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Computational Research on Electronic Structure and Transport in Condensed Materials
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Enhanced photoluminescence quantum yield of MAPbBr(3) nanocrystals by passivation using graphene

Author(s)
Park, YoungsinJana, AtanuMyung, Chang WooYoon, TaeseungLee, GeungsikKocher, Claudius C.Ying, GuanhuaOsokin, VitalyTaylor, Robert A.Kim, Kwang S.
Issued Date
2020-04
DOI
10.1007/s12274-020-2718-8
URI
https://scholarworks.unist.ac.kr/handle/201301/32207
Fulltext
https://link.springer.com/article/10.1007%2Fs12274-020-2718-8
Citation
NANO RESEARCH, v.13, no.4, pp.932 - 938
Abstract
Diminishing surface defect states in perovskite nanocrystals is a highly challenging subject for enhancing optoelectronic device performance. We synthesized organic/inorganic lead-halide perovskite MAPbBr(3) (MA = methylammonium) clusters comprising nanocrystals with diameters ranging between 20-30 nm and characterized an enhanced photoluminescence (PL) quantum yield (as much as ~ 7 times) by encapsulating the MAPbBr(3) with graphene (Gr). The optical properties of MAPbBr(3) and Gr/MAPbBr(3) were investigated by temperature-dependent micro-PL and time-resolved PL measurements. Density functional theory calculations show that the surface defect states in MAPbBr(3) are removed and the optical band gap is reduced by a 0.15 eV by encapsulation with graphene due to partial restoration of lattice distortions.
Publisher
TSINGHUA UNIV PRESS
ISSN
1998-0124
Keyword (Author)
perovskite nanoclusterphotoluminescencesurface passivationgraphenedensity functional theory calculations
Keyword
TOTAL-ENERGY CALCULATIONSPEROVSKITE NANOCRYSTALSBAND-GAPEFFICIENCYFILMSCELLSEMICONDUCTORSLUMINESCENTDEFECTSHYBRID

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