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Zhengguo Xiao, Yongbo Yuan, Bin Yang, Jeremy VanDerslice, Jihua Chen, Ondrej Dyck, Gerd Duscher and Jinsong Huang Universal Formation of Compositionally Graded Bulk Heterojunction for Efficiency Enhancement in Organic Photovoltaics Advanced Materials 26

Version of Record online: 25 FEB 2014 | DOI: 10.1002/adma.201305196

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A universal method is reported to form graded bulk heterojunction (BHJ) organic photovoltaic devices (OPVs) by a simple solvent-fluxing process. Donors are enriched at the anode and acceptors are enriched at cathode side, matching the gradient electron and hole current across the film. Efficiency enhancements by 15–50% are achieved for all BHJ systems tested compared with the optimized regular BHJ OPVs.

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