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Strong self-trapping by deformation potential limits photovoltaic performance in bismuth double perovskite
South China Normal Univ, Peoples R China; Nanyang Technol Univ, Singapore; Chinese Acad Sci, Peoples R China; Chinese Acad Sci, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
Nanyang Technol Univ, Singapore.
Nanyang Technol Univ, Singapore.
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2021 (English)In: Science Advances, E-ISSN 2375-2548, Vol. 7, no 8, article id eabd3160Article in journal (Refereed) Published
Abstract [en]

Bismuth-based double perovskite Cs2AgBiBr6 is regarded as a potential candidate for low-toxicity, high-stability perovskite solar cells. However, its performance is far from satisfactory. Albeit being an indirect bandgap semiconductor, we observe bright emission with large bimolecular recombination coefficient (reaching 4.5 +/- 0.1 x 10(-11) cm(3) s(-1)) and low charge carrier mobility (around 0.05 cm(2) s(-1) V-1). Besides intermediate Frohlich couplings present in both Pb-based perovskites and Cs2AgBiBr6, we uncover evidence of strong deformation potential by acoustic phonons in the latter through transient reflection, time-resolved terahertz measurements, and density functional theory calculations. The Frohlich and deformation potentials synergistically lead to ultrafast self-trapping of free carriers forming polarons highly localized on a few units of the lattice within a few picoseconds, which also breaks down the electronic band picture, leading to efficient radiative recombination. The strong self-trapping in Cs2AgBiBr6 could impose intrinsic limitations for its application in photovoltaics.

Place, publisher, year, edition, pages
American Association for the Advancement of Science , 2021. Vol. 7, no 8, article id eabd3160
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-173880DOI: 10.1126/sciadv.abd3160ISI: 000620146100014PubMedID: 33597239OAI: oai:DiVA.org:liu-173880DiVA, id: diva2:1535932
Note

Funding Agencies|Nanyang Technological UniversityNanyang Technological University [M4080514]; Ministry of Education [MOE2016-T2-1-034]; Science and Technology Program of Guangzhou [2019050001]; National Natural Science Foundation of China (NFSC)National Natural Science Foundation of China (NSFC) [51802331]; National Research Foundation (NRF) SingaporeNational Research Foundation, Singapore [NRF-CRP14-2014-03]; NRF Investigatorship [NRF-NRFI-2018-04]; Guangdong Provincial Key Laboratory of Optical Information Materials and Technology [2017B030301007]; National Center for International Research on Green Optoelectronics; 111 ProjectMinistry of Education, China - 111 Project; Swedish Energy AgencySwedish Energy Agency [2018-004357]; Knut och Alice Wallenbergs StiftelseKnut & Alice Wallenberg Foundation [KAW 2019.0082]; Ministry of Education, SingaporeMinistry of Education, Singapore [AcRF Tier 1, RG191/17, MOE2017]

Available from: 2021-03-09 Created: 2021-03-09 Last updated: 2021-03-30

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