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양창덕

Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab.
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dc.citation.endPage 77 -
dc.citation.number 7848 -
dc.citation.startPage 72 -
dc.citation.title NATURE -
dc.citation.volume 591 -
dc.contributor.author Hassan, Yasser -
dc.contributor.author Park, Jong Hyun -
dc.contributor.author Crawford, Michael L. -
dc.contributor.author Sadhanala, Aditya -
dc.contributor.author Lee, Jeongjae -
dc.contributor.author Sadighian, James C. -
dc.contributor.author Mosconi, Edoardo -
dc.contributor.author Shivanna, Ravichandran -
dc.contributor.author Radicchi, Eros -
dc.contributor.author Jeong, Mingyu -
dc.contributor.author Yang, Changduk -
dc.contributor.author Choi, Hyosung -
dc.contributor.author Park, Sung Heum -
dc.contributor.author Song, Myoung Hoon -
dc.contributor.author De Angelis, Filippo -
dc.contributor.author Wong, Cathy Y. -
dc.contributor.author Friend, Richard H. -
dc.contributor.author Lee, Bo Ram -
dc.contributor.author Snaith, Henry J. -
dc.date.accessioned 2023-12-21T16:11:07Z -
dc.date.available 2023-12-21T16:11:07Z -
dc.date.created 2021-03-23 -
dc.date.issued 2021-03 -
dc.description.abstract Lead halide perovskites are promising semiconductors for light-emitting applications because they exhibit bright, bandgap-tunable luminescence with high colour purity(1,2). Photoluminescence quantum yields close to unity have been achieved for perovskite nanocrystals across a broad range of emission colours, and light-emitting diodes with external quantum efficiencies exceeding 20 per cent-approaching those of commercial organic light-emitting diodes-have been demonstrated in both the infrared and the green emission channels(1,3,4). However, owing to the formation of lower-bandgap iodide-rich domains, efficient and colour-stable red electroluminescence from mixed-halide perovskites has not yet been realized(5,6). Here we report the treatment of mixed-halide perovskite nanocrystals with multidentate ligands to suppress halide segregation under electroluminescent operation. We demonstrate colour-stable, red emission centred at 620 nanometres, with an electroluminescence external quantum efficiency of 20.3 per cent. We show that a key function of the ligand treatment is to 'clean' the nanocrystal surface through the removal of lead atoms. Density functional theory calculations reveal that the binding between the ligands and the nanocrystal surface suppresses the formation of iodine Frenkel defects, which in turn inhibits halide segregation. Our work exemplifies how the functionality of metal halide perovskites is extremely sensitive to the nature of the (nano)crystalline surface and presents a route through which to control the formation and migration of surface defects. This is critical to achieve bandgap stability for light emission and could also have a broader impact on other optoelectronic applications-such as photovoltaics-for which bandgap stability is required. -
dc.identifier.bibliographicCitation NATURE, v.591, no.7848, pp.72 - 77 -
dc.identifier.doi 10.1038/s41586-021-03217-8 -
dc.identifier.issn 0028-0836 -
dc.identifier.scopusid 2-s2.0-85101977310 -
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/50566 -
dc.identifier.url https://www.nature.com/articles/s41586-021-03217-8 -
dc.identifier.wosid 000626921700012 -
dc.language 영어 -
dc.publisher NATURE RESEARCH -
dc.title Ligand-engineered bandgap stability in mixed-halide perovskite LEDs -
dc.type Article -
dc.description.isOpenAccess FALSE -
dc.relation.journalWebOfScienceCategory Multidisciplinary Sciences -
dc.relation.journalResearchArea Science & Technology - Other Topics -
dc.type.docType Article -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -
dc.subject.keywordPlus SEGREGATION -
dc.subject.keywordPlus GLUTATHIONE -
dc.subject.keywordPlus PASSIVATION -
dc.subject.keywordPlus PERFORMANCE -
dc.subject.keywordPlus BRIGHT -
dc.subject.keywordPlus LIGHT-EMITTING-DIODES -
dc.subject.keywordPlus ION MIGRATION -
dc.subject.keywordPlus SOLAR-CELLS -
dc.subject.keywordPlus EFFICIENT -

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