Abstract
Two perylenediimides (PDIs), PT and PT2, functionalized with thiophene heterocycles on the 1,7‐positions of the bay region were synthesized and utilized in inverted bulk‐heterojunction (BHJ) polymer solar cells as acceptors in the photoactive layer. The synthesized PDIs were thermally stable up to 453°C and soluble in chlorinated solvents such as dichloromethane and chloroform. PT or PT2 was blended with poly[4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b′]bithiophene‐co‐3‐fluorothieno[3,4‐b]thiophene‐2‐carboxylate] (PCE‐10) as a donor material. The inverted BHJ solar cell fabricated using the PCE‐10:PT photoactive layer showed the highest power conversion efficiency (PCE) of 2.06%. Film morphology studies of PCE‐10:PDI blends revealed a relationship between the film nanostructure and device performance.
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