Carrier Spin Dynamics in Perovskite Materials Revealed by Transient Absorption Spectroscopy: Progress and Perspectives

ABSTRACT Perovskite materials have emerged as an ideal platform for investigating spin generation, relaxation, and manipulation, due to their strong spin‐orbit coupling and highly tunable crystal structures. These attributes make them particularly attractive for spin‐optoelectronic studies. With the incorporation of chiral components, perovskites further exhibit distinctive chirality‐induced spin selectivity and circularly polarized luminescence, thus broadening the scope of spin‐functional materials. Transient absorption spectroscopy (TAS) provides a powerful means to probe the spintronic dynamics in perovskites. This review aims to summarize recent progress in the spintronic properties of both achiral and chiral perovskites, which are revealed by TAS. First, the main spin relaxation mechanisms in semiconductors are introduced, including the Elliott‐Yafet, Bir‐Aronov‐Pikus, and D'yakonov‐Perel mechanisms, as well as the spin funneling and the optical Stark effect. Subsequently, recent advances in spin generation, relaxation, and applications of achiral and chiral perovskites are discussed. Finally, the current challenges and future perspectives in the study of spintronic dynamics in perovskites are outlined.