold (Au) leaf as laminated top electrodes. We demonstrate that the Au leaf can be successfully transferred from a supporting poly(ethylene terephthalate) (PET) substrate to the surface of poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) because PEDOT:PSS has a sufficiently higher work of adhesion than PET. Under optimized lamination conditions, the contact between the Au leaf and the PEDOT:PSS becomes homogeneous, and the power conversion efficiency (PCE) improves. When a naphtho[1,2-c:5,6-c']bis[1,2,5] thiadiazole-based polymer is used as the p-type semiconductor, the PCE reaches 5.07%. The laminated devices exhibit excellent stability comparable to that of evaporated devices. (C) 2014 The Japan Society of Applied Physics.