Inverted Bulk-Heterojunction Solar Cells on a PEDOT:PSS-Coated PEN Substrate with PFN as a Cathode Buffer Layer

Kosei HASHIBA  Shunjiro FUJII  Hiromichi KATAURA  Yasushiro NISHIOKA  

IEICE TRANSACTIONS on Electronics   Vol.E99-C   No.5   pp.555-558
Publication Date: 2016/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E99.C.555
Type of Manuscript: BRIEF PAPER
BHJ solar cell,  PTB7,  PC71BM,  PFN,  

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Organic solar cells are expected to have superior performance in terms of flexibility and low-cost fabrication. However, conventional organic solar cells usually have issues while using rare earth ITO materials and have poor long-term reliability. To seek possible solutions for these issues, we fabricated an inverted solar cell structure of PEN/PEDOT:PSS/PFN/PTB7:PC71BM/MoO3/Au, and found that the fabricated devices had considerably improved long-term reliability when stored in air without any surface passivation layer. The resultant conversion efficiency of the solar cell was 1.88%, and it decreased to 90% of its initial value after 100 h of storage in air.