Spin Coherence and Spin Relaxation in Hybrid Organic-Inorganic Lead and Mixed Lead-Tin Perovskites

Haochen Zhang; Zehua Zhai; Zhixuan Bi; Han Gao; Meng Ye; Yong Xu; Hairen Tan; Luyi Yang

doi:10.1021/acs.nanolett.3c01734

Spin Coherence and Spin Relaxation in Hybrid Organic-Inorganic Lead and Mixed Lead-Tin Perovskites

Nano Lett. 2023 Sep 13;23(17):7914-7920. doi: 10.1021/acs.nanolett.3c01734. Epub 2023 Aug 29.

Authors

Haochen Zhang^{1

2}, Zehua Zhai¹, Zhixuan Bi¹, Han Gao³, Meng Ye⁴, Yong Xu^{1

5

6}, Hairen Tan^{3

7}, Luyi Yang^{1

2

5

6}

Affiliations

¹ State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
² Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada.
³ National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.
⁴ Graduate School of China Academy of Engineering Physics, Beijing 100193, China.
⁵ Frontier Science Center for Quantum Information, Beijing 100084, China.
⁶ Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
⁷ Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing 210093, China.

PMID: 37642561
DOI: 10.1021/acs.nanolett.3c01734

Abstract

Metal halide perovskites make up a promising class of materials for semiconductor spintronics. Here we report a systematic investigation of coherent spin precession, spin dephasing and spin relaxation of electrons and holes in two hybrid organic-inorganic perovskites MA_0.3FA_0.7PbI₃ and MA_0.3FA_0.7Pb_0.5Sn_0.5I₃ using time-resolved Faraday rotation spectroscopy. With applied in-plane magnetic fields, we observe robust Larmor spin precession of electrons and holes that persists for hundreds of picoseconds. The spin dephasing and relaxation processes are likely to be sensitive to the defect levels. Temperature-dependent measurements give further insights into the spin relaxation channels. The extracted electron Landé g-factors (3.75 and 4.36) are the biggest among the reported values in inorganic or hybrid perovskites. Both the electron and hole g-factors shift dramatically with temperature, which we propose to originate from thermal lattice vibration effects on the band structure. These results lay the foundation for further design and use of lead- and tin-based perovskites for spintronic applications.

Keywords: Landé g-factor; hybrid organic−inorganic perovskites; spin coherence; spin relaxation; ultrafast time-resolved Faraday rotation spectroscopy.