Journal
ACS ENERGY LETTERS
Volume 6, Issue 5, Pages 1670-1676Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c00413
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Funding
- National Natural Science Foundation of China [21975253]
- Ministry of Science and Technology of China [2018YFA0208703]
- Strategic Pilot Science and Technology Project of Chinese Academy of Sciences [XDB17010100]
- Chongqing Talents Program [CQYC201905041]
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The spin properties of lead-free CsSnBr3 perovskite nanocrystals were studied, revealing that despite weaker spin-orbit coupling compared to lead halide perovskites, efficient optical orientation is still possible and a longer spin lifetime was observed. These findings demonstrate the strong potential of non-toxic tin halide perovskites for spin-related applications.
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.
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