Abstract
Staebler-Wronski effect (SWE) is investigated under external strain, applied by bending thin glass substrate. Strong enhancement of increase of subgap optical absorption below 1.4 eV is observed when light soaking is done under high external strain. No general correlation in change of subgap absorption and change in mobility-lifetime product is found. Results are interpreted in terms of two mechanisms of SWE: rise in dangling bond density and change in a charge state of defects. This second mechanism is explained by breaking of impurity-dangling bond intimate pairs.
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