Abstract
Hydrogenated microcrystalline silicon (μc-Si:H) solar cells show decreasing open-circuit voltage with increasing crystalline volume fraction ( F c ). Therefore, most research groups focus on μc-Si:H films produced close to the transition with amorphous silicon. Three cells with varying F c and large-grain fraction, F lg have been studied experimentally and by modeling. The large grained fluorinated μc-Si:H cell appears to be an exception to the above rule, and modeling is used to understand why low and high F c μc-Si:H and μc-Si:F:H are used as the second intrinsic-layer in hypothetical double junction cells. Modeling suggests possible efficiencies of 11.3%, 8.4% and 13%, respectively. Three methods of double junction cell thickness optimization are discussed.
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