Germanium–Tin/Cadmium Sulfide Core/Shell Nanocrystals with Enhanced Near-Infrared Photoluminescence

doi:10.1021/acs.chemmater.7b01815

Title: Germanium–Tin/Cadmium Sulfide Core/Shell Nanocrystals with Enhanced Near-Infrared Photoluminescence

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Abstract

Ge _1–xSn _x alloy nanocrystals and Ge _1–xSn _x/CdS core/shell nanocrystals were prepared via solution phase synthesis, and their size, composition, and optical properties were characterized. We found that the diameter of the nanocrystal samples ranged from 6 to 13 nm. Furthermore, the crystal structure of the Ge _1–xSn _x materials was consistent with a cubic diamond phase, while the CdS shell was consistent with the zinc blende polytype. Inclusion of Sn alone does not result in enhanced photoluminescence intensity; however, adding an epitaxial CdS shell onto the Ge _1–xSn _x nanocrystals does enhance the photoluminescence up to 15-fold versus that of Ge/CdS nanocrystals with a pure Ge core. There is more effective passivation of surface defects, and a consequent decrease in the level of surface oxidation, by the CdS shell as a result of improved epitaxy (smaller lattice mismatch) is the most likely explanation for the increased photoluminescence observed for the Ge _1–xSn _x/CdS materials. With enhanced photoluminescence in the near-infrared region, Ge _1–xSn _x core/shell nanocrystals might be useful alternatives to other materials for energy capture and conversion applications and as imaging probes.

Authors:

Boote, Brett W. ^[1]; Men, Long ^[1]; Andaraarachchi, Himashi P. ^[1]; Bhattacharjee, Ujjal ^[1];

^[1];

^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Chemistry

Publication Date:: 2017-06-27

Research Org.:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

OSTI Identifier:: 1371893

Report Number(s):: IS-J-9269
Journal ID: ISSN 0897-4756

Grant/Contract Number:: AC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: Chemistry of Materials

Additional Journal Information:: Journal Volume: 29; Journal Issue: 14; Journal ID: ISSN 0897-4756

Publisher:: American Chemical Society (ACS)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats


                    Boote, Brett W., Men, Long, Andaraarachchi, Himashi P., Bhattacharjee, Ujjal, Petrich, Jacob W., Vela, Javier, and Smith, Emily A. Germanium–Tin/Cadmium Sulfide Core/Shell Nanocrystals with Enhanced Near-Infrared Photoluminescence.  United States: N. p., 2017. 
        Web.  doi:10.1021/acs.chemmater.7b01815.

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                    Boote, Brett W., Men, Long, Andaraarachchi, Himashi P., Bhattacharjee, Ujjal, Petrich, Jacob W., Vela, Javier, & Smith, Emily A. Germanium–Tin/Cadmium Sulfide Core/Shell Nanocrystals with Enhanced Near-Infrared Photoluminescence.  United States.  doi:10.1021/acs.chemmater.7b01815.

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                    Boote, Brett W., Men, Long, Andaraarachchi, Himashi P., Bhattacharjee, Ujjal, Petrich, Jacob W., Vela, Javier, and Smith, Emily A. Tue .  
        "Germanium–Tin/Cadmium Sulfide Core/Shell Nanocrystals with Enhanced Near-Infrared Photoluminescence".  United States.  doi:10.1021/acs.chemmater.7b01815.  https://www.osti.gov/servlets/purl/1371893.

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@article{osti_1371893,

  title        = {Germanium–Tin/Cadmium Sulfide Core/Shell Nanocrystals with Enhanced Near-Infrared Photoluminescence},

  author       = {Boote, Brett W. and Men, Long and Andaraarachchi, Himashi P. and Bhattacharjee, Ujjal and Petrich, Jacob W. and Vela, Javier and Smith, Emily A.},

  abstractNote = {Ge1–xSnx alloy nanocrystals and Ge1–xSnx/CdS core/shell nanocrystals were prepared via solution phase synthesis, and their size, composition, and optical properties were characterized. We found that the diameter of the nanocrystal samples ranged from 6 to 13 nm. Furthermore, the crystal structure of the Ge1–xSnx materials was consistent with a cubic diamond phase, while the CdS shell was consistent with the zinc blende polytype. Inclusion of Sn alone does not result in enhanced photoluminescence intensity; however, adding an epitaxial CdS shell onto the Ge1–xSnx nanocrystals does enhance the photoluminescence up to 15-fold versus that of Ge/CdS nanocrystals with a pure Ge core. There is more effective passivation of surface defects, and a consequent decrease in the level of surface oxidation, by the CdS shell as a result of improved epitaxy (smaller lattice mismatch) is the most likely explanation for the increased photoluminescence observed for the Ge1–xSnx/CdS materials. With enhanced photoluminescence in the near-infrared region, Ge1–xSnx core/shell nanocrystals might be useful alternatives to other materials for energy capture and conversion applications and as imaging probes.},

  doi          = {10.1021/acs.chemmater.7b01815},

  journal      = {Chemistry of Materials},

  number       = 14,

  volume       = 29,

  place        = {United States},

  year         = {2017},

  month        = {6}

}

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DOI: 10.1021/acs.chemmater.7b01815

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