Cation Tuning of Polaron Barriers in Layered Perovskites for Optical Spin Lifetime Control.

ABSTRACT: Layered metal-halide perovskites (L-MHPs) form self-assembled quantum wells with strongly bound excitons and electron-phonon interactions that promote polaron formation. Due to spin-orbit coupling and Rashba-type spin-splitting of the electronic bands, spin-polarized excitons can be photoexcited with circularly polarized light, making these materials promising in opto-spintronics. Recently, we have shown that photoexcitation with excess energy extends spin-lifetimes in (BA)₂FAPb₂I₇ by over 2 orders of magnitude compared to resonant excitation and attributed this to polaron formation. Here, we study spin-lifetimes in L-MHPs with different A-site cations: (Hexa)₂MAPb₂I₇, (Hexa)₂FAPb₂I₇, (Hexa)<

SUBMITTER: Romano V 

PROVIDER: S-EPMC12442098 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature