Thermal Stability of Mixed Cation Metal Halide Perovskites in Air

Wanliang Tan; Andrea R Bowring; Andrew C Meng; Michael D McGehee; Paul C McIntyre

doi:10.1021/acsami.7b15263

Thermal Stability of Mixed Cation Metal Halide Perovskites in Air

ACS Appl Mater Interfaces. 2018 Feb 14;10(6):5485-5491. doi: 10.1021/acsami.7b15263. Epub 2018 Jan 30.

Authors

Wanliang Tan¹, Andrea R Bowring¹, Andrew C Meng¹, Michael D McGehee¹, Paul C McIntyre¹

Affiliation

¹ Department of Materials Science and Engineering, Stanford University , Stanford, California 94305, United States.

PMID: 29328620
DOI: 10.1021/acsami.7b15263

Abstract

We study the thermal stability in air of the mixed cation organic-inorganic lead halide perovskites Cs_0.17FA_0.83Pb(I_0.83Br_0.17)₃ and Cs_0.05(MA_0.17FA_0.83)_0.95Pb(I_0.83Br_0.17)₃. For the latter compound, containing both MA⁺ and FA⁺ ions, thermal decomposition of the perovskite phase was observed to occur in two stages. The first stage of decomposition occurs at a faster rate compared to the second stage and is only observed at relatively low temperatures (T < 150 °C). For the second stage, we find that both decomposition rate and the activation energy have similar values for Cs_0.05(MA_0.17FA_0.83)_0.95Pb(I_0.83Br_0.17)₃ and Cs_0.17FA_0.83Pb(I_0.83Br_0.17)₃, which suggests that the first stage mainly involves reaction of MA⁺ and the second stage mainly FA⁺.

Keywords: XRD; in situ; mixed cation; perovskite; thermal stability.