Semiconductor device
First Claim
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1. A semiconductor device, comprising:
- a source metallization;
a first field-effect structure including a source region of a first conductivity type, the source region being electrically connected to the source metallization;
a body region of a second conductivity type adjacent to the source region;
a first gate electrode and a first insulating region which is arranged at least between the first gate electrode and the body region, the first gate electrode, the first insulating region and the body region forming a first capacitance, the first capacitance having a first capacitance per unit area;
wherein the first gate electrode is in a trench in the body region;
a second field-effect structure including a source region of the first conductivity type;
a body region of the second conductivity type adjacent to the source region;
a second gate electrode and a second insulating region which is arranged at least between the second gate electrode and the body region, the source region and the second gate electrode being electrically connected to the source metallization;
the second gate electrode, the second insulating region and the body region forming a second capacitance, the second capacitance having a second capacitance per unit area;
wherein the second gate electrode is in a trench in the body region;
the second capacitance per unit area being larger than the first capacitance per unit area;
the first insulating region having a first thickness d1 between the first gate electrode and the body region;
the second insulating region having a second thickness d2 between the second gate electrode and the body region; and
wherein the second thickness d2 is smaller than the first thickness d1.
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Abstract
A semiconductor device includes a source metallization, a source region of a first conductivity type in contact with the source metallization, a body region of a second conductivity type which is adjacent to the source region. The semiconductor device further includes a first field-effect structure including a first insulated gate electrode and a second field-effect structure including a second insulated gate electrode which is electrically connected to the source metallization. The capacitance per unit area between the second insulated gate electrode and the body region is larger than the capacitance per unit area between the first insulated gate electrode and the body region.
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Citations
17 Claims
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1. A semiconductor device, comprising:
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a source metallization; a first field-effect structure including a source region of a first conductivity type, the source region being electrically connected to the source metallization;
a body region of a second conductivity type adjacent to the source region;
a first gate electrode and a first insulating region which is arranged at least between the first gate electrode and the body region, the first gate electrode, the first insulating region and the body region forming a first capacitance, the first capacitance having a first capacitance per unit area;
wherein the first gate electrode is in a trench in the body region;a second field-effect structure including a source region of the first conductivity type;
a body region of the second conductivity type adjacent to the source region;
a second gate electrode and a second insulating region which is arranged at least between the second gate electrode and the body region, the source region and the second gate electrode being electrically connected to the source metallization;
the second gate electrode, the second insulating region and the body region forming a second capacitance, the second capacitance having a second capacitance per unit area;
wherein the second gate electrode is in a trench in the body region;the second capacitance per unit area being larger than the first capacitance per unit area; the first insulating region having a first thickness d1 between the first gate electrode and the body region; the second insulating region having a second thickness d2 between the second gate electrode and the body region; and wherein the second thickness d2 is smaller than the first thickness d1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A semiconductor device, comprising:
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a source metallization; a first field-effect structure including a source region of a first conductivity type, the source region being electrically connected to the source metallization;
a body region of a second conductivity type adjacent to the source region;
a first gate electrode and a first insulating region which is arranged at least between the first gate electrode and the body region, the first gate electrode, the first insulating region and the body region forming a first capacitance, the first capacitance having a first capacitance per unit area;
wherein the first gate electrode is in a trench in the body region;a second field-effect structure including a source region of the first conductivity type;
a body region of the second conductivity type adjacent to the source region;
a second gate electrode and a second insulating region which is arranged at least between the second gate electrode and the body region, the source region and the second gate electrode being electrically connected to the source metallization;
the second gate electrode, the second insulating region and the body region forming a second capacitance, the second capacitance having a second capacitance per unit area;
wherein the second gate electrode is in a trench in the body region;the second capacitance per unit area being larger than the first capacitance per unit area; and wherein the first insulating region has a first permittivity and wherein the second insulating region has a second permittivity which is higher than the first permittivity. - View Dependent Claims (13)
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14. A semiconductor device, comprising:
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a source metallization; a first field-effect structure including a source region of a first conductivity type, the source region being electrically connected to the source metallization;
a body region of a second conductivity type adjacent to the source region;
a first gate electrode and a first insulating region which is arranged at least between the first gate electrode and the body region, the first gate electrode, the first insulating region and the body region forming a first capacitance, the first capacitance having a first capacitance per unit area;
wherein the first gate electrode is in a trench in the body region;a second field-effect structure including a source region of the first conductivity type;
a body region of the second conductivity type adjacent to the source region;
a second gate electrode and a second insulating region which is arranged at least between the second gate electrode and the body region, the source region and the second gate electrode being electrically connected to the source metallization;
the second gate electrode, the second insulating region and the body region forming a second capacitance, the second capacitance having a second capacitance per unit area;
wherein the second gate electrode is in a trench in the body region;the second capacitance per unit area being larger than the first capacitance per unit area; and wherein the body region includes a first body sub-region adjoining the first insulating region and a second body sub-region adjoining the second insulating region, wherein the doping concentration of the second body sub-region is lower than the doping concentration of the first body sub-region.
