Journal of Industrial and Engineering Chemistry, Vol.46, 304-314, February, 2017
Effect of conjugated 2D-side groups on quinacridone-based copolymers to adjust deep HOMO level for photovoltaics
Different conjugated 2D-side groups were introduced to polymerize four types of two-dimensional polymers, PQCT-m8Qx, PQCT-mEHQx, PQCT-BT and PQCT-DPP, through a Suzuki coupling reaction. In comparison with the linear polymer which used the same backbone, the two-dimensional (2D) conjugated side chain polymer exhibits the delocalization of its electron clouds due to the extension of the side chain. So, all four polymers showed a low HOMO level, thus showing high VOC. Among the four, the HOMO level of PQCT-BT was the lowest, by -5.63 eV. When manufacturing a device, VOC was 0.92 V, which is the highest.