Solar cell and its manufacturing method

Batteries: thermoelectric and photoelectric – Photoelectric

Reexamination Certificate

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Reexamination Certificate

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07355114

ABSTRACT:
An OECO solar cell using a semiconductor single crystal substrate having a plurality of grooves, wherein a minimum groove depth h of each groove always satisfies the relation of h≧W1tan θ where θ represents an angle between a line connecting the lower end, along the thickness-wise direction of the semiconductor single crystal substrate, of an electrode formed in the groove and the upper end of the inner side face of the same groove having no electrode formed thereon, and a reference line normal to the thickness-wise direction, and W1represents a distance between both opening edges of the groove; wherein the semiconductor single crystal substrate has thickness decreasing from a first side of a first main surface to a second side opposed to the first side; and wherein the plurality of grooves have a depth distribution of being deepest at a thickest position of the substrate, and a gradually becoming shallower towards a thinnest position of the substrate.

REFERENCES:
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patent: 5704992 (1998-01-01), Willeke et al.
patent: 6172297 (2001-01-01), Hezel et al.
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patent: 3-288476 (1991-12-01), None
patent: 2000-126934 (2000-05-01), None
Verbeek, Martin et al., “Mechanically Grooved High-Efficiency Silicon Solar Cells With Self-Aligned Metallisation,” Photovoltaic Specialists Conference, 1996, Conference Record of the Twenty-Fifth IEEE, May 13-17, 1996, pp. 521-524.
Hezel, R., et al., “A New Strategy for the Fabrication of Cost-Effective Silicon Solar Cells,”Renewable Energy, vol. 14, Nos. 1-4, May 1998, pp. 83-88.
Hezel, R., et al., “A New Strategy for the Fabrication of Cost-Effective Silicon Solar Cells,”Renewable Energy, May 1998, pp. 83-88, vol. 14, Nos. 1-4, Pergamon.

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