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Efficient Optical Orientation and Slow Spin Relaxation in Lead-Free CsSnBr3 Perovskite Nanocrystals
Liang, Wenfei1,2,3; Li, Yulu1,2; Xiang, Dongmei1,2; Han, Yaoyao1,2,4; Jiang, Qike5; Zhang, Wei3; Wu, Kaifeng1,2
2021-05-14
摘要Spin properties of lead halide perovskites have recently received considerable research attention, because the strong spin-orbit coupling (SOC) enables facile optical orientation of spin-polarized states, a property particularly useful for information science and spintronics. The strong SOC, however, also limits the spin relaxation lifetime. Herein, we study optical orientation and spin relaxation in lead-free CsSnBr3 perovskite nanocrystals. The SOC of CsSnBr3 (similar to 0.43 eV) is 3.5-fold weaker than that of lead halide perovskites but is still strong enough to ensure efficient optical orientation. Meanwhile, the room-temperature spin lifetime is prolonged to 18 +/- 2 ps, longer than the reported lifetimes of various lead halide perovskites, and it is likely limited by electron-hole exchange rather than SOC. These results demonstrate the strong potential of nontoxic tin halide perovskites for spin-related applications.
DOI10.1021/acsenergylett.1c00413
发表期刊ACS ENERGY LETTERS
ISSN2380-8195
卷号6期号:5页码:1670-1676
通讯作者Zhang, Wei(zhangwei@cigit.ac.cn) ; Wu, Kaifeng(kwu@dicp.ac.cn)
收录类别SCI
WOS记录号WOS:000651810400002
语种英语