Fig. 3: Spin-resolved transient absorption spectroscopy of (PEA)2(MA)Sn2I7 thin flake at room temperature.
From: Robust excitonic light emission in 2D tin halide perovskites by weak excited state polaronic effect
a Scheme of spin-resolved TA measurements where spin-polarized excitons are photoexcited by circularly polarized pump pulse and probed by same (SCP) or opposite (OCP) circular polarization. b 2D color plot of TA spectra under SCP and OCP conditions at 8 μJ cm−2 pump fluence. c Spectral evolution for SCP and OCP conditions at representative time delay (0.4, 4, and 20 ps). d TA kinetics of SCP and OCP and spin polarization kinetics with single exponential fitting (green line).
