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Enhanced photoluminescence quantum yield of MAPbBr3 nanocrystals by passivation using graphene

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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 20–30 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.

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Acknowledgements

This work was supported by Basic Science Research Program and National Honor Scientist Program through the National Research Foundation of Korea (NRF) (Nos. 2010-0020414, 2015R1D1A1A01058332, 2018R1D1A1B07043676, and 2019R1A4A1029237). K. S. K. acknowledges the support from KISTI (Nos. KSC-2018-CRE-0077 and KSC-2018-CHA-0057). C. W. M. acknowledges the support from KISTI (Nos. KSC-2018-CRE-0071, KSC-2019-CRE-0139, and KSC-2019-CRE-0248).

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

Authors and Affiliations

  1. School of Natural Science, Ulsan National Institute of Science and Technologh, Ulsan, 44919, Republic of Korea

    Youngsin Park, Atanu Jana, Chang Woo Myung, Taeseung Yoon, Geungsik Lee & Kwang S. Kim

  2. Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, UK

    Claudius C. Kocher, Guanhua Ying, Vitaly Osokin & Robert A. Taylor

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  1. Youngsin Park
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Park, Y., Jana, A., Myung, C.W. et al. Enhanced photoluminescence quantum yield of MAPbBr3 nanocrystals by passivation using graphene. Nano Res. 13, 932–938 (2020). https://doi.org/10.1007/s12274-020-2718-8

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