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Solid state image pick-up device for imaging an object placed thereon

  • US 8,233,063 B2
  • Filed: 11/07/2005
  • Issued: 07/31/2012
  • Est. Priority Date: 07/17/2000
  • Status: Expired due to Term
First Claim
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1. A solid-state image pickup device comprising:

  • a semiconductor substrate having a front surface and a rear surface;

    a photo detective layer formed in said semiconductor substrate at a side of said front surface and detecting a light entering through said rear surface, said photo detective layer having;

    a first region having a first conductive type;

    a plurality of second regions having a second conductive type opposite to said first conductive type, each of said second regions constituting a photo diode and being separated from each other by said first region;

    said plurality of second regions having a top surface that is positioned at a side of said front surface and a bottom surface that is positioned at a side of said rear surface; and

    a third region contacting said bottom surface of one of said second regions and having said first conductive type, said third region being lower in impurity density than said first region.

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