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Title: Surface-enhanced spin current to charge current conversion efficiency in CH3NH3PbBr3-based devices

Abstract

Hybrid organic-inorganic perovskites have shown great promise for spintronic applications due to their large spin-orbit coupling induced by the Pb and halogen atoms. Particularly, the large observed surface-induced Rashba splitting in CH3NH3PbBr3 indicates efficient spin-current-to-charge-current (StC) conversion, which, however, has not been demonstrated yet. In this work, the StC conversion efficiency in ferromagnet/CH3NH3PbBr3-based devices is studied using the pulsed spin-pumping technique measured by the inverse spin Hall effect. We found that the StC conversion efficiency is anomalous in that it increases at small perovskite layer thickness. This indicates the existence of a surface-dominated StC mechanism such as the inverse Rashba-Edelstein effect. By inserting a thin LiF layer between the ferromagnet and the perovskite film, the StC conversion efficiency is greatly suppressed, validating the existence of a Rashba surface in the CH3NH3PbBr3 film.

Authors:
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Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1573426
Grant/Contract Number:  
SC0014579
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Name: Journal of Chemical Physics Journal Volume: 151 Journal Issue: 17; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English

Citation Formats

Sun, Dali, Zhang, Chuang, Kavand, Marzieh, Wang, Jingying, Malissa, Hans, Liu, Haoliang, Popli, Henna, Singh, Jaspal, Vardeny, Shai R., Zhang, Wei, Boehme, Christoph, and Vardeny, Z. Valy. Surface-enhanced spin current to charge current conversion efficiency in CH3NH3PbBr3-based devices. United States: N. p., 2019. Web. doi:10.1063/1.5125230.
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Sun, Dali, Zhang, Chuang, Kavand, Marzieh, Wang, Jingying, Malissa, Hans, Liu, Haoliang, Popli, Henna, Singh, Jaspal, Vardeny, Shai R., Zhang, Wei, Boehme, Christoph, & Vardeny, Z. Valy. Surface-enhanced spin current to charge current conversion efficiency in CH3NH3PbBr3-based devices. United States. https://doi.org/10.1063/1.5125230
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Sun, Dali, Zhang, Chuang, Kavand, Marzieh, Wang, Jingying, Malissa, Hans, Liu, Haoliang, Popli, Henna, Singh, Jaspal, Vardeny, Shai R., Zhang, Wei, Boehme, Christoph, and Vardeny, Z. Valy. Thu . "Surface-enhanced spin current to charge current conversion efficiency in CH3NH3PbBr3-based devices". United States. https://doi.org/10.1063/1.5125230.
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@article{osti_1573426,
title = {Surface-enhanced spin current to charge current conversion efficiency in CH3NH3PbBr3-based devices},
author = {Sun, Dali and Zhang, Chuang and Kavand, Marzieh and Wang, Jingying and Malissa, Hans and Liu, Haoliang and Popli, Henna and Singh, Jaspal and Vardeny, Shai R. and Zhang, Wei and Boehme, Christoph and Vardeny, Z. Valy},
abstractNote = {Hybrid organic-inorganic perovskites have shown great promise for spintronic applications due to their large spin-orbit coupling induced by the Pb and halogen atoms. Particularly, the large observed surface-induced Rashba splitting in CH3NH3PbBr3 indicates efficient spin-current-to-charge-current (StC) conversion, which, however, has not been demonstrated yet. In this work, the StC conversion efficiency in ferromagnet/CH3NH3PbBr3-based devices is studied using the pulsed spin-pumping technique measured by the inverse spin Hall effect. We found that the StC conversion efficiency is anomalous in that it increases at small perovskite layer thickness. This indicates the existence of a surface-dominated StC mechanism such as the inverse Rashba-Edelstein effect. By inserting a thin LiF layer between the ferromagnet and the perovskite film, the StC conversion efficiency is greatly suppressed, validating the existence of a Rashba surface in the CH3NH3PbBr3 film.},
doi = {10.1063/1.5125230},
journal = {Journal of Chemical Physics},
number = 17,
volume = 151,
place = {United States},
year = {Thu Nov 07 00:00:00 EST 2019},
month = {Thu Nov 07 00:00:00 EST 2019}
}
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Journal Article:
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Accepted Manuscript (Publisher)
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https://doi.org/10.1063/1.5125230
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