Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.161
Publication date: 7th February 2022
This talk will address the influence of doping on the optical and magneto-optical properties of lead halide perovskites, revealing possibilities of their implementation in various spin-based applications. The Ni2+ ions were embedded into cesium lead halide-perovskite via a combined cation/anion exchange process. This study uses a thorough investigation of Ni2+ doping effects on the magneto-optical properties of CsPb(BrxCl1-x)3 nanocubes, monitored by extensive spectroscopic methods such as steady-state, transient and magneto photoluminescence (PL) spectroscopy which recorded at various temperatures. The PL decay curve showed evidence for charge carrier trapping. The magneto-PL measurements revealed the occurrence of multiple recombination events with different degrees of circular polarization (DCP), with an apparent contrasting behavior in the undoped and doped samples. These observations unfold energy splitting of the bright triplet states (ms = ±1 components) and the existence of emission processes related to delayed fluorescence by carrier localization at trapping sites (also confirmed by ODMR). The study reveals the role of the dopant in stiffening the entire crystal to the degree that enabled resolving the identification of carriers' localization sites.
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