Inverted dielectric isolation process
First Claim
1. A method of fabricating a circuit on a substrate, the method comprising:
- doping a plurality of active regions of a device on the first side of the substrate;
forming insulated interconnects interconnecting the active regions of the device on the first side of the substrate;
forming a dielectric layer on the first side of the substrate overlying the insulated interconnects of the device;
bonding a support to the first side of the substrate overlying the dielectric layer thereby forming a composite structure;
removing a portion of the substrate on a second side of the substrate opposite the first side of the substrate so that only active regions of the device remain;
doping second-side regions of the device into the second side of the substrate; and
forming a second-side conductor on the second side of the substrate.
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Abstract
A method of semiconductor fabrication includes the steps of forming a dielectric layer on a first surface of a semiconductor wafer having a plurality of laterally distributed semiconductor devices selectively interconnected on the first surface and bonding a support substrate to the first surface of the semiconductor wafer on the dielectric layer to form a composite structure. A portion of the semiconductor wafer from a second surface which is opposite the first surface is removed and the second surface of the semiconductor wafer is processed. Processing of the second surface optionally includes the formation of isolation trenches electrically isolating the laterally distributed semiconductor devices.
113 Citations
20 Claims
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1. A method of fabricating a circuit on a substrate, the method comprising:
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doping a plurality of active regions of a device on the first side of the substrate; forming insulated interconnects interconnecting the active regions of the device on the first side of the substrate; forming a dielectric layer on the first side of the substrate overlying the insulated interconnects of the device; bonding a support to the first side of the substrate overlying the dielectric layer thereby forming a composite structure; removing a portion of the substrate on a second side of the substrate opposite the first side of the substrate so that only active regions of the device remain; doping second-side regions of the device into the second side of the substrate; and forming a second-side conductor on the second side of the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of fabricating a bipolar device circuit having a plurality of devices including a first-type device and a second-type device, the second-type being complementary to the first type, the first-type device and second-type device having mutually similar operating characteristics and scalable sizes, the method comprising:
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lightly doping a region of a second-type conductivity into a first side of a substrate having a first-type conductivity, the second-type conductivity being complementary to the first-type conductivity; doping regions of the first-type device into the first side of the first-type conductivity substrate; doping regions of the second-type device into the first side of the substrate in the region of second-type conductivity; forming insulated interconnects interconnecting doped regions of the first-type device and doped regions of the second-type device on the first side of the substrate; forming a dielectric layer on the first side of the substrate overlying the insulated interconnects of the first-type device and the second-type device; bonding a support to the first side of the substrate overlying the dielectric layer thereby forming a composite structure; removing a portion of the substrate on a second side of the substrate opposite the first side of the substrate so that only active regions of the first-type device and the second-type device remain; doping second-side regions of the first-type device into the second side of the first-type conductivity substrate; doping second-side regions of the second-type device into the second side of the substrate in the region of second-type conductivity; forming a second-side conductor on the second side of the substrate. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification