Termination structure incorporating insulator in a trench
First Claim
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1. A semiconductor device comprising:
- a first layer of first conductivity type having an upper surface;
a diffusion region of second conductivity type formed along the surface end extending to a first depth within the first layer, said diffusion region forming a pn junction with the first layer;
a dielectric layer formed within the first layer and extending to at least the first depth, said dielectric layer positioned between the diffusion region and a peripheral region of the device, said dielectric layer in abutment with the diffusion region; and
a field plate disposed upon and in contact with at least a portion of each of the diffusion region and the dielectric layer.
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Abstract
A power semiconductor device 10 has increased breakdown voltage due to an oxide termination structure. A peripheral trench 58 is filled with a dielectric material, such as silicon dioxide. The trench extends below the P well 22 that includes the source 32. The electric field at the border to P well 22 and trench 60 turns upward toward the surface and passes through dielectric 60. A field plate 64 coves portions of the P well 22 and the dielectric 60.
42 Citations
13 Claims
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1. A semiconductor device comprising:
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a first layer of first conductivity type having an upper surface;
a diffusion region of second conductivity type formed along the surface end extending to a first depth within the first layer, said diffusion region forming a pn junction with the first layer;
a dielectric layer formed within the first layer and extending to at least the first depth, said dielectric layer positioned between the diffusion region and a peripheral region of the device, said dielectric layer in abutment with the diffusion region; and
a field plate disposed upon and in contact with at least a portion of each of the diffusion region and the dielectric layer. - View Dependent Claims (2, 3, 4, 5, 10)
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6. A semiconductor device with a field plate structure formed along an outer periphery thereof, comprising:
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a semiconductor layer of predominately a first net conductivity type;
a diffusion region of a second net conductivity type formed in an upper surface of the semiconductor layer;
an insulator layer formed in contact with the diffusion region and extending into the semiconductor layer to at least the same depth as the diffusion region; and
a field plate disposed at least partially over and in contact with each of the diffusion region and the insulator layer. - View Dependent Claims (7, 8, 9)
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11. A field plate termination structure for a semiconductor device, said semiconductor device having a first layer of a first conductivity type, said first layer having an upper surface, a diffusion region of second conductivity type formed along the upper surface and extending to a first depth within the first layer, said diffusion region forming a p-n junction with the first layer, said field plate termination structure comprising:
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a dielectric layer formed at least partially within the first layer and extending to at least the first depth, said dielectric layer positioned between the diffusion region and a peripheral region of the device, said dielectric layer in abutment with the diffusion region;
a field plate member disposed upon and in contact with at least a portion of each of the diffusion region and the dielectric layer; and
a field termination member disposed between said field plate member and the peripheral region. - View Dependent Claims (12, 13)
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Specification