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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...
A conducting diblock copolymer of PS‐b‐P3HT was added to serve as a compatibilizer in a P3HT/PCBM blend, which improved the power‐conversion efficiency from 3.3% to 4.1% due to the enhanced crystallinity, morphology, interface interaction, and depth profile of PCBM.
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