Influence of dimethoxytriphenylamine groups on carbazole-based hole transporting materials for perovskite solar cells

Abstract

The synthesis and characterization of a series of hole transporting materials (HTMs) based on carbazole core and dimethoxytriphenylamine (TPA) groups are reported. By modifying the number of TPA components in the HTMs, the influence of the structure of HTMs molecules on the photovoltaic performance of CH3NH3PbI3 perovskite solar cells are investigated. TPA2C, in which two TPA units are incorporated onto the carbazole core, exhibited higher photovoltaic performance than TPA1C, TPA3C and TPA4C, which contain one, three and four TPAs, respectively. The introduction of TPA group from one to two can improve the device result, however, additional branches introduced to the carbazole core did not led to higher efficiency.