Process for making thin film silicon-on-insulator wafers employing wafer bonding and wafer thinning
First Claim
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1. A method for making SOI devices comprising the steps of(a) forming a first oxide layer on a first silicon wafer;
- (b) implanting boron ions into a surface layer of a second silicon wafer;
(c) bonding said surface layer to said oxide layer;
(d) etching said second silicon wafer to said boron implanted layer;
(e) growing a second thin oxide layer on the surface of said second silicon wafer; and
(f) annealing said layers in a hydrogen atmosphere to drive said boron ions into said first oxide layer, thereby reducing the boron doping concentration in said surface layer.
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Abstract
A very thin silicon film SOI device can be made utilizing a bond and etch-back process. In the presently claimed invention, boron dopant is introduced into a surface of a silicon device wafer and the doped surface is bonded onto another silicon wafer at an oxide surface. The device wafer is thinned by etching down to the doped region and, by subsequent annealing in hydrogen, boron is diffused out of the silicon surface layer to produce very thin SOI films.
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8 Claims
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1. A method for making SOI devices comprising the steps of
(a) forming a first oxide layer on a first silicon wafer; -
(b) implanting boron ions into a surface layer of a second silicon wafer; (c) bonding said surface layer to said oxide layer; (d) etching said second silicon wafer to said boron implanted layer; (e) growing a second thin oxide layer on the surface of said second silicon wafer; and (f) annealing said layers in a hydrogen atmosphere to drive said boron ions into said first oxide layer, thereby reducing the boron doping concentration in said surface layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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