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US 7,741,139 B2Granted
Solar cell manufacturing method
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorYoichiro Nishimoto
Life of this patent
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Abstract
A method of manufacturing a solar cell includes forming a diffusion layer on a crystal-type silicon substrate. The diffusion layer has a conductivity opposite to that of the substrate. Furthermore, the method includes etching and removing a part of the diffusion layer by using sodium silicate, and forming a first electrode that makes an electric contact with the diffusion layer and forming a second electrode that makes an electric contact with the substrate.
Claims29
A method of manufacturing a solar cell, comprising:
- forming a diffusion layer on a crystal-type silicon substrate to cover entirely surfaces of the substrate, the surfaces including a front surface, a back surface and edges of the substrate, wherein the diffusion layer has a conductivity opposite to that of the substrate;
- applying sodium silicate to a part of the diffusion layer that is located along a periphery of the back surface;
- etching and removing the part of the diffusion layer on which the sodium silicate is applied, while leaving the diffusion layer on the edges;
- removing the sodium silicate after the etching is performed;
- depositing an anti-reflection coating on the front surface;
- and
- forming a first electrode that makes an electric contact with the diffusion layer and forming a second electrode that makes an electric contact with the substrate, after depositing the anti-reflection coating.
4 more elements
A method of manufacturing a solar cell, comprising:
- forming a diffusion layer on a crystal-type silicon substrate, the diffusion layer having a conductivity opposite to that of the substrate;
- liquefying an etchant with an aqueous solution to a predetermined viscosity;
- applying the liquefied etchant to a part of the diffusion layer that is located along a periphery of the substrate;
- drying the applied etchant to evaporate the aqueous solution therefrom, to etch and remove the part of the diffusion layer on which the liquefied etchant was applied;
- and
- forming a first electrode that makes an electric contact with the diffusion layer and forming a second electrode that makes an electric contact with the substrate.
3 more elements
A method of manufacturing a solar cell, comprising:
- forming a diffusion layer on a crystal-type silicon substrate to cover entirely surfaces of the substrate, the surfaces including a back surface and edges of the substrate, wherein the diffusion layer has a conductivity opposite to that of the substrate;
- applying sodium silicate to a part of the diffusion layer that is located along a periphery of the back surface;
- etching and removing the part of the diffusion layer on which the sodium silicate is applied, while leaving the diffusion layer on the edges;
- and
- forming a first electrode that makes an electric contact with the diffusion layer and forming a second electrode that makes an electric contact with the substrate.
2 more elements
Dependencies are inferred from the claim text.