Solar cell and method for manufacturing the same

  • US 9,508,875 B2
  • Filed: 05/22/2015
  • Issued: 11/29/2016
  • Est. Priority Date: 09/07/2009
  • Status: Active Grant
First Claim
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1. A solar cell, comprising:

  • a substrate including first impurities of a first conductive type;

    a first passivation layer that is positioned on an incident surface of the substrate;

    a first field region positioned on the incident surface of the substrate, and contains second impurities of a first conductive type;

    an anti-reflection layer positioned on the first field region;

    an emitter region that contains third impurities of a second conductive type opposite the first conductive type, and is positioned on a non-incident surface of the substrate opposite the incident surface of the substrate;

    a second passivation layer directly positioned on the non-incident surface of the substrate;

    a second field region that is positioned at the non-incident surface of the substrate, wherein the second field region has the same conductive type as the first field region;

    a spacing between the emitter region and the second field region to physically separate the emitter region and the second field region;

    a first electrode directly formed on the emitter region; and

    a second electrode directly formed on the second field region,wherein the second passivation layer comprises a first portion and a second portion, and the first portion is only positioned between the emitter region and the substrate and between the second field region and the substrate, and the second portion is only positioned on the substrate in the spacing,wherein the first portion only positioned between the emitter region and the substrate is physically separated from the first portion only positioned between the second field region and the substrate, andwherein a thickness of the first portion is different from a thickness of the second portion.

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