期刊
NANO LETTERS
卷 20, 期 7, 页码 4724-4730出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b05325
关键词
Halide perovskite nanocrystals; spin relaxation; spin-orbit coupling; spin polarization; Elliott-Yafet
类别
资金
- Bavarian State Ministry of Science, Research, and Arts through the grant Solar Technologies go Hybrid (SolTech)
- Deutsche Forschungsgemeinschaft (DFG) through the excellence cluster e-conversion
- Alexander von Humboldt-Foundation
- China Scholarship Council
Lead halide perovskites (LHPs) exhibit large spin-orbit coupling (SOC), leading to only twofold-degenerate valence and conduction bands and therefore allowing for efficient optical orientation. This makes them ideal materials to study charge carrier spins. With this study we elucidate the spin dynamics of photoexcited charge carriers and the underlying spin relaxation mechanisms in CsPbI3 nanocrystals by employing time-resolved differential transmission spectroscopy (DTS). We find that the photoinduced spin polarization significantly diminishes during thermalization and cooling toward the energetically favorable band edge. Temperature-dependent DTS reveals a decay in spin polarization that is more than 1 order of magnitude faster at room temperature (3 ps) than at cryogenic temperatures (32 ps). We propose that spin relaxation of free charge carriers in large-SOC materials like LHPs occurs as a result of carrier-phonon scattering, as described by the Elliott-Yafet mechanism.
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