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Surface Management for Carbon‐Based CsPbI 2 Br Perovskite Solar Cell with 14% Power Conversion Efficiency
Author(s) -
Yu Fengyang,
Han Qianji,
Wang Liang,
Yang Shuzhang,
Cai Xiaoyong,
Zhang Chu,
Ma Tingli
Publication year - 2021
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202100404
Subject(s) - passivation , energy conversion efficiency , materials science , perovskite (structure) , carbon fibers , perovskite solar cell , electrode , optoelectronics , layer (electronics) , thermal stability , chemical engineering , solar cell , nanotechnology , chemistry , composite material , composite number , engineering
Carbon‐based hole transport material (HTM)‐free CsPbI 2 Br perovskite solar cells (C‐PSCs) have garnered considerable attention due to their super thermal stability. The energy‐level mismatch between the CsPbI 2 Br perovskite and carbon electrodes, however, results in major energy loss and reduced power conversion efficiency (PCE) of C‐PSCs. Herein, 1‐butyl‐3‐methylimidazolium tetrafluoroborate (BMIMBF 4 ) is used to manage the energy level, reduce defect densities, and improve the interface quality between CsPbI 2 Br and carbon electrodes. Preliminary results demonstrate that the BMIMBF 4 modifier can passivate the surface defects of the perovskite film and reduce the energy‐level mismatch between the CsPbI 2 Br layer and the carbon electrode. A PCE of 14.03% is achieved by introducing BMIMBF 4 which is improved by 23% compared with the control device (11.37%). Moreover, stability—whether in the case of C‐PSCs or CsPbI 2 Br films—is also improved.