globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1805422115
论文题名:
Structural fluctuations cause spin-split states in tetragonal (CH 3 NH 3 )PbI 3 as evidenced by the circular photogalvanic effect
作者: Niesner D.; Hauck M.; Shrestha S.; Levchuk I.; Matt G.J.; Osvet A.; Batentschuk M.; Brabec C.; Weber H.B.; Fauster T.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:38
起始页码: 9509
结束页码: 9514
语种: 英语
英文关键词: Circular photogalvanic effect ; Dynamical rashba ; Lead halide perovskite ; Organic–inorganic perovskite ; Rashba effect
Scopus关键词: article ; crystal structure ; excitation ; phase transition ; photon ; room temperature ; temperature sensitivity
英文摘要: Lead halide perovskites are used in thin-film solar cells, which owe their high efficiency to the long lifetimes of photocarriers. Various calculations find that a dynamical Rashba effect could significantly contribute to these long lifetimes. This effect is predicted to cause a spin splitting of the electronic bands of inversion-symmetric crystalline materials at finite temperatures, resulting in a slightly indirect band gap. Direct experimental evidence of the existence or the strength of the spin splitting is lacking. Here, we resonantly excite photocurrents in single crystalline (CH 3 NH 3 )PbI 3 with circularly polarized light to clarify the existence of spin splittings in the band structure. We observe a circular photogalvanic effect, i.e., the photocurrent depends on the light helicity, in both orthorhombic and tetragonal (CH 3 NH 3 )PbI 3 . At room temperature, the effect peaks for excitation photon energies ∆E = 110 meV below the direct optical band gap. Temperature-dependent measurements reveal a sign change of the effect at the orthorhombic–tetragonal phase transition, indicating different microscopic origins in the two phases. Within the tetragonal phase, both ∆E and the amplitude of the circular photogalvanic effect increase with temperature. Our findings support a dynamical Rashba effect in this phase, i.e., a spin splitting caused by thermally induced structural fluctuations which break inversion symmetry. © 2018 National Academy of Sciences. All rights reserved.
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被引频次[WOS]:104   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163659
Appears in Collections:气候变化与战略

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作者单位: Niesner, D., Lehrstuhl für Festkörperphysik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, 91058, Germany; Hauck, M., Lehrstuhl für Angewandte Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, 91058, Germany; Shrestha, S., Institute of Materials for Electronics and Energy Technology, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, 91058, Germany; Levchuk, I., Institute of Materials for Electronics and Energy Technology, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, 91058, Germany; Matt, G.J., Institute of Materials for Electronics and Energy Technology, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, 91058, Germany; Osvet, A., Institute of Materials for Electronics and Energy Technology, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, 91058, Germany; Batentschuk, M., Institute of Materials for Electronics and Energy Technology, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, 91058, Germany; Brabec, C., Institute of Materials for Electronics and Energy Technology, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, 91058, Germany, Bavarian Center for Applied Energy Research, Erlangen, 91058, Germany; Weber, H.B., Lehrstuhl für Angewandte Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, 91058, Germany; Fauster, T., Lehrstuhl für Festkörperphysik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, 91058, Germany

Recommended Citation:
Niesner D.,Hauck M.,Shrestha S.,et al. Structural fluctuations cause spin-split states in tetragonal (CH 3 NH 3 )PbI 3 as evidenced by the circular photogalvanic effect[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(38)
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