Disentangling Refractive Index Contributions in Transient Absorption Spectroscopy of Two-Dimensional Halide Perovskites.

ABSTRACT: Two-dimensional (2D) halide perovskites are intensely researched for emerging light-emitting and -harvesting technologies due to their outstanding optoelectronic properties, strong quantum confinement, and enhanced ambient stability over their three-dimensional counterparts. A powerful technique for understanding their excited-state dynamics is transient absorption (TA) (pump-probe) spectroscopy. However, the interpretation can be complicated by simultaneous reflectivity changes arising from their high refractive index. Here, we adopt a Kramers-Kronig constrained variational analysis to disentangle these effects, as demonstrated for the prototypical Ruddlesden-Popper 2D perovskite phenylethylammonium lead iodide (PEA₂PbI₄). We show that photoinduced changes in the rea

SUBMITTER: Chua XW 

PROVIDER: S-EPMC12581162 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature