Experimentelle Physik 2, Technische Universität Dortmund, D-44221, Dortmund, Germany.
Ioffe Institute, Russian Academy of Sciences, 194021, St. Petersburg, Russia.
Nat Commun. 2019 Feb 8;10(1):673. doi: 10.1038/s41467-019-08625-z.
The lead halide perovskites demonstrate huge potential for optoelectronic applications, high energy radiation detectors, light emitting devices and solar energy harvesting. Those materials exhibit strong spin-orbit coupling enabling efficient optical orientation of carrier spins in perovskite-based devices with performance controlled by a magnetic field. Here we show that elaborated time-resolved spectroscopy involving strong magnetic fields can be successfully used for perovskites. We perform a comprehensive study of high-quality lead halide perovskite CsPbBr crystals by measuring the exciton and charge carrier g-factors, spin relaxation times and hyperfine interaction of carrier and nuclear spins by means of coherent spin dynamics. Owing to their 'inverted' band structure, perovskites represent appealing model systems for semiconductor spintronics exploiting the valence band hole spins, while in conventional semiconductors the conduction band electrons are considered for spin functionality.
卤铅钙钛矿在光电应用、高能辐射探测器、发光器件和太阳能收集方面显示出巨大的潜力。这些材料具有很强的自旋轨道耦合，能够在基于钙钛矿的器件中有效地光学定向载流子自旋，其性能可以通过磁场来控制。在这里，我们表明，涉及强磁场的精心设计的时间分辨光谱可以成功地用于钙钛矿。我们通过相干自旋动力学，测量高质量卤铅钙钛矿 CsPbBr 晶体的激子和电荷载流子 g 因子、自旋弛豫时间和载流子与核自旋的超精细相互作用，对其进行了综合研究。由于其“倒置”能带结构，钙钛矿代表了利用价带空穴自旋的半导体自旋电子学的有吸引力的模型系统，而在传统半导体中，传导带电子被认为具有自旋功能。
