Improved Performance of Printable Perovskite Solar Cells with Bifunctional Conjugated Organic Molecule

Yue Hu; Zhihui Zhang; Anyi Mei; Youyu Jiang; Xiaomeng Hou; Qifei Wang; Kai Du; Yaoguang Rong; Yinhua Zhou; Gengzhao Xu; Hongwei Han

doi:10.1002/adma.201705786

Improved Performance of Printable Perovskite Solar Cells with Bifunctional Conjugated Organic Molecule

Adv Mater. 2018 Mar;30(11). doi: 10.1002/adma.201705786. Epub 2018 Jan 29.

Authors

Yue Hu¹, Zhihui Zhang¹, Anyi Mei¹, Youyu Jiang¹, Xiaomeng Hou¹, Qifei Wang¹, Kai Du², Yaoguang Rong¹, Yinhua Zhou¹, Gengzhao Xu², Hongwei Han¹

Affiliations

¹ Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, P. R. China.
² Suzhou Institute of Nano-Tech and Nano-Bionics, CAS, Suzhou, 215123, P. R. China.

PMID: 29377428
DOI: 10.1002/adma.201705786

Abstract

A bifunctional conjugated organic molecule 4-(aminomethyl) benzoic acid hydroiodide (AB) is designed and employed as an organic cation in organic-inorganic halide perovskite materials. Compared with the monofunctional cation benzylamine hydroiodide (BA) and the nonconjugated bifunctional organic molecule 5-ammonium valeric acid, devices based on AB-MAPbI₃ show a good stability and a superior power conversion efficiency of 15.6% with a short-circuit current of 23.4 mA cm^-2 , an open-circuit voltage of 0.94 V, and a fill factor of 0.71. The bifunctional conjugated cation not only benefits the growth of perovskite crystals in the mesoporous network, but also facilitates the charge transport. This investigation helps explore new approaches to rational design of novel organic cations for perovskite materials.

Keywords: bifunctional; conjugated molecules; perovskites; printable; solar cells.