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

doi:10.1007/s12274-020-2718-8

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 journal › Article › peer-review

15 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 language	English
Pages (from-to)	932-938
Number of pages	7
Journal	Nano Research
Volume	13
Issue number	4
DOIs	https://doi.org/10.1007/s12274-020-2718-8
State	Published - 1 Apr 2020
Externally published	Yes

Keywords

density functional theory calculations
graphene
perovskite nanocluster
photoluminescence
surface passivation

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Access to Document

10.1007/s12274-020-2718-8

Cite this

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title = "Enhanced photoluminescence quantum yield of MAPbBr3 nanocrystals by passivation using graphene",

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 \textasciitilde{} 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.].",

keywords = "density functional theory calculations, graphene, perovskite nanocluster, photoluminescence, surface passivation",

author = "Youngsin Park and Atanu Jana and Myung, \{Chang Woo\} and Taeseung Yoon and Geungsik Lee and Kocher, \{Claudius C.\} and Guanhua Ying and Vitaly Osokin and Taylor, \{Robert A.\} and Kim, \{Kwang S.\}",

note = "Publisher Copyright: {\textcopyright} 2020, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature.",

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doi = "10.1007/s12274-020-2718-8",

language = "English",

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T1 - Enhanced photoluminescence quantum yield of MAPbBr3 nanocrystals by passivation using graphene

AU - Park, Youngsin

AU - Jana, Atanu

AU - Myung, Chang Woo

AU - Yoon, Taeseung

AU - Lee, Geungsik

AU - Kocher, Claudius C.

AU - Ying, Guanhua

AU - Osokin, Vitaly

AU - Taylor, Robert A.

AU - Kim, Kwang S.

PY - 2020/4/1

Y1 - 2020/4/1

N2 - 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.].

AB - 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.].

KW - density functional theory calculations

KW - graphene

KW - perovskite nanocluster

KW - photoluminescence

KW - surface passivation

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DO - 10.1007/s12274-020-2718-8

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JO - Nano Research

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