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Solar cell substrate, thin-film solar cell, and multi-junction thin-film solar cell
Solar cell substrate, thin-film solar cell, and multi-junction thin-film solar cell
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机译：太阳能电池基板，薄膜太阳能电池和多结薄膜太阳能电池
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摘要
A solar cell substrate of the present invention has irregularities on a surface which is in contact with a photo-electric conversion layer, and light is incident on the side of the irregularities. The height of the irregularities is set so that the root mean square height is in a range of 15 nm to 600 nm, and tan is in a range of 0.10 to 0.30, where is the angle of incline of the surface of the irregularities with respect to an average line of the irregularities. According to this arrangement, the light incident on the irregularities is scattered at the interface. This increases the optical path length and thus the quantity of light absorbed in the photo-electric conversion layer. As a result, photo-electric conversion efficiency can be improved and the photo-electric conversion layer can be made thinner, thereby greatly reducing deposit time and manufacturing cost required for the photo-electric conversion layer. Further, by the foregoing ranges of the height of the irregularities, and tan , it is ensured that collision of crystals is not incurred. It is therefore possible to surely prevent deterioration of photo-electric conversion efficiency which is caused by defects.
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