Slow thermal equilibration in methylammonium lead iodide revealed by transient mid-infrared spectroscopy.

ABSTRACT: Hybrid organic-inorganic perovskites are emerging semiconductors for cheap and efficient photovoltaics and light-emitting devices. Different from conventional inorganic semiconductors, hybrid perovskites consist of coexisting organic and inorganic sub-lattices, which present disparate atomic masses and bond strengths. The nanoscopic interpenetration of these disparate components, which lack strong electronic and vibrational coupling, presents fundamental challenges to the understanding of charge and heat dissipation. Here we study phonon population and equilibration processes in methylammonium lead iodide (MAPbI₃) by transiently probing the vibrational modes of the organic sub-lattice following above-bandgap optical excitation. We observe inter-sub-lattice thermal equilibration

SUBMITTER: Guo P 

PROVIDER: S-EPMC6052157 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature