Bifacial a-Si:H solar cells: Origin of the asymmetry between front and back illumination
نویسندگان
چکیده
The asymmetry in performance between front and back illumination of a single-junction bifacial hydrogenated amorphous silicon (a-Si:H) cell is analyzed by numerical simulation using the ASA software and compared to experimental results. It is found that the difference between the band mobility of electron and the one of holes, and especially the difference in the band tail characteristic energy values are responsible for the asymmetry. The latter is characterized by a reduction in the cell current and FF for an illumination through the n-layer. The magnitude of this reduction, due to a deficient collection of holes, increases with increasing cell thickness.
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