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15. A semiconductor device, comprising:
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a source metallization; a first field-effect structure including a source region of a first conductivity type, the source region being electrically connected to the source metallization;
a body region of a second conductivity type adjacent to the source region;
a first gate electrode and a first insulating region which is arranged at least between the first gate electrode and the body region, the first gate electrode, the first insulating region and the body region forming a first capacitance, the first capacitance having a first capacitance per unit area;
wherein the first gate electrode is in a trench in the body region;a second field-effect structure including a source region of the first conductivity type;
a body region of the second conductivity type adjacent to the source region;
a second gate electrode and a second insulating region which is arranged at least between the second gate electrode and the body region, the source region and the second gate electrode being electrically connected to the source metallization;
the second gate electrode, the second insulating region and the body region forming a second capacitance, the second capacitance having a second capacitance per unit area;
wherein the second gate electrode is in a trench in the body region;the second capacitance per unit area being larger than the first capacitance per unit area; and wherein the first gate electrode includes a material having a first workfunction, and wherein the second gate electrode includes a material having a second workfunction which is smaller than the first work function.
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16. A semiconductor device, comprising:
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a source metallization; a first field-effect structure including a source region of a first conductivity type, the source region being electrically connected to the source metallization;
a body region of a second conductivity type adjacent to the source region;
a first gate electrode and a first insulating region which is arranged at least between the first gate electrode and the body region, the first gate electrode, the first insulating region and the body region forming a first capacitance, the first capacitance having a first capacitance per unit area;
wherein the first gate electrode is in a trench in the body region;a second field-effect structure including a source region of the first conductivity type;
a body region of the second conductivity type adjacent to the source region;
a second gate electrode and a second insulating region which is arranged at least between the second gate electrode and the body region, the source region and the second gate electrode being electrically connected to the source metallization;
the second gate electrode, the second insulating region and the body region forming a second capacitance, the second capacitance having a second capacitance per unit area;
wherein the second gate electrode is in a trench in the body region;the second capacitance per unit area being larger than the first capacitance per unit area; and wherein the second capacitance per unit area is larger than about 4.3 nF/mm2.
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17. A semiconductor device, comprising:
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a common source metallization; a first field-effect structure including a source region of a first conductivity type, the source region being electrically connected to the common source metallization;
a body region of a second conductivity type adjacent to the source region;
a first gate electrode and a first insulating region of a first equivalent oxide thickness which is arranged at least between the first gate electrode and the body region;
wherein the first gate electrode is in a trench in the body region; anda second field-effect structure including a source region of the first conductivity type;
a body region of the second conductivity type adjacent to the source region;
a second gate electrode and a second insulating region of a second equivalent oxide thickness which is arranged at least between the second gate electrode and the body region, the source region and the second gate electrode being electrically connected to the common source metallization;
the second equivalent oxide thickness being lower than the first equivalent oxide thickness;
wherein the second gate electrode is in a trench in the body region.
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Specification