On the Lack of Observable Light-Induced H Diffusion Near Room Temperature

    Research output: Contribution to journalArticle


    A 5-day, high-intensity, red-light soak of a-Si:H at 65 deg. 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 intensityand 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.
    Original languageAmerican English
    Pages (from-to)441-444
    Number of pages4
    JournalJournal of Non-Crystalline Solids
    Issue number1-3
    StatePublished - 1996

    NREL Publication Number

    • NREL/JA-21735


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