Large grain growth for hole-conductor-free fully printable perovskite solar cells via polyoxometalate molecular
Yuzhuo Zhang1, Yanju Wang1, Zhixia Sun1
1Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University, Changchun, Jilin 130024, P. R. China. linxu@nenu.edu.cn lify525@nenu.edu.cn.
Abstract:
A large-grained perovskite film, with a crystal grain size of ca. 30-50 μm, was achieved by polyoxometalate-induced Ostwald ripening. Aiming at commercially-oriented fully printable hole-conductor-free perovskite solar cells, the power conversion efficiency of the device was significantly improved from 9.17% to 11.35% (average) via polyoxometalate molecular doping. This is because the large-grained perovskite film could effectively reduce bulk defects and charge recombination, thereby facilitating charge transport.
