Solar cell
AssigneeSanyo Electric Co., Ltd.
InventorsToshio Asaumi, Hitoshi Sakata
Life of this patent
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Abstract
A solar cell, wherein contamination with an undesired impurity is suppressed, and solar cell characteristics are excellent. This solar cell is provided with: a semiconductor substrate having a photoreceiving surface and a back surface; a first semiconductor layer of a first conductivity type formed on a prescribed region of the back surface of the semiconductor substrate; a second semiconductor layer of a second conductivity type formed to extend over the back surface of the semiconductor substrate and the surface of the first semiconductor layer; and a cap layer formed between the first semiconductor layer and the second semiconductor layer, and containing no impurity of the first conductivity type.
Claims20
A solar cell comprising:
- a semiconductor substrate having a photo receiving surface and a back surface;
- a first semiconductor layer of a first conductivity type formed on a prescribed region of the back surface of said semiconductor substrate;
- a second semiconductor layer of a second conductivity type formed to extend over the back surface of said semiconductor substrate and the surface of said first semiconductor layer;
- and
- a cap layer, formed between said first semiconductor layer and said second semiconductor layer, made of a semiconductor or an insulator substantially containing no impurity of said first conductivity type,
- wherein the solar cell further comprises a p-side electrode and an n-side electrode directly formed on the back surface of said second semiconductor layer.
Dependencies are inferred from the claim text.