posted on 2023-11-24, 00:21authored byZiyong Kang, Yu Tong, Kun Wang, Yali Chen, Peng Yan, Guangjiu Pan, Peter Müller-Buschbaum, Lu Zhang, Yang Yang, Jiandong Wu, Haijiao Xie, Shengzhong Liu, Hongqiang Wang
2D–3D
tin perovskites are considered as promising candidates
for realizing efficient lead-free perovskite solar cells (PSCs). However,
the ultrathin 2D phases could unfavorably affect charge transport
and device performance. In the present work, we demonstrate that
the introduction of D-homoserine lactone hydrochloride (D-HLH) can
tailor the low-dimensional phases and improve the quality of 2D–3D
tin perovskite films. The functional group in D-HLH can interact with
FA+ and I– as well as Sn2+ in the precursor solution. These interactions not only affect the
formation of tin perovskite film and favor the formation of thicker
2D phases but also decrease the defect density and suppress the nonradiative
recombination. As a result, the efficiency of tin PSCs is significantly
improved from 7.97 to 12.45%, and the stability of the device is also
enhanced. This work provides a feasible strategy to regulate the low-dimensional
phases in 2D–3D tin PSCs toward realizing high efficiency.