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- Lee, Geunsik
- 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, Youngsin, Jana, Atanu, Myung, Chang Woo, Yoon, Taeseung, Lee, Geungsik, Kocher, Claudius C., Ying, Guanhua, Osokin, Vitaly, Taylor, Robert A., Kim, Kwang S.
- Issued Date
- 2020-04
- 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
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