Semiconductor device and method of manufacturing the same
First Claim
1. A semiconductor device comprising:
- a semiconductor substrate;
a first active region and a second active region formed of a semiconductor layer formed on the semiconductor substrate via an insulating layer, the first active region and the second active region each being surrounded when seen in a plan view by a device isolation region penetrating through the semiconductor layer and the insulating layer;
a first MISFET formed in the first active region;
a second MISFET formed in the second active region;
a first region and a second region each surrounded when seen in a plan view by the device isolation region and having the semiconductor layer and the insulating layer removed therefrom;
a first semiconductor region of a first conductivity type formed in the semiconductor substrate so as to include the first active region and the first region when seen in a plan view;
a second semiconductor region of the first conductivity type formed in the semiconductor substrate so as to include the first active region and the first region when seen in a plan view and having impurity concentration higher than that of the first semiconductor region;
a third semiconductor region of a second conductivity type that is different from the first conductivity type formed in the semiconductor substrate so as to include the second active region and the second region when seen in a plan view; and
a fourth semiconductor region of the second conductivity type formed in the semiconductor substrate so as to include the second active region and the second region when seen in a plan view and having impurity concentration higher than that of the third semiconductor region,wherein the second semiconductor region is contained in the first semiconductor region,the second semiconductor region has a bottom surface at a shallower level than a bottom surface of the first semiconductor region and at a deeper level than a bottom surface of a portion of the device isolation region interposed between the first active region and the first region when seen in a plan view,the second semiconductor region extends to also under the portion of the device isolation region interposed between the first active region and the first region when seen in a plan view,the fourth semiconductor region is contained in the third semiconductor region,the fourth semiconductor region has a bottom surface at a shallower level than a bottom surface of the third semiconductor region and at a deeper level than a bottom surface of a portion of the device isolation region interposed between the second active region and the second region when seen in a plan view, andthe fourth semiconductor region extends to also under the portion of the device isolation region interposed between the second active region and the second region when seen in a plan view.
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0 Petitions
Accused Products
Abstract
In an SOI substrate having a semiconductor layer formed on the semiconductor substrate via an insulating layer, a MISFET is formed in each of the semiconductor layer in an nMIS formation region and a pMIS formation region. In power feeding regions, the semiconductor layer and the insulating layer are removed. In the semiconductor substrate, a p-type semiconductor region is formed so as to include the nMIS formation region and one of the power feeding regions, and an n-type semiconductor region is formed so as to include a pMIS formation region and the other one of the power feeding regions. In the semiconductor substrate, a p-type well having lower impurity concentration than the p-type semiconductor region is formed so as to contain the p-type semiconductor region, and an n-type well having lower impurity concentration than the n-type semiconductor region is formed so as to contain the n-type semiconductor region.
5 Citations
19 Claims
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1. A semiconductor device comprising:
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a semiconductor substrate; a first active region and a second active region formed of a semiconductor layer formed on the semiconductor substrate via an insulating layer, the first active region and the second active region each being surrounded when seen in a plan view by a device isolation region penetrating through the semiconductor layer and the insulating layer; a first MISFET formed in the first active region; a second MISFET formed in the second active region; a first region and a second region each surrounded when seen in a plan view by the device isolation region and having the semiconductor layer and the insulating layer removed therefrom; a first semiconductor region of a first conductivity type formed in the semiconductor substrate so as to include the first active region and the first region when seen in a plan view; a second semiconductor region of the first conductivity type formed in the semiconductor substrate so as to include the first active region and the first region when seen in a plan view and having impurity concentration higher than that of the first semiconductor region; a third semiconductor region of a second conductivity type that is different from the first conductivity type formed in the semiconductor substrate so as to include the second active region and the second region when seen in a plan view; and a fourth semiconductor region of the second conductivity type formed in the semiconductor substrate so as to include the second active region and the second region when seen in a plan view and having impurity concentration higher than that of the third semiconductor region, wherein the second semiconductor region is contained in the first semiconductor region, the second semiconductor region has a bottom surface at a shallower level than a bottom surface of the first semiconductor region and at a deeper level than a bottom surface of a portion of the device isolation region interposed between the first active region and the first region when seen in a plan view, the second semiconductor region extends to also under the portion of the device isolation region interposed between the first active region and the first region when seen in a plan view, the fourth semiconductor region is contained in the third semiconductor region, the fourth semiconductor region has a bottom surface at a shallower level than a bottom surface of the third semiconductor region and at a deeper level than a bottom surface of a portion of the device isolation region interposed between the second active region and the second region when seen in a plan view, and the fourth semiconductor region extends to also under the portion of the device isolation region interposed between the second active region and the second region when seen in a plan view. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A semiconductor device comprising:
