Abstract
Abstract In this work, three middle band-gap (Eg≈1.70 eV) polymer donors featuring thiazole moiety as π bridge while different alkyl side chain modification were synthesized for all-polymer solar cell (APSC) application. The influence of the configuration of alkyl side chain (linear, branched and alkylthio) on polymer-polymer miscibility and resulting photovoltaic performance was systemically investigated. The results indicated that the miscibility of polymer-polymer pair was sensitive to the solubility of resultant polymers, which was caused by diverse alkyl side chain modification. Since then, the most soluble one (P1, modified by 2-ethylhexyl side chain) could produce efficient as-cast APSC device with best PCE of 6.42%, accompanying with high Voc of 0.88 V and Jsc of 14.22 mA cm−2. This work revealed that while the incorporation of thiazole π bridge into quinoid-based polymer proves to be an efficient molecule design strategy, suitable alkyl side chain modification is also important to enhance polymer-polymer miscibility.
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