Solar cell
First Claim
1. A solar cell comprisinga substrate layer of semiconductor material, in which energy from a radiation source generates minority and majority charge carriers, the substrate layer having a first surface adapted to face toward said radiation source and a second surface adapted to face away from said radiation source;
- a plurality of spaced apart ohmic contacts electrically coupled to one another and positioned directly on the first surface for collecting majority carriers;
a passivation layer covering the ohmic contacts and the spaces therebetween; and
means for providing an electrical field separating the minority and majority charge carriers in the region of the second surface, so that the majority charge carriers diffuse to the ohmic contacts and are collected by them.
2 Assignments
0 Petitions
Accused Products
Abstract
A solar cell (10), preferably of silicon, having a semiconductive substrate (1) on one side of which an electrical field is provided by, for example, an MIS contact (1, 2, 3) to cause a separation of charge carriers generated by light energy. The minority charge carriers are drawn into the metal (3) of the MIS contact, whereas the majority charge carriers are discharged via ohmic contact zones (4) arranged on the opposite side of the semiconductive substrate. At least one passivation layer (5) is arranged on the semiconductive substrate between the ohmic contact zones, whereby the recombination velocity of the charge carriers in the area of the ohmic contact zones is considerably reduced.
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Citations
31 Claims
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1. A solar cell comprising
a substrate layer of semiconductor material, in which energy from a radiation source generates minority and majority charge carriers, the substrate layer having a first surface adapted to face toward said radiation source and a second surface adapted to face away from said radiation source; -
a plurality of spaced apart ohmic contacts electrically coupled to one another and positioned directly on the first surface for collecting majority carriers; a passivation layer covering the ohmic contacts and the spaces therebetween; and means for providing an electrical field separating the minority and majority charge carriers in the region of the second surface, so that the majority charge carriers diffuse to the ohmic contacts and are collected by them. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A solar cell comprising:
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a substrate layer of semiconductor material, in which energy from a radiation source generates minority and majority charge carriers, the substrate layer having a first surface facing a front surface of the cell and a second surface facing a rear surface of the cell; a first passivation layer in the form of an insulating layer formed on said first substrate surface; metal insulator semiconductor contacts formed on said first passivation layer for collecting minority carriers; ohmic contacts formed directly on said second substrates surface for collecting majority carriers, the ohmic contacts covering less than 20% of the surface area of said second substrate surface, the distance between ohmic contacts being greater than the diffusion length of the minority charge carriers, and greater than the thickness of the substrate layer; and a second passivation layer covering the ohmic contacts and the spaces therebetween; an electrically charged insulating layer formed over said metal insulator semiconductor contacts and said first passivation layer at least in the areas between said metal insulator semiconductor contacts. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification