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Power MOSFET and method for forming same using a self-aligned body implant

  • US 7,501,323 B2
  • Filed: 04/12/2005
  • Issued: 03/10/2009
  • Est. Priority Date: 07/20/2000
  • Status: Expired due to Fees
First Claim
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1. A method for making a MOSFET comprising:

  • forming a trench in a semiconductor layer;

    forming a gate dielectric layer lining the trench;

    forming a gate conducting layer in a lower portion of the trench;

    forming a dielectric layer to fill an upper portion of the trench;

    removing portions of the semiconductor layer laterally adjacent the dielectric layer so that an upper portion thereof extends outwardly from the semiconductor layer;

    forming source regions in the semiconductor layer adjacent the outwardly extending dielectric layer;

    forming spacers laterally adjacent the outwardly extending upper portion of the dielectric layer after forming the source regions;

    using the spacers as a self-aligned mask for forming source/body contact regions in the semiconductor layer so that the source/body contacts regions are below the source regions;

    forming a source electrode on the source regions and on the dielectric layer; and

    forming at least one conductive via between the source electrode and the source/body contact regions.

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