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Type: Journal article
Title: Raman spectroscopy of formamidinium-based lead halide perovskite single crystals
Author: Ruan, S.
McMeekin, D.P.
Fan, R.
Webster, N.A.S.
Ebendorff-Heidepriem, H.
Cheng, Y.B.
Lu, J.
Ruan, Y.
McNeill, C.R.
Citation: The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter, 2020; 124(4):2265-2272
Publisher: American Chemical Society
Issue Date: 2020
ISSN: 1932-7447
Statement of
Shuai Ruan, David P. McMeekin, Rong Fan, Nathan A. S. Webster, Heike Ebendorff-Heidepriem, Yi-Bing Cheng, Jianfeng Lu, Yinlan Ruan, Christopher R. McNeil
Abstract: Raman spectroscopy is a powerful technique for the study of materials chemistry and nanostructure. This nondestructive technique is highly sensitive to molecular and crystal lattice vibrations, which allow for a comprehensive study of the vibrational modes of molecules incorporated in photovoltaic perovskite materials. In this study, we apply Raman spectroscopy to study FAPbX3 (X = Cl, Br, I) and FAxMA1–xPbI3 (FA stands for formamidinium; MA for methylammonium) metal halide perovskite single crystals and discuss the necessary conditions to obtain reliable data. We establish a correlation between perovskite composition and their unique Raman intensities/spectral shapes. In particular, we show that tuning of the halide content results in a spectral shift of the organic features of the Raman spectrum due to changes in the strength of hydrogen bonding, while tuning of the organic cation is related more to changes in peak intensity. Moreover, the effect of temperature on the vibrational modes corresponding to NCN bending, NH2 torsion, and NH2 wagging were studied. This enables the impact of the organic composition in FAxMA1–xPbI3 on the phase transition temperature of the material to be determined. Furthermore, we establish links between Raman spectroscopy and other conventional measurement techniques such as X-ray diffraction (XRD) and differential scanning calorimetry (DSC). This study provides insight into the interpretation of the Raman spectra of FA-based perovskites, which furthers understanding of the properties of these materials in relation to their full exploitation in solar cells.
Rights: © 2020 American Chemical Society
DOI: 10.1021/acs.jpcc.9b08917
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