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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

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On the lack of observable light-induced hydrogen diffusion near room temperature

Branz, H. M. and Bullock, J. N. and Asher, S. and Gleskova, Helena and Wagner, S. (1996) On the lack of observable light-induced hydrogen diffusion near room temperature. Journal of Non-Crystalline Solids, 198-200. pp. 441-444. ISSN 0022-3093

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Abstract

A 5-day, high-intensity (9 W cm−2), red-light soak of a-Si:H at 65°C yields no detectable H diffusion in a tracer experiment. A new upper bound to the light-induced diffusion coefficient at a temperature so low that thermal diffusion is negligible is found. The null result found here is incompatible with models in which H emission from SiH bonds is proportional at all times to both the light intensity and the metastable defect creation rate. However, this result is compatible with the model proposed by Santos et al. in which both H emission and metastable defect creation are proportional to the product of the free electron and hole densities. In this model, this result implies that fewer than 500 H emissions occur per created metastable defect.