Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session J59: Electronic Structure: Thermodynamic and Optical Properties
3:00 PM–5:48 PM,
Tuesday, March 16, 2021
Sponsoring Unit: FIAP
Chair: Thuc Mai, National Institute of Standards and Technology
Abstract: J59.00001 : Optical Properties of Cs2AgBiBr6*
3:00 PM–3:12 PM
Cs2AgBiBr6 is a halide double perovskite and has been proposed as a more stable and less toxic alternative to the high photovoltaic efficiency lead based perovskites. We have synthesized 4mm single crystals of Cs2AgBiBr6 by a controlled cooling method. The crystals were characterized with X-ray Diffraction and the phase transition from the room temperature cubic structure (Fm-3m) to the low temperature tetragonal structure (I4/m) was detected at near 120K through differential scanning calorimetry. Investigated optical properties near the band gap of Cs2AgBiBr6 via transmission measurements, temperature dependent resonant Raman scattering, and photoluminescence will be presented. Of note, the Stokes Raman spectrum exhibited resonant enhancement with 532.8 nm laser excitation. The A1g/Ag phonon at 5.36 THz exhibits anomalies in the temperature dependence of its Lorentzian fit parameters at the structural phase transition and a characteristic temperature of 40 K whose origin remains to be investigated further.
 A. H. Slavney et.al. Journal of the American Chemical Society 2016. 138 (7), 2138-2141
 Y. Lixiao et. al. Advanced Optical Materials 2019. 7 (19), 1900491.
*Financial support from NSERC Canada grant DDG-0043 and Brock University is gratefully acknowledged.
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