Graphene quantum dots with nitrogen and oxygen derived from simultaneous reaction of solvent as exfoliant and dopant

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dc.contributor.authorKang, Gil-Seongko
dc.contributor.authorLee, Sunghoko
dc.contributor.authorYeo, Jun-Seokko
dc.contributor.authorChoi, Eun-Suko
dc.contributor.authorLee, Doh C.ko
dc.contributor.authorNa, Seok-Inko
dc.contributor.authorJoh, Han-Ikko
dc.date.accessioned2019-07-05T06:50:05Z-
dc.date.available2019-07-05T06:50:05Z-
dc.date.created2019-07-01-
dc.date.issued2019-09-
dc.identifier.citationCHEMICAL ENGINEERING JOURNAL, v.372, pp.624 - 630-
dc.identifier.issn1385-8947-
dc.identifier.urihttp://hdl.handle.net/10203/262996-
dc.description.abstractGraphene quantum dots (GQDs) are promising materials for optoelectronic devices because their band-gap, derived from quantum confinement and edge effects, can be easily tuned via their size or surface/edge states. In this paper, a novel approach to synthesize nitrogen-and oxygen-doped GQDs (NO-GQDs) is presented. Nitrogen and oxygen are mainly bound at the GQD edges, resulting in high crystallinity and good electrical properties. A simple solvothermal reaction using N-methyl-2-pyrrolidone (NMP), whose surface energy is similar to that of graphite as a raw material, can simultaneously exfoliate, cut, and finally transform the graphite into the GQDs with heteroatoms derived from the decomposed NMP solution. The synthesized NO-GQDs have a less defective and more selectively edge-functionalized structure compared to other reported GQDs. The electrical properties of NO-GQDs are investigated using them as the additive of hole-transporting materials (HTMs) in an optoelectronic device such as perovskite solar cells (PeSCs). Compared with PEDOT:PSS, a mixture of NO-GQDs and PEDOT:PSS shows a 36.2% increase in the power conversion efficiency (PCE) (maximum PCE: 11.47%) and good device stability. Therefore, it is believed that the improvement of photovoltaics is solely attributed from NO-GQDs which act as a positive role of faster hole transfer. We could confirm that the NO-GQDs facilitate hole-extraction from a photoactive layer and guarantee the more stable operation of PeSCs.-
dc.languageEnglish-
dc.publisherELSEVIER SCIENCE SA-
dc.titleGraphene quantum dots with nitrogen and oxygen derived from simultaneous reaction of solvent as exfoliant and dopant-
dc.typeArticle-
dc.identifier.wosid000471670400059-
dc.identifier.scopusid2-s2.0-85064863269-
dc.type.rimsART-
dc.citation.volume372-
dc.citation.beginningpage624-
dc.citation.endingpage630-
dc.citation.publicationnameCHEMICAL ENGINEERING JOURNAL-
dc.identifier.doi10.1016/j.cej.2019.04.192-
dc.contributor.localauthorLee, Doh C.-
dc.contributor.nonIdAuthorLee, Sungho-
dc.contributor.nonIdAuthorYeo, Jun-Seok-
dc.contributor.nonIdAuthorChoi, Eun-Su-
dc.contributor.nonIdAuthorNa, Seok-In-
dc.contributor.nonIdAuthorJoh, Han-Ik-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorGraphene-
dc.subject.keywordAuthorNitrogen and oxygen doped graphene quantum dots (NO-GQDs)-
dc.subject.keywordAuthorSolvothermal reaction-
dc.subject.keywordAuthorGraphite exfoliation-
dc.subject.keywordAuthorPerovskite solar cells-
dc.subject.keywordAuthorHole-transporting materials (HTMs)-
dc.subject.keywordPlusLARGE-SCALE PREPARATION-
dc.subject.keywordPlusPEROVSKITE SOLAR-CELLS-
dc.subject.keywordPlusTUNABLE PHOTOLUMINESCENCE-
dc.subject.keywordPlusCARRIER SEPARATION-
dc.subject.keywordPlusOXIDE-
dc.subject.keywordPlusEFFICIENT-
dc.subject.keywordPlusPERFORMANCE-
dc.subject.keywordPlusSIZE-
dc.subject.keywordPlusGRAPHITE-
dc.subject.keywordPlusWATER-
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