Abstract
In this work, we report on the enhanced power conversion efficiency (PCE) of inverted polymer solar cells (I-PSCs) that use a surface treatment of ZnO electron transporting layer by benzoic acid derivatives. A thin SAM layers of 4-methoxybenzoic acid (mBA) or 4'-methoxybiphenyl-4-carboxylic acid (mBPCA), prepared by spin-coating, on top of ZnO, was used to induce a surface dipole at the ZnO resulted in decrease of series resistance and finally simultaneous enhancements of the short-circuit current density and fill factor. The PCE of I-PSCs based on mBA and mBPCA treated ZnO reaches 6.74 and 7.11%, respectively, while the PCE of the device based on untreated ZnO is 6.52% for PTB7:PC71BM based bulk-heterojunction active layer systems. Our results provide a promising approach to improve the performance of highly efficient inverted polymer solar cells.
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