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Local and Long-Range Hydrogen Motion in a-Si:H

Published online by Cambridge University Press:  15 February 2011

P. Hari ,
P. C. Taylor  and
R. A. Street
P. Hari
Affiliation:
Department of Physics, University of Utah, Salt Lake City, UT 84112
P. C. Taylor
Affiliation:
Department of Physics, University of Utah, Salt Lake City, UT 84112
R. A. Street
Affiliation:
Department of Physics, University of Utah, Salt Lake City, UT 84112
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Abstract

Nuclear magnetic resonance (NMR) measurements of 1H dipolar echoes in a-Si:H indicate that the dipolar spin-lattice relaxation time, T1D, can be used as a measure of local hydrogen motion. In general, the microscopic hydrogen motion is orders of magnitude faster, and the microscopic activation energies are much smaller, than those measured macroscopically using secondary ion mass spectroscopy (SIMS). Although no detailed model exists to explain these apparently divergent results, these discrepancies can be understood phenomenologically by assuming a very broad distribution of rates. In this case the measured activation energies can be shown to scale roughly as the logarithm of the time over which the measurement is made.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 377: Symposium A – Amorphous Silicon Technology 1995 , 1995 , 185
Copyright
Copyright © Materials Research Society 1995

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References

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