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Degradation and self-repairing in perovskite light-emitting diodes
Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering. Nanjing Univ Aeronaut & Astronaut, Peoples R China; Nanjing Univ Aeronaut & Astronaut, Sweden.
Tech Univ Chemnitz, Germany.
Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-0767-3086
Swiss Fed Labs Mat Sci & Technol, Switzerland.
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2021 (English)In: Matter, ISSN 2590-2393, E-ISSN 2590-2385, Vol. 4, no 11, p. 3710-3724Article in journal (Refereed) Published
Abstract [en]

One of the most critical challenges in perovskite light-emitting diodes (PeLEDs) lies in poor operational stability. Although field dependent ion migration is believed to play an important role in the operation of perovskite optoelectronic devices, a complete understanding of how it affects the stability of PeLEDs is still missing. Here, we report a unique self-repairing behavior that the electroluminescence of moderately degraded PeLEDs can almost completely restore to their initial performance after resting. We find that the accumulated halides within the hole transport layer undergo back diffusion toward the surface of the perovskite layer during resting, repairing the vacancies and thus resulting in electroluminescence recovery. These findings indicate that one of the dominant degradation pathways in PeLEDs is the generation of halide vacancies at perovskite/hole transport layer interface during operation. We thus further passivate this key interface, which results in a high external quantum efficiency of 22.8% and obviously improved operational stability.

Place, publisher, year, edition, pages
Elsevier , 2021. Vol. 4, no 11, p. 3710-3724
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-181481DOI: 10.1016/j.matt.2021.09.007ISI: 000717526500004OAI: oai:DiVA.org:liu-181481DiVA, id: diva2:1615921
Note

Funding Agencies|ERCEuropean Research Council (ERC)European Commission [717026]; Swedish Energy Agency EnergimyndighetenSwedish Energy Agency [48758-1]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]; DFGGerman Research Foundation (DFG)European Commission [SPP 2196, 424216076]; China Scholarship CouncilChina Scholarship Council [201906830040]; Nanjing University of Aeronautics and Astronautics PhD short-term visiting scholar project [180608DF06]; Priority Academic Program Development of Jiangsu Higher Education Institutions; Swiss Federal Office of Energy (SFOE)-BFE [SI/501805-01]

Available from: 2021-12-01 Created: 2021-12-01 Last updated: 2021-12-28

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Teng, PengpengXu, WeidongYin, ChunyangBao, ChunxiongKarlsson, MaxQin, JiajunGao, Feng
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