Abstract
Two new binary polymers (P16, P20) and three random terpolymers (P17, P18, P19) with different ratios of the A1 (DPP) and A2 (BTTQ) acceptors in the polymer chains were developed and synthesized. Their optical and electrochemical properties were studied. The random terpolymers (P17, P18, P19) possess wider absorption spectra than the binary D–A copolymers (P16, P20). It was shown that the position of absorption bands and energy levels can be easily tuned by varying the molar ratios of the two different acceptor units in the terpolymer backbone. The synthesized random terpolymers can be used as efficient donor materials for fullerene and non-fullerene polymer solar cells.
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