Using Mechanical Stress to Investigate the Rashba
Effect in Organic–Inorganic Hybrid Perovskites
Posted on 2019-08-31 - 19:13
Organic–inorganic
hybrid perovskites simultaneously possess
strong spin–orbit coupling (SOC) and structure inversion asymmetry,
establishing a Rashba effect to influence light emission and photovoltaics.
Here, we use mechanical bending as a convenient approach to investigate
the Rashba effect through SOC in perovskite (MAPbI3–xClx) films by elastically
deforming grains. It is observed that applying a concave bending can
broaden the line shape of the magnetophotocurrent, increasing the
internal magnetic parameter B0 from 121
to 205 mT, which indicates an enhancement on SOC. Interestingly, the
PL lifetime is found to be enlarged from 9.9 to 14.8 ns under this
bending, which suggests that introducing compressive strain can essentially
increase the Rashba effect through SOC, leading to an increase upon
indirect band transition. Furthermore, the PL peak associated with
the Rashba effect is shifted from 776 to 780 nm under this mechanical
bending. Therefore, mechanical bending provides a convenient experimental
method to approach the Rashba effect in hybrid perovskites.
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Yu, Haomiao; Zhang, Qi; Zhang, Yaru; Lu, Kai; Han, Changfeng; Yang, Yijun; et al. (2019). Using Mechanical Stress to Investigate the Rashba
Effect in Organic–Inorganic Hybrid Perovskites. ACS Publications. Collection. https://doi.org/10.1021/acs.jpclett.9b01985
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AUTHORS (11)
HY
Haomiao Yu
QZ
Qi Zhang
YZ
Yaru Zhang
KL
Kai Lu
CH
Changfeng Han
YY
Yijun Yang
KW
Kai Wang
XW
Xi Wang
MW
Miaosheng Wang
JZ
Jia Zhang
BH
Bin Hu