Study on carrier dynamics of perovskite solar cells via transient absorption

Perovskite solar cells (PSCs) are the most promising candidate for next-generation photovoltaics. The carrier dynamics behavior in perovskite is closely related to the performance of the solar cell. Particularly, manipulating the hot carriers has the potential to achieve ultrahigh-efficiency solar cells beyond the conventional Shockley-Queisser efficiency limit. Therefore, it is crucial to study and understand the carrier transport process in perovskite. However, the carrier dynamics behavior in the femtosecond time scale is difficult to be detected. Nowadays, femtosecond transient absorption techniques address this challenge effectively. We summarize the monitoring of hot carriers cooling, trapping of defect states, and charge transfer process after photoexcitation of PSCs by transient absorption and analyze the effective utilization of carriers in these processes. Finally, an outlook that will encounter in its future development is provided.