Synthesizing PM6-based Terpolymers for Organic Photovoltaic Cells: Modulation of Optical, Electrochemical and Morphological Properties
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PM6 has been widely used as a polymer donor for organic photovoltaics. With a small molecule acceptor, Y6, the PM6:Y6 based OPV devices showed unprecedented performances over 15% of power conversion efficiency. Terpolymer is a well-known strategy for modulating optical, electrochemical and morphological properties of a mother copolymer. In this presentation, we designed a 3rd component of HDOBT as well as 2FBDT and synthesized two kinds of terpolymers by incorporating 20 mol% HDOBT and 2FBDT into a PM6 polymer as a third component. This new HDOBT20 polymer showed increased Voc. Due to a down shifted HOMO energy level of HDOBT20, a HDOBT20:Y6 blend exhibited a larger energy off-set between the HOMO of donor and LUMO of acceptor, compared to PM6:Y6. In contrast, 2FBDT20:Y6 showed a similar Voc value to that of PM6:Y6. The optical, morphological and photoelectrical characteristics of the synthesized terpolymers and their blends will be discussed in detail by comparing with those of PM6:Y6