Quantification of light-enhanced ionic transport in lead iodide perovskite thin films and its solar cell applications

Light, Science & Applications
Yicheng ZhaoQing Zhao

Abstract

Ionic transport in organometal halide perovskites is of vital importance because it dominates anomalous phenomena in perovskite solar cells, from hysteresis to switchable photovoltaic effects. However, excited state ionic transport under illumination has remained elusive, although it is essential for understanding the unusual light-induced effects (light-induced self-poling, photo-induced halide segregation and slow photoconductivity response) in organometal halide perovskites for optoelectronic applications. Here, we quantitatively demonstrate light-enhanced ionic transport in CH3NH3PbI3 over a wide temperature range of 17-295 K, which reveals a reduction in ionic transport activation energy by approximately a factor of five (from 0.82 to 0.15 eV) under illumination. The pure ionic conductance is obtained by separating it from the electronic contribution in cryogenic galvanostatic and voltage-current measurements. On the basis of these findings, we design a novel light-assisted method of catalyzing ionic interdiffusion between CH3NH3I and PbI2 stacking layers in sequential deposition perovskite synthesis. X-ray diffraction patterns indicate a significant reduction of PbI2 residue in the optimized CH3NH3PbI3 thin film produced ...Continue Reading

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Citations

Jan 10, 2019·Chemical Communications : Chem Comm·Roger A De Souza, Denis Barboni
Jun 13, 2019·Chemical Society Reviews·Bo ChenJinsong Huang
May 17, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Xuejiao ChenDezhen Shen
Mar 21, 2020·Light, Science & Applications·Kai-Kai LiuChong-Xin Shan
Sep 11, 2020·Chemical Society Reviews·Nengxu LiHuanping Zhou
May 31, 2017·Angewandte Chemie·Alessandro SenocrateJoachim Maier
Dec 25, 2019·Light, Science & Applications·Sung Bum KangKyoung Jin Choi
Dec 17, 2020·Physical Chemistry Chemical Physics : PCCP·Yao ZhaoQing Zhao
Jan 20, 2021·Physical Chemistry Chemical Physics : PCCP·Alessandra Geddo LehmannGiovanni Bongiovanni
Dec 12, 2020·Nature Communications·Yicheng ZhaoChristoph J Brabec
Jan 30, 2021·Nature Communications·Shun-Chang LiuJin-Song Hu
Dec 12, 2020·Light, Science & Applications·Sung Bum KangKyoung Jin Choi
Mar 18, 2021·Light, Science & Applications·Kai-Kai LiuChong-Xin Shan
May 11, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Ping LinCan Cui
Sep 5, 2018·ACS Applied Materials & Interfaces·Yao ZhaoQing Zhao

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