Yuanhe Fu, Hyojung Cha, Seulki Song, Gang-Young Lee, Chan Eon Park and Taiho Park Low-bandgap quinoxaline-based D–A-type copolymers: Synthesis, characterization, and photovoltaic properties Journal of Polymer Science Part A: Polymer Chemistry 51
A series of low-bandgap polymers, P(T-Qx), P(BDT-Qx), and P(BDT-DTQx), based on electron-deficient Qx unit has been synthesized. Among them, P(T-Qx) having a stronger electron donor showed the most rigid planar structure, providing a high hole mobility and high performance in the solar cell. On the contrary, the P(BDT-Qx)-based solar cell had lower power conversion efficiency with the largest torsional angle between BDT and Qx units. The BDT unit in the P(BDT-DTQx) backbone acted as a linker, which interfered in the formation of the charge complexation and the quinoidal electronic conformation in one polymer chain.
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