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Open AccessArticle

Efficient Inverted Organic Solar Cells Based on a Fullerene Derivative-Modified Transparent Cathode

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Institute of Biomedical Materials and Engineering, College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China
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Laboratory for New Fiber Materials and Modern Textile, Growing Base for State Key Laboratory, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China
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Beijing National Laboratory for Molecular Sciences and Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
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Author to whom correspondence should be addressed.
Materials 2017, 10(9), 1064; https://doi.org/10.3390/ma10091064
Received: 18 July 2017 / Revised: 23 August 2017 / Accepted: 7 September 2017 / Published: 11 September 2017
Indium tin oxide (ITO) is a transparent conductive material which is extensively used in organic solar cells (OSCs) as electrodes. In inverted OSCs, ITO is usually employed as a cathode, which should be modified by cathode buffer layers (CBLs) to achieve better contact with the active layers. In this paper, an amine group functionalized fullerene derivative (DMAPA-C60) is used as a CBL to modify the transparent cathode ITO in inverted OSCs based on PTB7 as a donor and PC71BM as an acceptor. Compared with traditional ZnO CBL, DMAPA-C60 exhibited comparable transmittance. OSCs based on DMAPA-C60 show much better device performance compared with their ZnO counterparts (power conversion efficiencies (PCEs) improved from 6.24 to 7.43%). This is mainly because a better contact between the DMAPA-C60 modified ITO and the active layer is formed, which leads to better electron transport and collection. Nanoscale morphologies also demonstrate that the surface of DMAPA-C60-modified ITO is plainer than the ZnO counterparts, which also leads to the better device performance. View Full-Text
Keywords: organic solar cell (OSC); cathode buffer layer (CBL); transparent conducting material; fullerene derivative; ZnO organic solar cell (OSC); cathode buffer layer (CBL); transparent conducting material; fullerene derivative; ZnO
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MDPI and ACS Style

Wang, Y.; Cong, H.; Yu, B.; Zhang, Z.; Zhan, X. Efficient Inverted Organic Solar Cells Based on a Fullerene Derivative-Modified Transparent Cathode. Materials 2017, 10, 1064.

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