Circuit with transistors integrated in three dimensions and having a dynamically adjustable threshold voltage VT
First Claim
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1. A microelectronic device comprising:
- a substrate surmounted by a stack of layers,at least one first transistor situated at a given level of said stack,at least one second transistor situated at a second level of said stack, above said given level, the first transistor comprising a gate electrode situated opposite a channel zone of the second transistor, the first transistor and the second transistor being separated by an insulating zone,said insulating zone being constituted of several different dielectric materials including a first dielectric material and a second dielectric material, and having in a first region extending from a top surface of said gate electrode of said first transistor to a bottom surface of said channel of said second transistor, a composition and a thickness provided so as to form a first electric capacitance C1 between the gate electrode of the first transistor and the channel of the second transistor, said first region only including the first dielectric material, said insulating zone comprising a second region that includes the second dielectric material extending from a bottom of the channel of the second transistor to a top surface of at least one access zone of the first transistor and having a thickness so as to form a second electric capacitance C2 between said access zone of the first transistor an access zone of the second transistor, such that C2<
C1.
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Abstract
A microelectronic device including: a substrate surmounted by a stack of layers, at least one first transistor situated at a given level of said stack, at least one second transistor situated at a second level of said stack, above said given level, the first transistor including a gate electrode situated opposite a channel zone of the second transistor, the first transistor and the second transistor being separated by an insulating zone, and said insulating zone being constituted of several different dielectric materials include a first dielectric material and a second dielectric material.
222 Citations
19 Claims
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1. A microelectronic device comprising:
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a substrate surmounted by a stack of layers, at least one first transistor situated at a given level of said stack, at least one second transistor situated at a second level of said stack, above said given level, the first transistor comprising a gate electrode situated opposite a channel zone of the second transistor, the first transistor and the second transistor being separated by an insulating zone, said insulating zone being constituted of several different dielectric materials including a first dielectric material and a second dielectric material, and having in a first region extending from a top surface of said gate electrode of said first transistor to a bottom surface of said channel of said second transistor, a composition and a thickness provided so as to form a first electric capacitance C1 between the gate electrode of the first transistor and the channel of the second transistor, said first region only including the first dielectric material, said insulating zone comprising a second region that includes the second dielectric material extending from a bottom of the channel of the second transistor to a top surface of at least one access zone of the first transistor and having a thickness so as to form a second electric capacitance C2 between said access zone of the first transistor an access zone of the second transistor, such that C2<
C1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A microelectronic device comprising:
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a substrate surmounted by a stack of layers, at least one first transistor situated at a given level of said stack, at least one second transistor situated at a second level of said stack, above said given level, the first transistor comprising a gate electrode situated opposite a channel zone of the second transistor, the first transistor and the second transistor being separated by an insulating zone, said insulating zone being constituted of several different dielectric materials including a first dielectric material and a second dielectric material, and having in a first region extending from a top surface of said gate electrode of said first transistor to a bottom surface of said channel of said second transistor, a composition and a thickness provided so as to form a first electric capacitance C1 between the gate electrode of the first transistor and the channel of the second transistor, said first region is formed only of the first dielectric material having a first dielectric constant k1, said insulating zone comprising a second region that extends from a bottom of the channel of the second transistor to a top surface of at least one access zone of the first transistor and that includes a stack of the first dielectric material and the second dielectric material having a second dielectric constant k2 such that k2<
k1, the second region having a thickness so as to form a second electric capacitance C2 between said access zone of the first transistor and an access zone of the second transistor, such that C2<
C1.
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Specification