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a semiconductor substrate; a first active region and a second active region formed of a semiconductor layer formed on the semiconductor substrate via an insulating layer, the first active region and the second active region each being surrounded when seen in a plan view by a device isolation region penetrating through the semiconductor layer and the insulating layer; a first MISFET formed in the first active region; a second MISFET formed in the second active region; a first region and a second region each surrounded when seen in a plan view by the device isolation region and having the semiconductor layer and the insulating layer removed therefrom; a first semiconductor region of a first conductivity type formed in the semiconductor substrate so as to include the first active region and the first region when seen in a plan view; a second semiconductor region of the first conductivity type formed in the semiconductor substrate so as to include the first active region and the first region when seen in a plan view and having impurity concentration higher than that of the first semiconductor region; a third semiconductor region of a second conductivity type that is different from the first conductivity type formed in the semiconductor substrate so as to include the second active region and the second region when seen in a plan view; and a fourth semiconductor region of the second conductivity type formed in the semiconductor substrate so as to include the second active region and the second region when seen in a plan view and having impurity concentration higher than that of the third semiconductor region, wherein the first semiconductor region extends to under the second semiconductor region, the second semiconductor region has a bottom surface at a shallower level than a bottom surface of the first semiconductor region and at a deeper level than a bottom surface of a portion of the device isolation region interposed between the first active region and the first region when seen in a plan view, the second semiconductor region extends to also under the portion of the device isolation region interposed between the first active region and the first region when seen in a plan view, the third semiconductor region extends to under the fourth semiconductor region, the fourth semiconductor region has a bottom surface at a shallower level than a bottom surface of the third semiconductor region and at a deeper level than a bottom surface of a portion of the device isolation region interposed between the second active region and the second region when seen in a plan view, the fourth semiconductor region extends to also under the portion of the device isolation region interposed between the second active region and the second region when seen in a plan view, the second semiconductor region and the fourth semiconductor region are separated from each other by a portion of the device isolation region interposed between the second semiconductor region and the fourth semiconductor region, and the portion of the device isolation region interposed between the second semiconductor region and the fourth semiconductor region has a bottom surface at a deeper level than the bottom surface of the second semiconductor region and the bottom surface of the fourth semiconductor region, at a deeper level than the bottom surface of the portion of the device isolation region interposed between the first active region and the first region when seen in a plan view, and at a deeper level than the bottom surface of the portion of the device isolation region interposed between the second active region and the second region when seen in a plan view. - View Dependent Claims (11)
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12. A semiconductor device manufacturing method comprising the steps of:
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(a) preparing a substrate, the substrate including a semiconductor substrate that has a first region, a second region, a third region, and a fourth region on a main surface of the semiconductor substrate, an insulating layer formed on the main surface of the semiconductor substrate, and a semiconductor layer formed on the insulating layer; (b) forming, on the substrate, a device isolation region penetrating through the semiconductor layer and the insulating layer so that the first region, the second region, the third region, and the fourth region are each surrounded by the device isolation region when seen in a plan view; (c) after the step (b), forming a first semiconductor region of a first conductivity type in the semiconductor substrate so as to include the first region and the third region when seen in a plan view; (d) after the step (b), forming a second semiconductor region of the first conductivity type in the semiconductor substrate so as to include the first region and the third region when seen in a plan view; (e) after the step (b), forming a third semiconductor region of a second conductivity type that is opposite to the first conductivity type in the semiconductor substrate so as to include the second region and the fourth region when seen in a plan view; (f) after the step (b), forming a fourth semiconductor region of the second conductivity type in the semiconductor substrate so as to include the second region and the fourth region when seen in a plan view; (g) after the step (b), removing the semiconductor layer and the insulating layer on the semiconductor substrate in the first region and the second region; and (h) after the steps (b), (c), (d), (e), (f), and (g), forming a first MISFET in the semiconductor layer that is remaining via the insulating layer on the semiconductor substrate in the third region and forming a second MISFET in the semiconductor layer that is remaining via the insulating layer on the semiconductor substrate in the fourth region, wherein the second semiconductor region has impurity concentration higher than that of the first semiconductor region, is contained in the first semiconductor region, and is shallower than the first semiconductor region, the fourth semiconductor region has impurity concentration higher than impurity concentration of the third semiconductor region, is contained in the third semiconductor region, and is shallower than the third semiconductor region, the second semiconductor region has a bottom surface at a deeper level than a bottom surface of a portion of the device isolation region interposed between the first region and the third region when seen in a plan view, the second semiconductor region extends to also under a portion of the device isolation region interposed between the first region and the third region when seen in a plan view, the fourth semiconductor region has a bottom surface at a deeper level than a bottom surface of a portion of the device isolation region interposed between the second region and the fourth region when seen in a plan view, and the fourth semiconductor region extends to also under a portion of the device isolation region interposed between the second region and the fourth region when seen in a plan view. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification