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Semiconductor device

  • US 8,872,179 B2
  • Filed: 11/28/2012
  • Issued: 10/28/2014
  • Est. Priority Date: 11/30/2011
  • Status: Active Grant
First Claim
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1. A semiconductor device comprising:

  • a gate over a substrate;

    a gate insulating layer over the gate;

    an oxide semiconductor layer comprising a first portion and a second portion, over the gate insulating layer, wherein the first portion is an end portion, and wherein the second portion is a portion except the end portion; and

    a first conductive layer and a second conductive layer over the oxide semiconductor layer,wherein the first conductive layer and the second conductive layer are not in contact with the first portion and are in contact with the second portion,wherein a concentration of a resistance-reducing element of the second portion is lower than a concentration of the resistance-reducing element of the first portion, andwherein a concentration of oxygen of the second portion is higher than a concentration of oxygen of the first portion.

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