Solvent-assisted surface engineering for high-performance all-inorganic perovskite nanocrystal light-emitting diodes

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage19835en_US
dc.citation.issueNumber23en_US
dc.citation.spage19828en_US
dc.citation.volumeNumber10en_US
dc.contributor.authorWang, L.en_US
dc.contributor.authorLiu, B.en_US
dc.contributor.authorZhao, X.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.contributor.authorGu, H.en_US
dc.contributor.authorSun, H.en_US
dc.date.accessioned2019-02-21T16:02:20Zen_US
dc.date.available2019-02-21T16:02:20Zen_US
dc.date.issued2018en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractAll-inorganic cesium halide perovskite nanocrystals have attracted much interest in optoelectronic applications for the sake of the readily adjustable band gaps, high photoluminescence quantum yield, pure color emission, and affordable cost. However, because of the ineluctable utilization of organic surfactants during the synthesis, the structural and optical properties of CsPbBr3 nanocrystals degrade upon transforming from colloidal solutions to solid thin films, which plagues the device operation. Here, we develop a novel solvent-assisted surface engineering strategy, producing high-quality CsPbBr3 thin films for device applications. A good solvent is first introduced as an assembly trigger to conduct assembly in a one-dimensional direction, which is then interrupted by adding a nonsolvent. The nonsolvent drives the adjacent nanoparticles connecting in a two-dimensional direction. Assembled CsPbBr3 nanocrystal thin films are densely packed and very smooth with a surface roughness of ∼4.8 nm, which is highly desirable for carrier transport in a light-emitting diode (LED) device. Meanwhile, the film stability is apparently improved. Benefiting from this facile and reliable strategy, we have achieved remarkably improved performance of CsPbBr3 nanocrystal-based LEDs. Our results not only enrich the methods of nanocrystal surface engineering but also shed light on developing high-performance LEDs.en_US
dc.description.provenanceMade available in DSpace on 2019-02-21T16:02:20Z (GMT). No. of bitstreams: 1 Bilkent-research-paper.pdf: 222869 bytes, checksum: 842af2b9bd649e7f548593affdbafbb3 (MD5) Previous issue date: 2018en_US
dc.description.sponsorshipThis work was supported by the Singapore Ministry of Education through the Academic Research Fund under Projects MOE2016-T2-1-054, Tier 1-RG105/16 and Tier 1-RG92/15 and China Scholarship Council (20163100, no. 201608420137). Thanks to the support of the National Research Foundation, Prime Minister’s Office, Singapore under its Competitive Research program (NRF-CRP14-2014-03), its Investigatorship program (NRF-NRFI2016-08) and the Singapore Agency for Science, Technology and Research (A*STAR) SERC Pharos Program under grant no. 152 73 00025. H.V.D. gratefully acknowledges TUBA-GEBIP.en_US
dc.identifier.doi10.1021/acsami.8b06105en_US
dc.identifier.eissn1944-8252en_US
dc.identifier.issn1944-8244en_US
dc.identifier.urihttp://hdl.handle.net/11693/49994
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttps://doi.org/10.1021/acsami.8b06105en_US
dc.relation.projectChina Scholarship Council, CSC: 201608420137 - China Scholarship Council, CSC: 20163100 - NRF-CRP14-2014-03 - NRF-NRFI2016-08 - Ministry of Education - Singapore, MOE: MOE2016-T2-1-054 - Ministry of Education - Singapore, MOE: 1-RG92/15 - Agency for Science, Technology and Research, A*STAR - National Research Foundation, NRF - 152 73 00025en_US
dc.source.titleACS Applied Materials and Interfacesen_US
dc.subjectCsPbBr3 nanocrystalsen_US
dc.subjectLight-emitting diodesen_US
dc.subjectPhotoluminescenceen_US
dc.subjectSelf-assemblyen_US
dc.subjectSolvent engineeringen_US
dc.titleSolvent-assisted surface engineering for high-performance all-inorganic perovskite nanocrystal light-emitting diodesen_US
dc.typeArticleen_US

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Department of Electrical and Electronics Engineering
Department of Physics
Institute of Materials Science and Nanotechnology (UNAM)