The evolution of ultrafast carrier dynamics in situ perovskite solar cells*

Photoelectric performances of perovskite solar cells (PSC), such as photovoltage, short-circuit current density, fill factor and power-conversation-efficiency are determined by the charge carrier dynamics, especially the early-stage processes including charge generation, recombination and interface transfer. These photophysics dynamics, which are within pico- to nano-second timescale, directly relate to the PSC working mechanism. However, the study on the ultrafast photophysics dynamics in situ PSC is still in infancy although considerable works were performed on the performance improvement at steady-state condition.
Aim to elucidate ultrafast carrier dynamics in-situ PSC, in this talk, we present the carrier dynamics in-situ organic–inorganic halide perovskite solar cells utilizing ultrafast photocurrent spectroscopy with sub-40 picosecond time. We study the evolution of ultrafast carrier dynamics in situ perovskite solar cells, in term of the evolution of open-circuit voltage, short-circuit current, and fill factor, in addition to addressing the desirable fundamental questions including carrier lifetime, mobility, trap density, and carrier transport mechanisms.