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Research Article

Enhanced photoluminescence quantum yield of MAPbBr3 nanocrystals by passivation using graphene

Youngsin Park1,§, Atanu Jana1,§, Chang Woo Myung1,§, Taeseung Yoon1, Geungsik Lee1, Claudius C. Kocher2, Guanhua Ying2, Vitaly Osokin2, Robert A. Taylor2( ), Kwang S. Kim1( )
School of Natural Science, Ulsan National Institute of Science and Technologh, Ulsan 44919, Republic of Korea
Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, UK

§ Youngsin Park, Atanu Jana and Chang Woo Myung contributed equally to this work.

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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 MAPbBr3 (MA = methylammonium) clusters comprising nanocrystals with diameters ranging between 20 and 30 nm and characterized an enhanced photoluminescence (PL) quantum yield (as much as ~ 7 times) by encapsulating the MAPbBr3 with graphene (Gr). The optical properties of MAPbBr3 and Gr/MAPbBr3 were investigated by temperature-dependent micro-PL and time-resolved PL measurements. Density functional theory calculations show that the surface defect states in MAPbBr3 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.

Keywords

perovskite nanoclusterphotoluminescencesurface passivationgraphenedensity functional theory calculations

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Nano Research
Volume 13 Issue 4,
April 2020
Pages 932-938
DOI: 10.1007/s12274-020-2718-8
Cite this article:
Park Y, Jana A, Myung CW, et al. Enhanced photoluminescence quantum yield of MAPbBr3 nanocrystals by passivation using graphene. Nano Research, 2020, 13(4): 932-938. https://doi.org/10.1007/s12274-020-2718-8
Topics:
Energy gapGrapheneLattice theoryLead compoundsNanocrystalsOptical latticesOptical propertiesOptoelectronic devicesPerovskitePhotoluminescenceQuantum yieldSemiconductor quantum wellsSurface defectsSurface states

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Received: 08 January 2020
Revised: 13 February 2020
Accepted: 14 February 2020
Published: 09 March 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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