A V-shaped module technique for promoting generation photocurrent density of silicon solar cells

A V-shaped solar cell module consists of two tilted mono-crystalline cells [J. Li, China Patent No. 200410007708.6 (March, 2004)]. The angle included between the two tilted cells is 90 degrees. The two cells were fabricated by using polished silicon wafers. The scheme of both-side polished wafers has been proposed to reduce optical loss. Compared to solar cells in a planar way, the V-shaped structure enhances external quantum efficiency and leads to an increase of 15% in generation photocurrent density. The following three kinds of trapped photons are suggested to contribute to the increase: (1) infrared photons converted from visible photons due to a transformation mechanism, (2) photons reflected from top contact metal, and (3) a residual reflection which can not be eliminated by an antireflection coating.

A V-shaped solar cell module consists of two tilted mono-crystalline cells [J. Li, China Patent No. 200410007708.6 (March, 2004)]. The angle included between the two tilted cells is 90 degrees. The two cells were fabricated by using polished silicon wafers. The scheme of both-side polished wafers has been proposed to reduce optical loss. Compared to solar cells in a planar way, the V-shaped structure enhances external quantum efficiency and leads to an increase of 15% in generation photocurrent density. The following three kinds of trapped photons are suggested to contribute to the increase: (1) infrared photons converted from visible photons due to a transformation mechanism, (2) photons reflected from top contact metal, and (3) a residual reflection which can not be eliminated by an antireflection coating.

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Chinese Phys Soc.; Shanghai Phys Soc.; Natl Nat Sci Fdn China.; E China Normal Univ, Sch Informat Sci & Technol.; Fudan Univ, Appl Surface Phys Lab.; Natl Lab Infrared Phys.; CAS, Shanghai Inst Tech Phys.; E China Normal Univ, Key Lab Opt & Magnet Resonance Spectroscopy.

Chinese Acad Sci, Inst Semicond, Beijing 100083, Peoples R China

Chinese Phys Soc.; Shanghai Phys Soc.; Natl Nat Sci Fdn China.; E China Normal Univ, Sch Informat Sci & Technol.; Fudan Univ, Appl Surface Phys Lab.; Natl Lab Infrared Phys.; CAS, Shanghai Inst Tech Phys.; E China Normal Univ, Key Lab Opt & Magnet Resonance Spectroscopy.