H NMR Evidence for a Change in The Local Hydrogen Environment of Sites Associated with the Staebler-Wronski Effect in a-Si:H
Keyword(s):
H Nmr
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AbstractWe study the H NMR line shapes of a sample of a-Si:H under several conditions: 1) as grown, 2) light-soaked for 600 hours, and 3) light-soaked followed by annealing at different temperatures. At T = 7 K, the NMR line shape of the sample after light soaking exhibits an additional doublet compared to that of the sample as-grown. This doublet is an indication of a closely separated hydrogen pair. The distance between the two hydrogen atoms is estimated to be about (2.3 ± 0.2) Å. The concentration of these hydrogen sites is estimated to be between 1017 and 1018 cm-3 consistent with ESR measurements of the defect density after light soaking. This doublet disappears after the sample is annealed at 200°C for 4 hours.
2004 ◽
Vol 76
(1)
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pp. 147-155
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2012 ◽
Vol 370
(1968)
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pp. 2495-2508
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1984 ◽
Vol 62
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pp. 178-184
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2016 ◽
Vol 20
(08n11)
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pp. 1224-1232
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2002 ◽
Vol 09
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pp. 1209-1212
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