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Title: Structural Disorder and Spin Dynamics Study in Millimeter-Sized All-Inorganic Lead-Free Cesium Bismuth Halide Perovskite Single Crystals
Authors: Tailor N.K.
Satapathi, Soumitra
Published in: ACS Applied Energy Materials
Abstract: Perovskite single crystals have emerged as potential candidates in the field of optoelectronic devices because of their low trap state densities, long diffusion lengths, and high charge carrier mobilities. However, the presence of lead (Pb) in perovskite causes serious concerns due to lead's high-perceived toxicity and poor environmental stability. Therefore, development of lead-free perovskites as a potential alternative material and an environment-friendly candidate has received critical attention. Here, we report the synthesis of all-inorganic millimeter-sized lead-free bismuth-based halide perovskite Cs3Bi2X9 (X = Cl, Br, I) single crystals and their structural disorderness, optical, and spin relaxation properties in detail. Higher Urbach energy in Cs3Bi2X9 single crystals reveals a high degree of local structural disorderness and a short range of crystallinity. We show that structural disorder affects not only the optical properties but also the magnetic and spin relaxation properties. We observe that increased structural disorder leads to enhanced smearing of local energy bands and high spin-orbit coupling. The spin relaxation time is determined in the picoseconds time scale, which corresponds to fast charge carrier dynamics. Our work provides a design strategy and in-depth understanding to develop environment-friendly lead-free and stable perovskite-based optoelectronics and spintronic devices. ©
Citation: ACS Applied Energy Materials, 3(12): 11732-11740
Issue Date: 2020
Publisher: American Chemical Society
Keywords: electron spin resonance
space group
structural disorder
Urbach energy
ISSN: 25740962
Author Scopus IDs: 57211634045
Author Affiliations: Tailor, N.K., Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Haridwar Uttarakhand, 247667, India
Satapathi, S., Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Haridwar Uttarakhand, 247667, India
Funding Details: N.K.T. acknowledges UGC Research Fellowship. S.S. thanks Ministry of Science and Information Technology Research Grant DIC-1377-PHY. University Grants Committee, UGC; Ministry of Science Research and Technology, MSRT: DIC-1377-PHY
Corresponding Author: Satapathi, S.; Department of Physics, India; email:
Appears in Collections:Journal Publications [PH]

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