Thermalization and relaxation mediated by phonon management in tin-lead perovskites.

ABSTRACT: Understanding and control of ultrafast non-equilibrium processes in semiconductors is key to making use of the full photon energy before relaxation, leading to new ways to break efficiency limits for solar energy conversion. In this work, we demonstrate the observation and modulation of slow relaxation in uniformly mixed tin-lead perovskites (MASn_xPb_1-xI₃ and CsSn_xPb_1-xI₃ nanocrystals). Transient absorption measurements reveal that slow cooling mediated by a hot phonon bottleneck effect appears at carrier densities above ~10¹⁸ cm^-3 for tin-lead alloy nanocrystals, and tin addition is found to give rise to suppressed cooling. Within the alloy nanoparticles, the combination of a newly introduced high-ener

SUBMITTER: Dai L 

PROVIDER: S-EPMC10468496 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature