Ontology highlight
ABSTRACT:
SUBMITTER: Frost JM
PROVIDER: S-EPMC5727468 | biostudies-literature | 2017 Dec
REPOSITORIES: biostudies-literature
Frost Jarvist Moore JM Whalley Lucy D LD Walsh Aron A
ACS energy letters 20171023 12
Halide perovskites show unusual thermalization kinetics for above-bandgap photoexcitation. We explain this as a consequence of excess energy being deposited into discrete large polaron states. The crossover between low-fluence and high-fluence "phonon bottleneck" cooling is due to a Mott transition where the polarons overlap (<i>n</i> ≥ 10<sup>18</sup> cm<sup>-3</sup>) and the phonon subpopulations are shared. We calculate the initial rate of cooling (thermalization) from the scattering time in ...[more]