Simple Triphenylamine-Based Hole-Transporting Materials for Perovskite Solar Cells

• Published in: Electrochimica acta Vol. 182; pp. 733 - 741
• Main Authors: Lv, Songtao, Song, Yakun, Xiao, Junyan, Zhu, Lifeng, Shi, Jiangjian, Wei, Huiyun, Xu, Yuzhuan, Dong, Juan, Xu, Xin, Wang, Shirong, Xiao, Yin, Luo, Yanhong, Li, Dongmei, Li, Xianggao, Meng, Qingbo
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 10.11.2015
• Subjects: Dopant-free; Easy synthesis; Hole-transporting materials; Perovskite solar cells; Triphenylamine derivatives; Easy synthesis; Triphenylamine derivatives; Dopant-free; Hole-transporting materials; Perovskite solar cells
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2015.09.165

[Display omitted] We report two simple triphenylamine-based hole-transporting materials (HTMs) containing vinyl derivatives, 3,6-di(2-(4-(N,N-di(p-tolyl)amino)phenyl)vinyl)-2-thiophene (apv-T) and 3,6-di(2-(4-(N,N-di(p-tolyl)amino)phenyl)vinyl)-9-ethyl-carbazole (apv-EC) for the perovskite solar cells. According to theoretical calculation and experimental results, their HOMO energy levels are similar to that of conventional spiro-OMeTAD, which is supposed to be favorable for the hole transportation in the device. Up to 12% of light-to-electricity conversion efficiency has been achieved for the mesoporous TiO2/CH3NH3PbI3/apv-EC/Au solar cell without using p-type dopants. Time-resolved photoluminescence (PL) measurement and Electrochemical Impedance Spectra (EIS) further reveal that relatively high hole mobility of the apv-EC and weak recombination occurred at TiO2/CH3NH3PbI3/apv-EC interfaces of the device are crucial to the good performance in comparison with the apv-T. Advantages such as easy synthesis, low cost and relatively good cell performance provide a potential application as the replacement of the expensive spiro-OMeTAD.