TY - JOUR
T1 - Stability of the Halide Double Perovskite Cs2AgInBr6
AU - Liu, Yukun
AU - Cleveland, Iver J.
AU - Tran, Minh N.
AU - Aydil, Eray S.
N1 - Funding Information:
The New York University (NYU) Shared Instrumentation was constructed through the support of the National Center for Research Resources, National Institutes of Health under Research Facilities Improvement, Award Number C06 RR-16572-01. NYU’s X-ray diffraction facility is supported by the Materials Research Science and Engineering Center (MRSEC) program of the National Science Foundation under Award Numbers DMR-0820341 and DMR-1420073 by the National Science Foundation. The MERLIN (Carl Zeiss) field emission scanning electron microscope (FESEM) instrument was purchased with financial support from the MRI program of the National Science Foundation under Award DMR-0923251. E.S.A. gratefully acknowledges support from the Alstadt Lord Mark Chair.
Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society.
PY - 2023/3/30
Y1 - 2023/3/30
N2 - Cs2AgInBr6 is among the lead-free halide perovskites of interest, predicted by first-principles calculations to be stable with a direct band gap, but there has been only one report of its synthesis. Herein we report the formation of Cs2AgInBr6 thin films through thermal evaporation of CsBr, AgBr, and InBr3 and subsequent annealing between 130 °C and 250 °C. Cs2AgInBr6 appears stable in this temperature range. However, Cs2AgInBr6 thin films are thermodynamically unstable at room temperature, remaining cubic only long enough to be characterized but not long enough to be useful for practical devices. Cs2AgInBr6 decomposed into Cs2AgBr3, Cs3In2Br9, AgBr, and InBr3 upon cooling from 130 °C to 250 °C to room temperature. This conclusion did not depend on illumination, film thickness, annealing environment, or details of the film formation, pointing to an intrinsic thermodynamic instability of the material. Optical absorption measurements may be interpreted as Cs2AgInBr6 having a direct band gap of 1.57 ± 0.1 eV.
AB - Cs2AgInBr6 is among the lead-free halide perovskites of interest, predicted by first-principles calculations to be stable with a direct band gap, but there has been only one report of its synthesis. Herein we report the formation of Cs2AgInBr6 thin films through thermal evaporation of CsBr, AgBr, and InBr3 and subsequent annealing between 130 °C and 250 °C. Cs2AgInBr6 appears stable in this temperature range. However, Cs2AgInBr6 thin films are thermodynamically unstable at room temperature, remaining cubic only long enough to be characterized but not long enough to be useful for practical devices. Cs2AgInBr6 decomposed into Cs2AgBr3, Cs3In2Br9, AgBr, and InBr3 upon cooling from 130 °C to 250 °C to room temperature. This conclusion did not depend on illumination, film thickness, annealing environment, or details of the film formation, pointing to an intrinsic thermodynamic instability of the material. Optical absorption measurements may be interpreted as Cs2AgInBr6 having a direct band gap of 1.57 ± 0.1 eV.
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U2 - 10.1021/acs.jpclett.3c00303
DO - 10.1021/acs.jpclett.3c00303
M3 - Article
C2 - 36943190
AN - SCOPUS:85151313211
SN - 1948-7185
VL - 14
SP - 3000
EP - 3006
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 12
ER -