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Solar cell

  • US 4,900,369 A
  • Filed: 12/14/1988
  • Issued: 02/13/1990
  • Est. Priority Date: 10/11/1985
  • Status: Expired due to Fees
First Claim
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1. A solar cell comprising:

  • a substrate layer of semiconductor material of a first conductivity type, in which energy from a radiation source generates minority and majority charge carriers, the substrate layer having a first surface facing the front of the cell and a second surface facing the rear of said cell;

    a highly doped semiconductor layer of second conductivity type formed on said first surface of said substrate layer, said second conductivity type being opposite to said first conductively type;

    a plurality of spaced first ohmic contacts formed on said highly doped layer;

    a plurality of spaced second ohmic contacts formed directly on said second surface of said substrate layer,an insulation, passivation, and antireflection layer formed over and between said second ohmic contacts,said highly doped semiconductor layer of second conductivity type forming junction means for providing an electrical field for separating the minority and majority charge carriers in the region of the first surface of said substrate layer so that the majority charge carriers diffuse to said second ohmic contacts and are collected by them, the thickness of said substrate layer being less than or equal to the diffusion length of the minority charge carriers in said substrate layer.

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