Optical properties of colloidal germanium nanocrystals

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Highly crystalline germanium (Ge) nanocrystals in the size range 2--10 nm were grown in inverse micelles and purified and size-separated by high pressure liquid chromatography with on-line optical and electrical diagnostics. The nanocrystals retain the diamond structure of bulk Ge down to at least 2.0 nm (containing about 150 Ge atoms). The background- and impurity-free extinction and photoluminescence (PL) spectra of these nanocrystals revealed rich structure which was interpreted in terms of the bandstructure of Ge shifted to higher energies by quantum confinement. The shifts ranged from {minus}0.1 eV to over 1 eV for the various transitions. PL in the ... continued below

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28 p.

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WILCOXON,JESS P.; PROVENCIO,PAULA P. & SAMARA,GEORGE A. May 1, 2000.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Highly crystalline germanium (Ge) nanocrystals in the size range 2--10 nm were grown in inverse micelles and purified and size-separated by high pressure liquid chromatography with on-line optical and electrical diagnostics. The nanocrystals retain the diamond structure of bulk Ge down to at least 2.0 nm (containing about 150 Ge atoms). The background- and impurity-free extinction and photoluminescence (PL) spectra of these nanocrystals revealed rich structure which was interpreted in terms of the bandstructure of Ge shifted to higher energies by quantum confinement. The shifts ranged from {minus}0.1 eV to over 1 eV for the various transitions. PL in the range 350--700 nm was observed from nanocrystals 2--5 nm in size. The 2.0 nm nanocrystals yielded the most intense PL (at 420 nm) which is believed to be intrinsic and attributed to direct recombination at {Gamma}. Excitation at high energy (250 nm) populates most of the conduction bands resulting in competing recombination channels and the observed broad PL spectra.

Physical Description

28 p.

Notes

OSTI as DE00755587

Medium: P; Size: 28 pages

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  • Journal Name: Physical Review BIS; Other Information: Submitted to Physical Review BIS

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  • Report No.: SAND2000-1099J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 755587
  • Archival Resource Key: ark:/67531/metadc702659

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  • May 1, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 10, 2017, 6:58 p.m.

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WILCOXON,JESS P.; PROVENCIO,PAULA P. & SAMARA,GEORGE A. Optical properties of colloidal germanium nanocrystals, article, May 1, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc702659/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.