The photovoltaic performance of conjugated polymer electrolytes with diverse acid derivatives as a cathode buffer layer
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초록
내용
We fabricated inverted polymer solar cells (PSCs) that use a blend of PTB7-Th and PC71BM as the active layer and poly[(9,9-bis(30-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dihexylfluorene)] (PFN) with different amounts and types of acid derivatives as the cathode buffer layer to systematically study the effect of amounts and types of acid additives such as acetic acid (AA), 4-trifluoromethyl benzoic acid (CF3BA), trifluoroacetic acid (CF3AA), and 4-toluene sulfonic acid (TsOH) on the device performances. The power conversion efficiency (PCE) of the device of AA, CF3BA, CF3AA, and TsOH was 9.9, 10.3, 10.3, and 10.6%, respectively, whereas the PCE of the device with pristine ZnO was 8.7%. Additionally, we discovered that TsOH is the most effective acid derivative and devices based on PFN with acid derivatives have lower trap-assisted recombination and interfacial bimolecular recombination.