Advances in hot carrier relaxation dynamics of perovskites with ultrafast time-resolved detection

Perovskite (PVK) materials have been widely studied and widely used in photoelectric conversion devices due to their unique crystal structure, many interesting physical and chemical properties and low manufacturing cost. Despite extensive research, challenges remain in fully understanding the dynamic processes of carrier recombination, separation, transport and dynamic evolution of defect states, which are critical to device performance. Addressing these gaps is essential for the development of high-speed optoelectronic devices. The development of high-speed devices requires a full understanding of the properties of materials, especially the dynamic processes such as carrier recombination, separation, and transport, which often play a vital role in the performance of devices. Therefore, in order to better understand and control the behavior of photo-induced hot carriers (HC), ultrafast laser detection technology is applied to the study of PVK materials, which can observe and measure the generation, transmission, and recombination of photo-induced HCs in real time to reveal their dynamic behavior and photoelectric properties. This paper summarizes the latest research progress of ultrafast carrier dynamics in all-inorganic halide PVKs, double PVKs and organic-inorganic halide PVKs to fully understand their carrier relaxation, recombination, transfer, and other behaviors. Additionally, this review highlights emerging trends and unresolved issues in HC dynamics, aiming to provide a roadmap for future studies in this area. It is expected that with the help of the relevant physical mechanism of HC relaxation dynamics obtained here, breakthroughs will be made in improving and regulating the photoelectric conversion efficiency and the corresponding ultrafast light response devices in the future.