Inverse-T tungsten gate apparatus
First Claim
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1. A semiconductor device, said semiconductor device comprising:
- a semiconductor substrate having an overlying gate insulating layer;
a first silicided layer overlying said gate insulating layer wherein said first silicided layer is substantially non-reactive to said gate insulating layer; and
a gate electrode overlying said first silicided layer, said first silicided layer extending laterally from said gate electrode.
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Abstract
A technique for fabricating an integrated circuit device 100 using an inverse-T tungsten gate structure 121 overlying a silicided layer 119 is provided. This technique uses steps of forming a high quality gate oxide layer 115 overlying a semiconductor substrate 111. The silicided layer 119 is defined overlying the gate oxide layer 115. The silicided layer 119 does not substantially react to this layer. The technique defines the inverse-T tungsten gate electrode layer 121 overlying the silicided layer 119. A top surface of this gate electrode may also be silicided 127 to further reduce the resistance of this device element.
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Citations
17 Claims
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1. A semiconductor device, said semiconductor device comprising:
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a semiconductor substrate having an overlying gate insulating layer; a first silicided layer overlying said gate insulating layer wherein said first silicided layer is substantially non-reactive to said gate insulating layer; and a gate electrode overlying said first silicided layer, said first silicided layer extending laterally from said gate electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A semiconductor device, said semiconductor device comprising:
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a semiconductor substrate a gate insulating layer overlying said semiconductor substrate; a first silicided layer overlying said gate insulating layer wherein said first silicided layer is substantially non-reactive to said gate insulating layer; a gate electrode overlying said first silicided layer, said first silicided layer extending laterally from said gate electrode; a lightly-doped drain region in the semiconductor substrate adjacent to the gate electrode; a sidewall spacer adjacent to the gate electrode; and a source/drain region in the lightly-doped drain region adjacent to said sidewall spacer. - View Dependent Claims (14, 15, 16)
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17. A semiconductor device, said semiconductor device comprising:
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a semiconductor substrate having an overlying gate insulating layer; a first silicided layer overlying said gate insulating layer; and a gate electrode overlying said first silicided layer, said first silicided layer extending laterally from said gate electrode wherein the length ratio between the first silicided layer and the gate electrode is about 5;
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Specification