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

Boote, Brett W.; Men, Long; Andaraarachchi, Himashi P.; Bhattacharjee, Ujjal; Petrich, Jacob W.; Vela, Javier; Smith, Emily A.

doi:10.1021/acs.chemmater.7b01815

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

Journal Article · Tue Jun 27 00:00:00 EDT 2017 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.7b01815· OSTI ID:1371893

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

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

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.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

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

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1371893

Report Number(s):: IS-J--9269

Journal Information:: Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 14 Vol. 29; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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