Shielded gate field effect transistor with improved inter-poly dielectric
First Claim
Patent Images
1. A field effect transistor (FET) comprising:
- a trench extending into a silicon region of a first conductivity type;
a shield electrode in a lower portion of the trench, the shield electrode being insulated from the silicon region by a shield dielectric; and
a gate electrode in the trench over but insulated from the shield electrode by an inter-poly dielectric (IPD), the IPD comprising a conformal layer of dielectric and a thermal oxide layer.
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Abstract
A field effect transistor (FET) includes a trench extending into a silicon region of a first conductive type. A shield insulated from the silicon region by a shield dielectric extends in a lower portion of the trench. A gate electrode is in the trench over but insulated from the shield electrode by an inter-poly dielectric (IPD). The IPD comprises a conformal layer of dielectric and a thermal oxide layer.
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Citations
21 Claims
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1. A field effect transistor (FET) comprising:
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a trench extending into a silicon region of a first conductivity type; a shield electrode in a lower portion of the trench, the shield electrode being insulated from the silicon region by a shield dielectric; and a gate electrode in the trench over but insulated from the shield electrode by an inter-poly dielectric (IPD), the IPD comprising a conformal layer of dielectric and a thermal oxide layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A field effect transistor (FET) comprising:
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a trench extending into a silicon region of a first conductivity type; a shield electrode in a lower portion of the trench, the shield electrode being insulated from the silicon region by a shield dielectric; and a gate electrode in the trench over but insulated from the shield electrode by an inter-poly dielectric (IPD) having a concave profile along at least a center portion of its upper surface. - View Dependent Claims (12, 13, 14, 15)
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16. A field effect transistor (FET) comprising:
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a trench extending into a silicon region of a first conductivity type; a shield electrode in a lower portion of the trench, the shield electrode being insulated from the silicon region by a shield dielectric; and a gate electrode in the trench over but insulated from the shield electrode by an inter-poly dielectric (IPD), the IPD comprising a conformal layer of dielectric which has a convex profile along its lower surface and a concave profile along its upper surface. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification