Abstract
The Staebler-Wronski effect (SWE) is examined as a function of hydrogen content (C/sub H/) and the local H bond structure. The SWE is examined through the rate of degradation of solar cells due to light exposure (at room temperature) and the steady-state defect density that can be established through high-temperature (T>150 degrees C) degradation. Structure and C/sub H/ are carefully controlled by the photo-CVD (chemical vapor deposition) reactor conditions. Growth conditions for altering C/sub H/ with a minimum of other changes are identified. Films with a total C/sub H/ of 7 and 11% were grown at the same substrate temperature and characterized. The initial density of defects in both materials was low ( approximately 2E15/cm/sup 2/-eV) but the stability was drastically reduced in the high-C/sub H/ films and devices. The change in stability due to increased C/sub H/ is consistent with the SW precursor being a hydrogen-rich region. >
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