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Using Mechanical Stress to Investigate the Rashba Effect in Organic-Inorganic Hybrid Perovskites
KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics. Peking Univ, Sch Phys, Collaborat Innovat Ctr Quantum Matter, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China..
Beijing Inst Technol, Sch Mat Sci & Engn, 5 South St Zhongguancun, Beijing 100081, Peoples R China.;Beijing Inst Technol, Adv Res Inst Multidisciplinary Sci, 5 South St Zhongguancun, Beijing 100081, Peoples R China..
Beijing Inst Technol, Sch Mat Sci & Engn, 5 South St Zhongguancun, Beijing 100081, Peoples R China.;Yangtze River Storage Technol Co Ltd, Gaoxin Fourth Rd, Wuhan 430000, Hubei, Peoples R China..
Beijing Inst Technol, Sch Mat Sci & Engn, 5 South St Zhongguancun, Beijing 100081, Peoples R China.;Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China..
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2019 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 10, no 18, p. 5451-5457Article in journal (Refereed) Published
Abstract [en]

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 (MAPbI(3-x)Cl(x)) 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 B-0 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.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 10, no 18, p. 5451-5457
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Physical Chemistry
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URN: urn:nbn:se:kth:diva-261956DOI: 10.1021/acs.jpclett.9b01985ISI: 000487178900025PubMedID: 31461614Scopus ID: 2-s2.0-85072508753OAI: oai:DiVA.org:kth-261956DiVA, id: diva2:1361034
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QC 20191015

Available from: 2019-10-15 Created: 2019-10-15 Last updated: 2019-10-15Bibliographically approved

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Liu, LigePevere, FedericoSychugov, Ilya

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