M.K. Chan, Y. Xia, P. Guo, R.D. Schaller, P. Darancet

Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois, UNITED STATES;

Perovskite halides display complex thermal transport properties due to the existence of lattice instabilities and phase transitions inherent to the perovskite structure, as well as disparate phonon frequencies in the case of hybrid organic-inorganic perovskite halides. In this talk, we will discuss our work on using first principles modeling to predict phonon renormalization, phonon-phonon interaction, and electron-phonon equilibration in perovskite halides, in conjunction with ultrafast spectroscopy measurements.

1. P. Guo, Y. Xia, J. Gong, C. C. Stoumpos, K. M. McCall, G. C. B. Alexander, H. Zhou, J. B. Ketterson, M. G. Kanatzidis, T. Xu, M. K. Y. Chan, R. D. Schaller, “Polar Domains in Metal-Halide Perovskites Uncovered by Acoustic Phonon Anomalies,” American Chemical Society Energy Letters, 2017. DOI:10.1021/acsenergylett.7b00790.
2. A. Y. Chang, Y.-J. Cho, K.-C. Chen, C.-W. Chen, A. Kinaci, M. K. Y. Chan, H.-W. Lin, R. D. Schaller, “Evidence of Slow Organic-to-Inorganic Sub-Lattice Thermalization in Methylammonium Lead Halide Perovskites,” Advanced Energy Materials, 6, 1600422 (2016). DOI:10.1002/aenm.201600422.