Method of making a transistor having a source and a drain obtained by recrystallization of semiconductor
First Claim
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1. Method of making a transistor, comprising:
- forming a gate and a first dielectric spacer in contact with the side walls of the gate, on a first region of a first layer that will form the transistor channel, the first layer being a crystalline semiconducting layer;
forming first portions of crystalline semiconductor on second regions of the first layer that will form part of the transistor source and drain;
making at least the second regions of the first layer amorphous and doping them;
recrystallizing at least the semiconductor in the second regions of the first layer and activating the dopants present at least in the semiconductor of the second regions of the first layer;
removing the first portions;
forming a second dielectric spacer in contact with the lateral walls of the gate such that the thickness of the second dielectric spacer is more than the thickness of the first dielectric spacer;
forming second portions of doped crystalline semiconductor on the second regions of the first layer such that at least said second portions and the second regions of the first layer together form the source and drain of the transistor.
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Abstract
Method of making a transistor, comprising the following steps:
- make a gate and a first spacer on a first channel region of a first crystalline semiconducting layer;
- make first crystalline semiconductor portions on the second source and drain regions;
- make the second regions amorphous and dope them;
- recrystallise the second regions and activate the dopants present in the second regions;
- remove the first portions;
- make a second spacer thicker than the first spacer;
- make second doped crystalline semiconductor portions on the second regions, said second portions and the second regions of the first layer together form the source and drain of the transistor.
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Citations
15 Claims
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1. Method of making a transistor, comprising:
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forming a gate and a first dielectric spacer in contact with the side walls of the gate, on a first region of a first layer that will form the transistor channel, the first layer being a crystalline semiconducting layer; forming first portions of crystalline semiconductor on second regions of the first layer that will form part of the transistor source and drain; making at least the second regions of the first layer amorphous and doping them; recrystallizing at least the semiconductor in the second regions of the first layer and activating the dopants present at least in the semiconductor of the second regions of the first layer; removing the first portions; forming a second dielectric spacer in contact with the lateral walls of the gate such that the thickness of the second dielectric spacer is more than the thickness of the first dielectric spacer; forming second portions of doped crystalline semiconductor on the second regions of the first layer such that at least said second portions and the second regions of the first layer together form the source and drain of the transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification