Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.118
Publication date: 7th February 2022
Magnetic doping in halide perovskite semiconductors is of timely interest with prospective for their use in opto-electronic and spin-related devices. Here, we report a thorough investigation of the optical and magneto-optical properties of Ni2+-doped caesium lead halide perovskite with a chemical formula CsPb(Br1-xClx)3, implementing steady-state and transient polarized photoluminescence (PL), and optically detected magnetic resonance (ODMR) spectroscopies. ODMR measurements probe magnetic resonance transitions of photo-generated electrons and holes in these emissive excited states, exposing phenomenological g-factors that deviate from those of band-edge charge carriers. Simulations of the ODMR spectra suggest carrier trapping in shallow traps with a slight anisotropic surrounding and with weak electron-hole exchange coupling. Furthermore, we observe substantial broadening of the hole resonance, associated with magnetic exchange coupling between Ni2+ unpaired spins and the trapped hole spin. Overall, these ODMR measurements uncover the role of the dopant in localizing photo-generated carriers while stiffening the crystal structure, and for the first time, provide a direct observation of carrier-dopant spin exchange interactions in metal-halide perovskite nanocrystals. These results offer insight into the influence of magnetic dopants on the electronic structures of metal-halide perovskites, with a view toward emerging spin-based devices made from perovskites.
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