Semiconductor device having ferroelectric or negative capacitor and method of manufacturing the same, and electronic device
View Patent ↗A semiconductor device having a ferroelectric/negative capacitor and a method of manufacturing the same, and an electronic device including the semiconductor device are provided. According to the embodiments, the semiconductor device may include: a gate electrode and a source/drain electrode formed on a substrate; a positive capacitor formed on the substrate, a first terminal of the positive capacitor being electrically connected to the gate electrode; a ferroelectric or negative capacitor formed on the substrate, a first terminal of the ferroelectric or negative capacitor being electrically connected to the gate electrode, wherein a second terminal of one of the positive capacitor and the ferroelectric or negative capacitor is electrically connected to a gate voltage application terminal, and a second terminal of the other of the positive capacitor and the ferroelectric or negative capacitor is electrically connected to the source/drain electrode.
1 . A semiconductor device, comprising:
a gate electrode and a source/drain electrode formed on a substrate;
a positive capacitor formed on the substrate, a first terminal of the positive capacitor being electrically connected to the gate electrode; and
a ferroelectric or negative capacitor formed on the substrate, a first terminal of the ferroelectric or negative capacitor being electrically connected to the gate electrode,
wherein a second terminal of one of the positive capacitor and the ferroelectric or negative capacitor is electrically connected to a gate voltage application terminal, and a second terminal of the other of the positive capacitor and the ferroelectric or negative capacitor is electrically connected to the source/drain electrode;
wherein the semiconductor device further comprises:
an active region formed on the substrate;
a gate stack formed on and intersecting the active region, the gate stack including a gate dielectric layer and a gate conductor layer, wherein the gate electrode is led out from the gate conductor layer; and
source/drain regions formed in the active region on opposite sides of the gate stack, wherein the source/drain electrode is led out from one of the source/drain regions,
one of the positive capacitor and the ferroelectric or negative capacitor comprises a U-shaped first dielectric layer, a first electrode plate extending along a sidewall and a bottom surface of the U-shaped first dielectric layer and a second electrode plate formed on an inner side of the U-shaped first dielectric layer, wherein the first electrode plate and the second electrode plate are opposite to each other with the first dielectric layer sandwiched therebetween, the first electrode plate is electrically connected to the gate conductor layer, and the second electrode plate is electrically connected to the gate voltage application terminal,
the other of the positive capacitor and the ferroelectric or negative capacitor comprises a second dielectric layer formed on a sidewall, close to one of the source/drain regions, of the first electrode plate and a third electrode plate formed on the second dielectric layer, wherein the first electrode plate and the third electrode plate are opposite to each other with the second dielectric layer sandwiched therebetween, and the third electrode plate is electrically connected to one of the source/drain regions.
2 . The semiconductor device according to claim 1 , wherein the semiconductor device comprises a metal oxide semiconductor field effect transistor MOSFET.
3 . The semiconductor device according to claim 2 , wherein an absolute value of a capacitance value of the ferroelectric or negative capacitor is greater than a sum of a capacitance value of the positive capacitor, a capacitance value between the gate electrode of the MOSFET and the source/drain electrode of the MOSFET, and a capacitance value between the gate electrode of the MOSFET and another source/drain electrode of the MOSFET.
4 . The semiconductor device according to claim 3 , wherein the MOSFET has a subthreshold swing of less than 60 mV/dec at a temperature of 300K.
5 . The semiconductor device according to claim 1 , wherein,
one of the positive capacitor and the ferroelectric or negative capacitor is disposed above the gate stack and at least partially overlaps the gate stack in a vertical direction, and
the other of the positive capacitor and the ferroelectric or negative capacitor is disposed above one of the source/drain regions and at least partially overlaps one of the source/drain regions in the vertical direction.
6 . The semiconductor device according to claim 1 , wherein a portion of the first electrode plate adjacent to the second dielectric layer is thickened relative to other portions of the first electrode plate.
7 . The semiconductor device according to claim 1 , further comprising:
a first interlayer dielectric layer formed on the substrate;
a first contact portion to the gate conductor layer and a second contact portion to one of the source/drain regions formed in the first interlayer dielectric layer;
a second interlayer dielectric layer on the first interlayer dielectric layer, wherein the positive capacitor and the ferroelectric or negative capacitor are formed in the second interlayer dielectric layer,
wherein one of the positive capacitor and the ferroelectric or negative capacitor overlaps the first contact portion in a vertical direction, and the first electrode plate is in contact with the first contact portion, and
the other of the positive capacitor and the ferroelectric or negative capacitor overlaps the second contact portion in the vertical direction, and the third electrode plate is in contact with the second contact portion.
8 . The semiconductor device according to claim 1 , wherein one of the first dielectric layer and the second dielectric layer comprises a dielectric material, and the other of the first dielectric layer and the second dielectric layer comprises a ferroelectric or negative capacitance material.
9 . The semiconductor device according to claim 8 , wherein the ferroelectric or negative capacitance material comprises an oxide containing Hf, Zr and/or Si.
10 . The semiconductor device according to claim 1 , further comprising:
another capacitor electrically connected to the other of the source/drain regions, the another capacitor comprising a third dielectric layer formed on a sidewall, close to the other of the source/drain regions, of the first electrode plate and a fourth electrode plate formed on the third dielectric layer, wherein the first electrode plate and the fourth electrode plate are opposite to each other with the third dielectric layer sandwiched therebetween, and the fourth electrode plate is electrically connected to the other of the source/drain regions.
11 . The semiconductor device according to claim 10 , wherein the third dielectric layer and the second dielectric layer comprise a same material and have substantially a same thickness.
12 . The semiconductor device according to claim 11 , wherein the fourth electrode plate and the third electrode plate comprise a same material and have substantially a same thickness.
13 . An electronic device comprising the semiconductor device of claim 1 .
14 . The electronic device according to claim 13 , comprising a smart phone, a computer, a tablet computer, a wearable smart device, an artificial intelligence device, or a mobile power supply.