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Title: Effect of alloying on the dynamics of coherent acoustic phonons in bismuth double perovskite single crystals
Authors: Lin, Xihong
Wu, Bo
Ning, Weihua
Feng, Minjun
Xu, Qiang
Gao, Feng
Sum, Tze Chien
Zhou, Guofu
Keywords: Science::Physics
Issue Date: 2021
Source: Lin, X., Wu, B., Ning, W., Feng, M., Xu, Q., Gao, F., ... Zhou, G. (2021). Effect of alloying on the dynamics of coherent acoustic phonons in bismuth double perovskite single crystals. Optics Express, 29(5), 7948-7955. doi:10.1364/OE.414857
Project: National Natural Science Foundation of China (NFSC) (51802331)
Program for Chang Jiang Scholars and Innovative Research Teams in Universities (No. IRT_17R40)
Science and Technology Program of Guangzhou (2019050001)
Guangdong Provincial Key Laboratory of Optical Information Materials and Technology (2017B030301007) and the 111 Project
Ministry of Education (Singapore) under its AcRF Tier 2 grant MOE2019-T2-1-006
National Research Foundation (NRF) Singapore under its NRF Investigatorship (NRF-NRFI-2018-04)
Journal: Optics Express
Abstract: The bismuth double perovskite Cs2AgBiBr6 has been regarded as a potential candidate for lead-free perovskite photovoltaics. A detailed study on the coherent acoustic phonon dynamics in the pure, Sb- and Tl-alloyed Cs2AgBiBr6 single crystals is performed to understand the effects of alloying on the phonon dynamics and band edge characteristics. The coherent acoustic phonon frequencies are found independent on the alloying, while the damping rates are highly dependent on the alloying. Based on the mechanism of coherent acoustic phonon damping, a technique has been successfully developed that can accurately extract the absorption spectra near the indirect band gap for these single crystals with coefficients on the order of 10^2 cm^(-1).
ISSN: 1094-4087
DOI: 10.1364/OE.414857
Rights: © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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