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

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:
 [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Chemistry
Publication Date:
Report Number(s):
IS-J-9269
Journal ID: ISSN 0897-4756
Grant/Contract Number:
AC02-07CH11358
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)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1371893

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., Web. doi:10.1021/acs.chemmater.7b01815.
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.
Boote, Brett W., Men, Long, Andaraarachchi, Himashi P., Bhattacharjee, Ujjal, Petrich, Jacob W., Vela, Javier, and Smith, Emily A.. 2017. "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.
@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}
}