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A concept to increase the output voltage of solar cells using monolithically series-interconnected thin-film Si solar cells on SOI-wafers is presented. By using this concept 10 or 20 single cells (active areas: 0.4 cm/sup 2/ or 0.2 cm/sup 2/) have been processed on mono-x-Si SOI-wafers with a 15 /spl mu/m thick device layer. Two different kinds of SOI-material [/spl rho//sub p(Si active)/=(2...3)...
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