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Proceedings Paper

Silanization of plasma-grown silicon quantum dots for production of a tunable, stable, colloidal solution
Author(s): Ingrid E. Anderson; Rebecca A. Shircliff; Benjamin G. Lee; Brian Simonds; Sumit Agarwal; Paul Stradins; Reuben T. Collins
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Paper Abstract

Nanomaterials have the potential to revolutionize photovoltaics with the promise of new physics, novel architectures and low cost synthesis. Silicon quantum dots, relative to their II-VI counterparts, are understudied due to the difficulty of solution synthesis and chemical passivation. However, silicon is still an attractive solar cell material, providing an optimal band gap, low toxicity, and a very solid body of physical understanding of bulk silicon to draw from. We have synthesized silicon quantum dots with plasma enhanced chemical vapor deposition, and have developed a method for chemical passivation of these silicon quantum dots that can be used on particles created in a variety of ways. This versatile method utilizes oxidation via wet chemical etch and subsequent siloxane bond formation. The attachment of a silane to the SiOx shell leads to stability of the silicon core for over a month in air, and individual particles can be seen with TEM; thus a stable, colloidal suspension is formed. The future for this technique, including increasing quantum yield of the particles by changing the nature of the oxide, will be discussed.

Paper Details

Date Published: 6 September 2011
PDF: 7 pages
Proc. SPIE 8094, Nanophotonic Materials VIII, 809403 (6 September 2011); doi: 10.1117/12.892836
Show Author Affiliations
Ingrid E. Anderson, Colorado School of Mines (United States)
Rebecca A. Shircliff, Colorado School of Mines (United States)
Benjamin G. Lee, National Renewable Energy Lab. (United States)
Brian Simonds, Colorado School of Mines (United States)
Sumit Agarwal, Colorado School of Mines (United States)
Paul Stradins, National Renewable Energy Lab. (United States)
Reuben T. Collins, Colorado School of Mines (United States)

Published in SPIE Proceedings Vol. 8094:
Nanophotonic Materials VIII
Stefano Cabrini; Taleb Mokari, Editor(s)

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