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Title: Strong self-trapping by deformation potential limits photovoltaic performance in bismuth double perovskite
Authors: Wu, Bo
Ning, Weihua
Xu, Qiang
Manjappa, Manukumara
Feng, Minjun
Ye, Senyun
Fu, Jianhui
Lie, Stener
Yin, Tingting
Wang, Feng
Goh, Teck Wee
Harikesh, Padinhare Cholakkal
Tay, Eugene Yong Kang
Shen, Zexiang
Huang, Fuqiang
Singh, Ranjan
Zhou, Guofu
Gao, Feng
Sum, Tze Chien
Keywords: Science::Physics
Issue Date: 2021
Source: Wu, B., Ning, W., Xu, Q., Manjappa, M., Feng, M., Ye, S., Fu, J., Lie, S., Yin, T., Wang, F., Goh, T. W., Harikesh, P. C., Tay, E. Y. K., Shen, Z., Huang, F., Singh, R., Zhou, G., Gao, F. & Sum, T. C. (2021). Strong self-trapping by deformation potential limits photovoltaic performance in bismuth double perovskite. Science Advances, 7(8), eabd3160-.
Project: M4080514
Journal: Science Advances 
Abstract: Bismuth-based double perovskite Cs2AgBiBr6 is regarded as a potential candidate for low-toxicity, high-stability perovskite solar cells. However, its performance is far from satisfactory. Albeit being an indirect bandgap semiconductor, we observe bright emission with large bimolecular recombination coefficient (reaching 4.5 ± 0.1 × 10−11 cm3 s−1) and low charge carrier mobility (around 0.05 cm2 s−1 V−1). Besides intermediate Fröhlich couplings present in both Pb-based perovskites and Cs2AgBiBr6, we uncover evidence of strong deformation potential by acoustic phonons in the latter through transient reflection, time-resolved terahertz measurements, and density functional theory calculations. The Fröhlich and deformation potentials synergistically lead to ultrafast self-trapping of free carriers forming polarons highly localized on a few units of the lattice within a few picoseconds, which also breaks down the electronic band picture, leading to efficient radiative recombination. The strong self-trapping in Cs2AgBiBr6 could impose intrinsic limitations for its application in photovoltaics.
ISSN: 2375-2548
DOI: 10.1126/sciadv.abd3160
DOI (Related Dataset): 10.21979/N9/LTPBM2
Rights: © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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