SOI CMOS device with reduced DIBL
First Claim
1. A semiconductor transistor device comprising:
- a semiconductive substrate;
an insulative layer buried within the semiconductive substrate;
an active layer of semiconductive material above the insulative layer;
a plurality of doped device regions in the active layer;
a gate structure formed on the device regions;
source and drain regions formed in the device regions such that the doping type for the source and drain is complementary to the doping type of the corresponding device region; and
dopant diffusion sources placed within the buried insulator layer underlying the device regions wherein the dopant diffusion sources diffuse into the device regions so as to create a retrograde dopant profile in the device regions.
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Abstract
A CMOS device formed with a Silicon On Insulator (SOI) technology with reduced Drain Induced Barrier Lowering (DIBL) characteristics and a method for producing the same. The method involves a high energy, high dose implant of boron and phosphorus through the p- and n-wells, into the insulator layer, thereby creating a borophosphosilicate glass (BPSG) structure within the insulation layer underlying the p- and n-wells of the SOI wafer. Backend high temperature processing steps induce diffusion of the boron and phosphorus contained in the BPSG into the p- and n-wells, thereby forming a retrograde dopant profile in the wells. The retrograde dopant profile reduces DIBL and also provides recombination centers adjacent the insulator layer and the active layer to thereby reduce floating body effects for the CMOS device.
38 Citations
14 Claims
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1. A semiconductor transistor device comprising:
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a semiconductive substrate;
an insulative layer buried within the semiconductive substrate;
an active layer of semiconductive material above the insulative layer;
a plurality of doped device regions in the active layer;
a gate structure formed on the device regions;
source and drain regions formed in the device regions such that the doping type for the source and drain is complementary to the doping type of the corresponding device region; and
dopant diffusion sources placed within the buried insulator layer underlying the device regions wherein the dopant diffusion sources diffuse into the device regions so as to create a retrograde dopant profile in the device regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification