Kinetics of visible light photo-oxidation of Ge nanocrystals: Theory and in situ measurement

I. D. Sharp; Q. Xu; C. W. Yuan; J. W. Beeman; J. W. Ager; D. C. Chrzan; E. E. Haller

doi:10.1063/1.2724923

Kinetics of visible light photo-oxidation of Ge nanocrystals: Theory and in situ measurement

I. D. Sharp
, Q. Xu
, C. W. Yuan
, J. W. Beeman
, J. W. Ager
, D. C. Chrzan
, E. E. Haller

Chair of Experimental Semiconductor Physics (2017 — 2024)

Lawrence Berkeley National Laboratory
Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Photo-oxidation of Ge nanocrystals illuminated with visible laser light under ambient conditions was investigated. The photo-oxidation kinetics were monitored by in situ measurement of the crystalline Ge volume fraction by Raman spectroscopy. The effects of laser power and energy on the extent of oxidation were measured using both in situ and ex situ Raman scattering techniques. A mechanistic model in which the tunneling of photoexcited carriers to the oxide surface for electron activated molecular oxygen dissociation is proposed. This quantitative model describes all experimental photo-oxidation observations using physical parameters.

Original language	English
Article number	163118
Journal	Applied Physics Letters
Volume	90
Issue number	16
DOIs	https://doi.org/10.1063/1.2724923
State	Published - 2007

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title = "Kinetics of visible light photo-oxidation of Ge nanocrystals: Theory and in situ measurement",

abstract = "Photo-oxidation of Ge nanocrystals illuminated with visible laser light under ambient conditions was investigated. The photo-oxidation kinetics were monitored by in situ measurement of the crystalline Ge volume fraction by Raman spectroscopy. The effects of laser power and energy on the extent of oxidation were measured using both in situ and ex situ Raman scattering techniques. A mechanistic model in which the tunneling of photoexcited carriers to the oxide surface for electron activated molecular oxygen dissociation is proposed. This quantitative model describes all experimental photo-oxidation observations using physical parameters.",

author = "Sharp, \{I. D.\} and Q. Xu and Yuan, \{C. W.\} and Beeman, \{J. W.\} and Ager, \{J. W.\} and Chrzan, \{D. C.\} and Haller, \{E. E.\}",

note = "Funding Information: The authors would like to thank K. M. Yu for his input. Two of the authors (D.C.C. and E.E.H.) acknowledge support from the Miller Institute for Basic Research in Science. This work is supported in part by the Director, Office of Science, Office of Basic Energy Sciences, Division of Materials Science and Engineering, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 and in part by U.S. NSF Grant No. DMR-0405472.",

year = "2007",

doi = "10.1063/1.2724923",

language = "English",

volume = "90",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "16",

}

TY - JOUR

T1 - Kinetics of visible light photo-oxidation of Ge nanocrystals

T2 - Theory and in situ measurement

AU - Sharp, I. D.

AU - Xu, Q.

AU - Yuan, C. W.

AU - Beeman, J. W.

AU - Ager, J. W.

AU - Chrzan, D. C.

AU - Haller, E. E.

N1 - Funding Information: The authors would like to thank K. M. Yu for his input. Two of the authors (D.C.C. and E.E.H.) acknowledge support from the Miller Institute for Basic Research in Science. This work is supported in part by the Director, Office of Science, Office of Basic Energy Sciences, Division of Materials Science and Engineering, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 and in part by U.S. NSF Grant No. DMR-0405472.

PY - 2007

Y1 - 2007

N2 - Photo-oxidation of Ge nanocrystals illuminated with visible laser light under ambient conditions was investigated. The photo-oxidation kinetics were monitored by in situ measurement of the crystalline Ge volume fraction by Raman spectroscopy. The effects of laser power and energy on the extent of oxidation were measured using both in situ and ex situ Raman scattering techniques. A mechanistic model in which the tunneling of photoexcited carriers to the oxide surface for electron activated molecular oxygen dissociation is proposed. This quantitative model describes all experimental photo-oxidation observations using physical parameters.

AB - Photo-oxidation of Ge nanocrystals illuminated with visible laser light under ambient conditions was investigated. The photo-oxidation kinetics were monitored by in situ measurement of the crystalline Ge volume fraction by Raman spectroscopy. The effects of laser power and energy on the extent of oxidation were measured using both in situ and ex situ Raman scattering techniques. A mechanistic model in which the tunneling of photoexcited carriers to the oxide surface for electron activated molecular oxygen dissociation is proposed. This quantitative model describes all experimental photo-oxidation observations using physical parameters.

UR - https://www.scopus.com/pages/publications/34247345378

U2 - 10.1063/1.2724923

DO - 10.1063/1.2724923

M3 - Article

AN - SCOPUS:34247345378

SN - 0003-6951

VL - 90

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 16

M1 - 163118

ER -

Kinetics of visible light photo-oxidation of Ge nanocrystals: Theory and in situ measurement

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