Answers are grounded in this paper and cite their sources.
A comprehensive understanding of the carrier dynamics in low-dimensional quantum-confined lead halide perovskites (LHPs) nanocrystals (NCs) is essential to improve the performance. A systematic study of how the A-site cation manifests the ultrafast carrier relaxation dynamics is still lacking. Here, we have elucidated the A-site cation-dependent ultrafast carrier dynamics of APbBr3 (A = cesium, Cs/methylammonium, MA/formamidinium, FA) nanoplatelets (NPLs) using transient absorption spectroscopic measurements. The organic A-based (FA/MA) NPLs exhibit a noticeably shorter radiative lifetime compared with inorganic A-based (Cs) counterparts. Furthermore, FAPbBr3 NPLs exhibit faster ultrafast carrier relaxation dynamics, whereas CsPbBr3 NPLs display slower kinetics. It is evident from global analysis that CsPbBr3 NPLs exhibit longer trapping state lifetimes in comparison to FA cation-based NPLs, while MA cation-based NPLs exhibit the intermediate ones. Therefore, cation engineering in LHPs NPLs is a promising way to manifest the carrier relaxation dynamics that will help to design efficient light-harvesting systems.
No takes yet. Share an insight, caveat, or question.
Marjit et al. (2024) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: