Solar cell
First Claim
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1. A solar cell comprising:
- a semiconductive substrate having first and second opposed major surfaces in which minority and majority charge carriers are generated by radiation energy, said charge carriers being separable and so dischargeable by an electrical field,ohmic contacts arranged at intervals upon said first semiconductive substrate surface, said contacts being interlinked with one another, anda passivation layer arranged at least between said ohmic contacts, and whereinthe electrical field separating the minority and majority charge carriers exists in the vicinity of said second semiconductive substrate surface positioned opposite said first semiconductive surface carrying said ohmic contacts, so that the majority charge carriers diffuse to said ohmic contacts which collect said charge carriers,said ohmic contacts are arranged in first areas on said first semiconductive substrate surface, said first areas being elevated with respect to second areas which are located between said ohmic contacts,said ohmic contacts are in direct contact with said semiconductive substrate without shielding means, provided by doping said semiconductor substrate in its first surface region, for shielding against the minority charge carriers by a potential barrier,said second areas do not have a potential barrier against minority charge carriers provided by doping of said semiconductor substrate in its first surface region, andsaid ohmic contacts are covered by the passivation layer.
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Abstract
Proposed is a silicon solar cell with a substrate body on one side of which an electrical field is generated by an MIS contact to cause separation of charge carriers generated by radiation energy. The minority charge carriers are drawn off in the metal of the MIS contact, whereas the majority charge carriers are conducted away by ohmic contacts arranged on the opposite side. The ohmic contacts are located on elevated areas relative to the substrate surface. Moreover, the side of the substrate body bearing the ohmic contacts is completely covered with at least one passivation layer.
44 Citations
27 Claims
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1. A solar cell comprising:
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a semiconductive substrate having first and second opposed major surfaces in which minority and majority charge carriers are generated by radiation energy, said charge carriers being separable and so dischargeable by an electrical field, ohmic contacts arranged at intervals upon said first semiconductive substrate surface, said contacts being interlinked with one another, and a passivation layer arranged at least between said ohmic contacts, and wherein the electrical field separating the minority and majority charge carriers exists in the vicinity of said second semiconductive substrate surface positioned opposite said first semiconductive surface carrying said ohmic contacts, so that the majority charge carriers diffuse to said ohmic contacts which collect said charge carriers, said ohmic contacts are arranged in first areas on said first semiconductive substrate surface, said first areas being elevated with respect to second areas which are located between said ohmic contacts, said ohmic contacts are in direct contact with said semiconductive substrate without shielding means, provided by doping said semiconductor substrate in its first surface region, for shielding against the minority charge carriers by a potential barrier, said second areas do not have a potential barrier against minority charge carriers provided by doping of said semiconductor substrate in its first surface region, and said ohmic contacts are covered by the passivation layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A solar cell comprising:
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a semiconductive substrate having first and second opposed major surfaces in which minority and majority charge carriers are generated by radiation energy, said charge carriers being separable and so dischargeable by an electrical field, ohmic contacts arranged at intervals upon said first semiconductive substrate surface, said contacts being interlinked with one another, and a passivation layer arranged at least between said ohmic contacts, and wherein the electrical field separating the minority and majority charge carriers exists in the vicinity of said second semiconductive substrate surface positioned opposite said first semiconductive surface carrying said ohmic contacts so that the majority charge carriers diffuse to said ohmic contacts which collect said charge carriers, and said ohmic contacts are arranged in first areas on said first semiconductive substrate surface, said first areas being elevated with respect to second areas which are located between said ohmic contacts. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification