Temperature-dependent trapping and polaron annihilation on ultrafast time scales in metal-halide perovskites.

ABSTRACT: Understanding carrier dynamics in photoexcited metal-halide perovskites is key for optoelectronic devices such as solar cells (low carrier densities) and lasers (high carrier densities). Trapping processes at low carrier densities and many-body recombination at high densities can significantly alter the dynamics of photoexcited carriers. Combining optical-pump/THz probe and transient absorption spectroscopy we examine carrier responses over a wide density range (10¹⁴-10¹⁹ cm^-3) and temperatures (78-315 K) in the prototypical methylammonium lead iodide perovskite. At densities below ∼10¹⁵ cm^-3 (room temperature, sunlight conditions), fast carrier trapping at shallow trap states occurs within a few picoseconds. As excited carrier densiti

SUBMITTER: Wang J 

PROVIDER: S-EPMC12478862 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature