Synergistic Effects of Bipolar Additives on Grain Boundary-Mediated Charge Transport for Efficient Carbon-Based Inorganic Perovskite Solar Cells
Author(s): Mei, YT (Mei, Yantao); Lu, XY (Lu, Xiayao); Dong, C (Dong, Chen); Tan, FR (Tan, Furui); Cui, MH (Cui, Minghuan); Haruta, YK (Haruta, Yuki); Yeddu, V (Yeddu, Vishal); Wang, MY (Wang, Mengyue); Liu, K (Liu, Kong); Yue, GT (Yue, Gentian); Gao, YY (Gao, Yueyue); Qu, SC (Qu, Shengchun); Qin, CC (Qin, Chaochao); Zhang, WF (Zhang, Weifeng); Ding, LM (Ding, Liming); Saidaminov, MI (Saidaminov, Makhsud, I); Wang, ZJ (Wang, Zhijie)
Source: ACS APPLIED MATERIALS & INTERFACES DOI: 10.1021/acsami.2c11895 Early Access Date: AUG 2022
Abstract: Carbon-based all-inorganic CsPbIxBr3-x perovskite solar cells offer high stability against heat and humidity and a suitable band gap for tandem and semitransparent photovoltaics. In CsPbIxBr3-x perovskite films, the defects at grain boundaries (GBs) cause charge trapping, reducing the efficiency of the cell. Electronic deactivation of GB has been a conventional strategy to suppress the trapping, but at the cost of charge carrier transport through the boundaries. Here, we turn the GBs into benign charge transport pathways with the aid of bipolar charge transport semiconductors, namely, Ti3C2TX (MXene) and Spiro-OMeTAD, respectively. Thanks to the synergistic effects of both n-and p-type transport media, the charge transport is improved and balanced at the GBs. As a result, the cells achieve an efficiency of 12.7%, the highest among all low-temperature-processed carbon-based inorganic perovskite solar cells. Benign GBs also lead to enhanced light and aging stabilities. Our work demonstrates a proof-of-concept strategy of benign electronic modulation of GBs for solution-processed perovskite solar cells.
Accession Number: WOS:000849772600001
PubMed ID: 35979625
ISSN: 1944-8244
eISSN: 1944-8252
