Operando dynamics of trapped carriers in perovskite solar cells observed via infrared optical activation spectroscopy.

ABSTRACT: Conventional spectroscopies are not sufficiently selective to comprehensively understand the behaviour of trapped carriers in perovskite solar cells, particularly under their working conditions. Here we use infrared optical activation spectroscopy (i.e., pump-push-photocurrent), to observe the properties and real-time dynamics of trapped carriers within operando perovskite solar cells. We compare behaviour differences of trapped holes in pristine and surface-passivated FA_0.99Cs_0.01PbI₃ devices using a combination of quasi-steady-state and nanosecond time-resolved pump-push-photocurrent, as well as kinetic and drift-diffusion models. We find a two-step trap-filling process: the rapid filling (~10 ns) of low-density traps in the bulk of perovskite, followed b

SUBMITTER: Pan J 

PROVIDER: S-EPMC10694143 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature