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Si-H bond dynamics in hydrogenated amorphous silicon

Si-H bond dynamics in hydrogenated amorphous silicon The ultrafast structural dynamics of the Si-H bond in the rigid solvent environment of an amorphous silicon thin film is investigated using two-dimensional infrared four-wave mixing techniques. The two-dimensional infrared (2DIR) vibrational correlation spectrum resolves the homogeneous line shapes ( < 2.5 cm − 1 linewidth) of the 0 → 1 and 1 → 2 vibrational transitions within the extensively inhomogeneously broadened ( 78 cm − 1 linewidth) Si-H vibrational band. There is no spectral diffusion evident in correlation spectra obtained at 0.2, 1, and 4 ps waiting times. The Si-H stretching mode anharmonic shift is determined to be 84 cm − 1 and decreases slightly with vibrational frequency. The 1 → 2 linewidth increases with vibrational frequency. Frequency dependent vibrational population times measured by transient grating spectroscopy are also reported. The narrow homogeneous line shape, large inhomogeneous broadening, and lack of spectral diffusion reported here present the ideal backdrop for using a 2DIR probe following electronic pumping to measure the transient structural dynamics implicated in the Staebler-Wronski degradation Appl. Phys. Lett. 31 , 292 ( 1977 ) in a - Si : H based solar cells. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Si-H bond dynamics in hydrogenated amorphous silicon

Physical Review B , Volume 76 (5) – Aug 1, 2007
9 pages

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References (53)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2007 The American Physical Society
ISSN
1550-235X
DOI
10.1103/PhysRevB.76.054301
Publisher site
See Article on Publisher Site

Abstract

The ultrafast structural dynamics of the Si-H bond in the rigid solvent environment of an amorphous silicon thin film is investigated using two-dimensional infrared four-wave mixing techniques. The two-dimensional infrared (2DIR) vibrational correlation spectrum resolves the homogeneous line shapes ( < 2.5 cm − 1 linewidth) of the 0 → 1 and 1 → 2 vibrational transitions within the extensively inhomogeneously broadened ( 78 cm − 1 linewidth) Si-H vibrational band. There is no spectral diffusion evident in correlation spectra obtained at 0.2, 1, and 4 ps waiting times. The Si-H stretching mode anharmonic shift is determined to be 84 cm − 1 and decreases slightly with vibrational frequency. The 1 → 2 linewidth increases with vibrational frequency. Frequency dependent vibrational population times measured by transient grating spectroscopy are also reported. The narrow homogeneous line shape, large inhomogeneous broadening, and lack of spectral diffusion reported here present the ideal backdrop for using a 2DIR probe following electronic pumping to measure the transient structural dynamics implicated in the Staebler-Wronski degradation Appl. Phys. Lett. 31 , 292 ( 1977 ) in a - Si : H based solar cells.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Aug 1, 2007

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