Abstract
The packing effects induced by the hydrophilic ethylene glycol oligomer side chains occurred in a P3HT:PC61BM mixture upon the addition of small amounts of BP93 (containing 7mol% PEGT blocks), leading to an enhanced crystallinity among the P3HT molecules, even in a P3HT:PC61BM blend. The enhanced crystallinity improved the charge transport and current density (8.3–11.1mA/cm2) and increased the power conversion efficiency (3.1–3.9%) in an organic solar cell.
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