Abstract
A new random terpolymer (PBDTT–DPP–TDTBT) based on alkylthienyl substituted benzodithiophene (BDTT), diketopyrrolopyrrole (DPP), and dialkylthienylbenzothiadiazole-thienyl vinylene (TDTBT) was designed and synthesized via the Stille coupling polymerization. The effects of DPP and TDTBT units on the thermal properties, photophysical and electrochemical properties of the polymer were investigated by thermogravimetric, UV–Vis–IR absorption spectra and cyclic voltammetry. By incorporating the TDTBT side-group into the random polymer main-chain, the absorption spectrum of PBDTT–DPP–TDTBT was broadened significantly. Moreover, the highest occupied molecular orbital (HOMO) energy level had been obviously lowered, consistent with the suitable backbone twists in main-chains. Therefore, the deep-lying HOMO energy level (ca. −5.5eV) was achieved, which was beneficial for high open-circuit voltage (Voc). Bulk heterojunction solar cells based on as-synthesized polymer as electron donor and (6,6)-phenyl-C61-butyric acid methyl ester (PC61BM) as acceptor were fabricated. The results demonstrate that the terpolymer PBDTT–DPP–TDTBT exhibits an improved power conversion efficiency of 4.85%.
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