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Method for forming a thin film transistor

  • US 5,834,071 A
  • Filed: 02/11/1997
  • Issued: 11/10/1998
  • Est. Priority Date: 02/11/1997
  • Status: Expired due to Term
First Claim
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1. Method for forming a polycrystalline silicon (ploy-Si) film of a semiconductor device, said method comprising:

  • forming a conductive layer on a substrate;

    forming a dielectric layer on said substrate and said conductive layer;

    forming a first layer on said dielectric layer;

    forming a second layer on said first layer;

    patterning a photoresist layer on said second layer;

    defining a plurality of doped regions in said first layer and said second layer;

    annealing said first layer and said second layer by a laser, thereby said first layer and said second layer are transformed to a polycrystalline silicon (poly-Si) layer;

    patterning a channel region by etching portions of said poly-Si layer;

    defining source and drain region in said poly-Si layer;

    forming a source electrode and a drain electrode of said semiconductor device; and

    forming a passivation layer on said source electrode, said drain electrode, said channel region and said dielectric layer.

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