Y. Hishikawa, T. Kinoshita, M. Shima, M. Tanaka, S. Kiyama, S. Tsuda, S. Nakano
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Optical confinement and optical loss in high-efficiency a-Si solar cells
The world's highest stabilized conversion efficiency of 9.5% has been achieved for a 30/spl times/40 cm/sup 2/ a-Si/a-SiGe glass superstrate solar cell submodule. However, significant optical loss still exists even in these high-efficiency a-Si solar cells. FEM numerical simulation has shown that the primary origin of the optical loss in textured a-Si solar cells at about /spl ges/800 nm is absorption in SnO/sub 2/ which is enhanced by the optical confinement effect. Optical confinement also results in increased absorption in the metal electrode, which is another source of optical loss.
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