Electronic device including a tapered trench and a conductive structure therein
First Claim
1. A transistor structure comprising:
- a semiconductor layer overlying a substrate and having a primary surface that generally corresponds to a first plane;
a trench extending into the semiconductor layer and having a tapered shape including a relatively wider portion adjacent to the primary surface and a relatively narrower portion farther from the primary surface as compared to the relatively wider portion, wherein, from a cross-sectional view, the relatively narrower portion is defined by a substantially planar sidewall that lies along a second plane that intersects the first plane at an angle of greater than approximately 70°
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a doped semiconductor region that lies adjacent to a sidewall of the trench having the tapered shape, wherein the doped semiconductor region extends to the narrower portion and has a dopant concentration greater than a dopant concentration of the semiconductor layer at a location adjacent to the primary surface, and wherein the doped semiconductor region is part of the drain region of the transistor structure; and
a gate member disposed outside of the trench.
3 Assignments
0 Petitions
Accused Products
Abstract
An electronic device can include a semiconductor layer, and a trench extending into the semiconductor layer and having a tapered shape. In an embodiment, the trench includes a wider portion and a narrower portion. The electronic device can include a doped semiconductor region that extends to a narrower portion of the trench and has a dopant concentration greater than a dopant concentration of the semiconductor layer. In another embodiment, the electronic device can include a conductive structure within a relatively narrower portion of the trench, and a conductive electrode within a relatively wider portion of the trench. In another embodiment, a process of forming the electronic device can include forming a sacrificial plug and may allow insulating layers of different thicknesses to be formed within the trench.
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Citations
20 Claims
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1. A transistor structure comprising:
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a semiconductor layer overlying a substrate and having a primary surface that generally corresponds to a first plane; a trench extending into the semiconductor layer and having a tapered shape including a relatively wider portion adjacent to the primary surface and a relatively narrower portion farther from the primary surface as compared to the relatively wider portion, wherein, from a cross-sectional view, the relatively narrower portion is defined by a substantially planar sidewall that lies along a second plane that intersects the first plane at an angle of greater than approximately 70°
;a doped semiconductor region that lies adjacent to a sidewall of the trench having the tapered shape, wherein the doped semiconductor region extends to the narrower portion and has a dopant concentration greater than a dopant concentration of the semiconductor layer at a location adjacent to the primary surface, and wherein the doped semiconductor region is part of the drain region of the transistor structure; and
a gate member disposed outside of the trench. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A transistor structure comprising:
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a semiconductor layer overlying a substrate and having a primary surface that generally corresponds to a first plane; a trench having a first portion, a second portion, and a third portion, wherein; the first, second, and third portions are disposed within the semiconductor layer; the first and third portions are tapered; and from a cross-sectional view, the second portion is defined by a sidewall that lies along a second plane that intersects the first plane at an angle of greater than approximately 70°
; anda doped semiconductor region disposed along the first, second, and third portions of the trench;
wherein the doped semiconductor region is part of the drain region of the transistor structure. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An electronic device comprising:
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a semiconductor layer overlying a substrate and having a primary surface, wherein the primary surface generally lies substantially along a plane; a trench having a tapered shape; a conductive structure within a relatively narrower portion of the trench; a conductive electrode within a relatively wider portion of the trench, wherein the conductive electrode and the conductive structure are electrically insulated from each other; and a doped semiconductor region adjacent to the primary surface and electrically connected to the conductive structure. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification