Hot carrier extraction in CH₃NH₃PbI₃ unveiled by pump-push-probe spectroscopy.

ABSTRACT: Halide perovskites are promising materials for development in hot carrier (HC) solar cells, where the excess energy of above-bandgap photons is harvested before being wasted as heat to enhance device efficiency. Presently, HC separation and transfer processes at higher-energy states remain poorly understood. Here, we investigate the excited state dynamics in CH₃NH₃PbI₃ using pump-push-probe spectroscopy. It has its intrinsic advantages for studying these dynamics over conventional transient spectroscopy, albeit complementary to one another. By exploiting the broad excited-state absorption characteristics, our findings reveal the transfer of HCs from these higher-energy states into bathophenanthroline (bphen), an energy selective organic acceptor far above p

SUBMITTER: Lim SS 

PROVIDER: S-EPMC6858252 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature