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Flash Surface Treatment of CH 3 NH 3 PbI 3 Films Using 248 nm KrF Excimer Laser Enhances the Performance of Perovskite Solar Cells
Author(s) -
Shan Xueyan,
Wang Shimao,
Dong Weiwei,
Pan Ning,
Shao Jingzhen,
Wang Xiangqi,
Tao Ruhua,
Deng Zanhong,
Hu Linhua,
Kong Fantai,
Meng Gang,
Fang Xiaodong
Publication year - 2019
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.201900020
Subject(s) - materials science , perovskite (structure) , excimer laser , excimer , nanosecond , energy conversion efficiency , optoelectronics , laser , open circuit voltage , analytical chemistry (journal) , optics , voltage , chemistry , physics , chromatography , crystallography , quantum mechanics
For perovskite solar cells (PSCs), the surface traps of perovskite films have great influence on the charge carrier behavior at the interface of perovskite and charge transport layers. In this investigation, a 248 nm KrF excimer laser with high photon energy and shallow penetration depth is introduced to perform surface modification on the CH 3 NH 3 PbI 3 film through irradiation for reducing its surface trap density for the first time. A whole excimer laser surface modification (ELSM) process can be completed in few seconds, and the actual interaction time of the excimer laser and perovskite film is only several hundred nanoseconds. After ELSM, the trap density of the CH 3 NH 3 PbI 3 film decreases from 1.61 × 10 16 cm −3 to 5.81 × 10 15 cm −3 , and the nonradiative recombination is suppressed effectively. As a result, the open‐circuit voltage and the power conversion efficiency (PCE) of CH 3 NH 3 PbI 3 ‐based PSCs increase from 1082 ± 27 to 1117 ± 16 mV and from 16.69% ± 0.77% to 18.50% ± 0.65%, respectively, and the PCE of the champion device reaches 19.38%. In addition, the measured larger charge recombination resistance, slower open‐circuit photovoltage decay, and longer charge recombination lifetime confirm the effective suppression effect of ELSM on the charge carrier recombination in PSCs.