Enhanced photoluminescence quantum yield of MAPbBr3 nanocrystals by passivation using graphene

Youngsin Park, Atanu Jana, Chang Woo Myung, Taeseung Yoon, Geungsik Lee, Claudius C. Kocher, Guanhua Ying, Vitaly Osokin, Robert A. Taylor, Kwang S. Kim

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

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. [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)932-938
Number of pages7
JournalNano Research
Volume13
Issue number4
DOIs
StatePublished - 1 Apr 2020

Keywords

  • density functional theory calculations
  • graphene
  • perovskite nanocluster
  • photoluminescence
  • surface passivation

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