Stacked vertical devices
First Claim
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1. A semiconductor structure comprising:
- a first vertical field effect transistor (FET) of a first conductivity type, wherein the first vertical FET comprises;
a first doped epitaxial semiconductor region along sidewalls of a first doped fin region of a semiconductor fin that extends upwards from a semiconductor substrate portion,a first gate structure along sidewalls of a first channel region of the semiconductor fin that is located above the first doped fin region, anda second doped epitaxial semiconductor region along sidewalls of a second doped fin region of the semiconductor fin that is located above the first channel region;
a second vertical FET of a second conductivity type stacked on the first vertical FET, wherein the second vertical FET comprises;
a third doped epitaxial semiconductor region along sidewalls of a third doped fin region of the semiconductor fin that is located atop the second doped fin region,a second gate structure along sidewalls of a second channel region of the semiconductor fin that is located above the third doped fin region, anda fourth doped epitaxial semiconductor region along sidewalls a fourth doped fin region of the semiconductor that is located above the second channel region; and
a conductive strap structure laterally contacting the second doped epitaxial semiconductor region and the third doped epitaxial semiconductor region.
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Abstract
A semiconductor structure containing a plurality of stacked vertical field effect transistor (FETs) is provided. After forming a first vertical FET of a first conductivity type at a lower portion of a semiconductor fin, a second vertical FET of a second conductivity type is formed on top of the first vertical FET. The second conductivity type can be opposite to, or the same as, the first conductivity type. A source/drain region of the first vertical FET is electrically connected to a source/drain region of the second vertical FET by a conductive strip structure.
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11 Claims
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1. A semiconductor structure comprising:
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a first vertical field effect transistor (FET) of a first conductivity type, wherein the first vertical FET comprises; a first doped epitaxial semiconductor region along sidewalls of a first doped fin region of a semiconductor fin that extends upwards from a semiconductor substrate portion, a first gate structure along sidewalls of a first channel region of the semiconductor fin that is located above the first doped fin region, and a second doped epitaxial semiconductor region along sidewalls of a second doped fin region of the semiconductor fin that is located above the first channel region; a second vertical FET of a second conductivity type stacked on the first vertical FET, wherein the second vertical FET comprises; a third doped epitaxial semiconductor region along sidewalls of a third doped fin region of the semiconductor fin that is located atop the second doped fin region, a second gate structure along sidewalls of a second channel region of the semiconductor fin that is located above the third doped fin region, and a fourth doped epitaxial semiconductor region along sidewalls a fourth doped fin region of the semiconductor that is located above the second channel region; and a conductive strap structure laterally contacting the second doped epitaxial semiconductor region and the third doped epitaxial semiconductor region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification