Time-resolved photoluminescence properties of CuInS 2/ZnS nanocrystals: Influence of intrinsic defects and external impurities

Vamsi K. Komarala; Chuang Xie; Yongqiang Wang; Jian Xu; Min Xiao

doi:10.1063/1.4730345

Time-resolved photoluminescence properties of CuInS ₂/ZnS nanocrystals: Influence of intrinsic defects and external impurities

Vamsi K. Komarala, Chuang Xie, Yongqiang Wang, Jian Xu, Min Xiao

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Abstract

Photoluminescence (PL) lifetime studies of CuInS ₂ nanocrystals (NCs) are carried out after synthesizing core-shell and compositionally variant structures using time-resolved PL spectroscopy. Long-lived excited state decay times are observed for the NCs, and decay times are very much dependent on the size of the CuInS ₂ NCs. The emission bands are attributed to the surface (shorter PL lifetime) and defect (longer PL lifetime) related trap states, respectively. The decay dynamics of the CuInS ₂ NC's excited-state carriers is very sensitive to the surface, intrinsic defects, and extrinsic impurities. The observed large Stokes shifts and broad PL spectra also reveal the involvement of the defect-related trapping sites in the emission process.

Original language	English (US)
Article number	124314
Journal	Journal of Applied Physics
Volume	111
Issue number	12
DOIs	https://doi.org/10.1063/1.4730345
State	Published - Jun 15 2012

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1063/1.4730345

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title = "Time-resolved photoluminescence properties of CuInS 2/ZnS nanocrystals: Influence of intrinsic defects and external impurities",

abstract = "Photoluminescence (PL) lifetime studies of CuInS 2 nanocrystals (NCs) are carried out after synthesizing core-shell and compositionally variant structures using time-resolved PL spectroscopy. Long-lived excited state decay times are observed for the NCs, and decay times are very much dependent on the size of the CuInS 2 NCs. The emission bands are attributed to the surface (shorter PL lifetime) and defect (longer PL lifetime) related trap states, respectively. The decay dynamics of the CuInS 2 NC's excited-state carriers is very sensitive to the surface, intrinsic defects, and extrinsic impurities. The observed large Stokes shifts and broad PL spectra also reveal the involvement of the defect-related trapping sites in the emission process.",

author = "Komarala, {Vamsi K.} and Chuang Xie and Yongqiang Wang and Jian Xu and Min Xiao",

note = "Funding Information: We acknowledge the partial financial support from the National Science Foundation through the MRSEC Program.",

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doi = "10.1063/1.4730345",

language = "English (US)",

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T1 - Time-resolved photoluminescence properties of CuInS 2/ZnS nanocrystals

T2 - Influence of intrinsic defects and external impurities

AU - Komarala, Vamsi K.

AU - Xie, Chuang

AU - Wang, Yongqiang

AU - Xu, Jian

AU - Xiao, Min

N1 - Funding Information: We acknowledge the partial financial support from the National Science Foundation through the MRSEC Program.

PY - 2012/6/15

Y1 - 2012/6/15

N2 - Photoluminescence (PL) lifetime studies of CuInS 2 nanocrystals (NCs) are carried out after synthesizing core-shell and compositionally variant structures using time-resolved PL spectroscopy. Long-lived excited state decay times are observed for the NCs, and decay times are very much dependent on the size of the CuInS 2 NCs. The emission bands are attributed to the surface (shorter PL lifetime) and defect (longer PL lifetime) related trap states, respectively. The decay dynamics of the CuInS 2 NC's excited-state carriers is very sensitive to the surface, intrinsic defects, and extrinsic impurities. The observed large Stokes shifts and broad PL spectra also reveal the involvement of the defect-related trapping sites in the emission process.

AB - Photoluminescence (PL) lifetime studies of CuInS 2 nanocrystals (NCs) are carried out after synthesizing core-shell and compositionally variant structures using time-resolved PL spectroscopy. Long-lived excited state decay times are observed for the NCs, and decay times are very much dependent on the size of the CuInS 2 NCs. The emission bands are attributed to the surface (shorter PL lifetime) and defect (longer PL lifetime) related trap states, respectively. The decay dynamics of the CuInS 2 NC's excited-state carriers is very sensitive to the surface, intrinsic defects, and extrinsic impurities. The observed large Stokes shifts and broad PL spectra also reveal the involvement of the defect-related trapping sites in the emission process.

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Time-resolved photoluminescence properties of CuInS ₂/ZnS nanocrystals: Influence of intrinsic defects and external impurities

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