Giant deformation potential induced small polaron effect in Dion-Jacobson two-dimensional lead halide perovskites.

ABSTRACT: Halide perovskites have attracted substantial attention recently. However, the strong lattice distortion effects in these materials have led to debates regarding the nature of charge carriers. While the behavior of carriers in bulk three-dimensional materials is well-documented, the characteristics of carriers in two-dimensional perovskites remain less well understood. In this study, we provide direct and clear evidence of small polaron formation through transient spectroscopic analysis of deformation potential and dynamic lattice screening. Coherent acoustic phonon wave signals reveal a strong coupling between carriers and lattice degrees of freedom, leading to small polaron formation and a spin lifetime enhancement of up to 10-fold. Utilizing optical Kerr spectroscopy and theoretical mod

SUBMITTER: Huang Y 

PROVIDER: S-EPMC11970252 | biostudies-literature | 2025 May

REPOSITORIES: biostudies-literature