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Advanced Raman Spectroscopy of Cs2AgBiBr6 Double Perovskites and Identification of Cs3Bi2Br9 Secondary Phases

Authors: P. Pistor, M. Meyns, M. Guc, H.-C. Wang, M.A.L. Marques, X. Alcobé, A. Cabot, and V. Izquierdo-Roca

Ref.: Scr. Mater. 184, 24-29 (2020)

Abstract: Cs2AgBiBr6 double perovskites are intensely investigated as lead-free, stable alternatives to organic lead halide perovskites. In this contribution, we revise the vibrational modes of Cs2AgBiBr6 and show that Raman spectroscopy is well suited for the detection of common secondary phases such as Cs3Bi2Br9. The combined Raman analysis at pre-, near- and non-resonant conditions allows us to extract the four vibrational modes of Cs2AgBiBr6 to unprecedented detail, the most intense one at 177.3 cm-1. The experimental results are in good agreement with theoretical density functional theory calculations. In addition, we monitor the decomposition of Cs2AgBiBr6 into Cs3Bi2Br9 at temperatures above 255°C.

Citations: 2 (Google scholar)

DOI: 10.1016/j.scriptamat.2020.03.040

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Bibtex:

@article{Pistor_2020,
	doi = {10.1016/j.scriptamat.2020.03.040},
	url = {https://doi.org/10.1016%2Fj.scriptamat.2020.03.040},
	year = 2020,
	month = {jul},
	publisher = {Elsevier {BV}},
	volume = {184},
	pages = {24--29},
	author = {Paul Pistor and Michaela Meyns and Maxim Guc and Hai-Chen Wang and Miguel A.L. Marques and Xavier Alcob{\'{e}} and Andreu Cabot and Victor Izquierdo-Roca},
	title = {Advanced Raman spectroscopy of Cs2AgBiBr6 double perovskites and identification of Cs3Bi2Br9 secondary phases},
	journal = {Scripta Materialia}
}