Publication date: 15th December 2025
Hybrid lead halide perovskites have shown promising results for spintronics applications [1]. When combined with organic chiral ligands, perovskites have shown to have induced optical activity [2][3]. Studying how different light polarization can affect the spin dynamics of these materials can be important for future optoelectronic devices or spin-dependent properties. The quantification of spin relaxation rate is a relevant task. Here we determine it via kinetic model from a set of polarization-dependent transient absorption (TA) experiments.
Circularly polarized pump-probe (TA) spectroscopy was used to study the dynamics and charge carrier and spin relaxation dynamics of chiral/achiral 2D-lead halide perovskite film of R/S/RAC-MBA2PbI4. Samples were excited with 480 nm and probed with broadband white light, 60 fs laser pulses and a fluence of 8 μJ/cm2 for different pump-probe polarization configurations. An achromatic quarter-wave plate is used to obtain right or left circular polarization of the pump and probe pulses. Spin dynamics and the kinetic constants of the different processes after excitation were obtained including spin recombination constant (Ks). Differences in the spin lifetimes and kinetic constants were observed for different polarization configurations, providing quantitative insight into the carrier dynamics of optical activity. This study provides insights into the pin relaxation rates with dependence of light polarization, which are of interest for future optically active devices.
This work is supported by the European Innovation Council (EIC) Pathfinder Challenges program under project number 101162112 (RADIANT).
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