Communicating Two States in Perovskite Revealed by Time-Resolved Photoluminescence Spectroscopy.

ABSTRACT: Organic-inorganic perovskite as a promising candidate for solar energy harvesting has attracted immense interest for its low-cost preparation and extremely high quantum efficiency. However, the fundamental understanding of the photophysics in perovskite remains elusive. In this work, we have revealed two distinct states in MAPbI₃ thin films at low temperature through time-resolved photoluminescence spectroscopy (TRPL). In particular, we observed a photo-induced carrier injection from the high energy (HE) state to the low energy (LE) state which has a longer lifetime. The strong interaction between the two states, evidenced by the injection kinetics, can be sensitively controlled through the excitation power. Understanding of the interacting two-states not only sheds light on the

SUBMITTER: Chen Y 

PROVIDER: S-EPMC6220243 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature