Method for making semiconductor device comprising a superlattice with upper portions extending above adjacent upper portions of source and drain regions
First Claim
1. A method for making a semiconductor device comprising:
- providing a semiconductor substrate; and
forming at least one metal oxide semiconductor field-effect transistor (MOSFET) byforming spaced apart source and drain regions and a superlattice on the semiconductor substrate so that the superlattice is between the source and drain regions, the superlattice comprising a plurality of stacked groups of layers and having upper portions extending above adjacent upper portions of the source and drain regions and lower portions contacting the source and drain regions so that a channel is defined in lower portions of the superlattice,each group of layers of the superlattice comprising a plurality of stacked base semiconductor monolayers defining a base semiconductor portion and an energy band-modifying layer thereon,the energy-band modifying layer comprising at least one non-semiconductor monolayer constrained within a crystal lattice of adjacent base semiconductor portions, and at least some semiconductor atoms from opposing semiconductor portions being chemically bound together through the at least one non-semiconductor monolayer therebetween, andforming a gate overlying the superlattice.
5 Assignments
0 Petitions
Accused Products
Abstract
A method for making a semiconductor device may include providing a semiconductor substrate and forming at least one MOSFET by forming spaced apart source and drain regions and a superlattice on the substrate so that the superlattice is between the source and drain regions. The superlattice may include a plurality of stacked groups of layers. The superlattice may have upper portions extending above adjacent upper portions of the source and drain regions, and lower portions contacting the source and drain regions so that a channel is defined in lower portions of the superlattice. Each group of layers of the superlattice may include a plurality of stacked base semiconductor monolayers defining a base semiconductor portion and an energy band-modifying layer thereon. The energy-band modifying layer may include at least one non-semiconductor monolayer constrained within a crystal lattice of adjacent base semiconductor. The method may further include forming a gate overlying the superlattice.
-
Citations
46 Claims
-
1. A method for making a semiconductor device comprising:
-
providing a semiconductor substrate; and forming at least one metal oxide semiconductor field-effect transistor (MOSFET) by forming spaced apart source and drain regions and a superlattice on the semiconductor substrate so that the superlattice is between the source and drain regions, the superlattice comprising a plurality of stacked groups of layers and having upper portions extending above adjacent upper portions of the source and drain regions and lower portions contacting the source and drain regions so that a channel is defined in lower portions of the superlattice, each group of layers of the superlattice comprising a plurality of stacked base semiconductor monolayers defining a base semiconductor portion and an energy band-modifying layer thereon, the energy-band modifying layer comprising at least one non-semiconductor monolayer constrained within a crystal lattice of adjacent base semiconductor portions, and at least some semiconductor atoms from opposing semiconductor portions being chemically bound together through the at least one non-semiconductor monolayer therebetween, and forming a gate overlying the superlattice. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A method for making a semiconductor device comprising:
-
providing a semiconductor substrate; and forming at least one metal oxide semiconductor field-effect transistor (MOSFET) by forming spaced apart source and drain regions and a superlattice on the semiconductor substrate so that the superlattice is between the source and drain regions, the source and drain regions each having a respective trench therein adjacent the superlattice, and the superlattice having upper portions extending above bottom portions of the trenches and lower portions contacting the source and drain regions so that a channel is defined in lower portions of the superlattice, each group of layers of the superlattice comprising a plurality of stacked base semiconductor monolayers defining a base semiconductor portion and an energy band-modifying layer thereon, the energy-band modifying layer comprising at least one non-semiconductor monolayer constrained within a crystal lattice of adjacent base semiconductor, and at least some semiconductor atoms from opposing semiconductor portions being chemically bound together through the at least one non-semiconductor monolayer therebetween, and forming a gate overlying the superlattice by forming an oxide layer overlying the superlattice channel and a gate electrode overlying the oxide layer. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
-
33. A method for making a semiconductor device comprising:
-
providing a semiconductor substrate; and forming at least one metal oxide semiconductor field-effect transistor (MOSFET) by forming spaced apart source and drain regions and a superlattice on the semiconductor substrate so that the superlattice is between the source and drain regions, the source and drain regions each comprising a respective epitaxial silicon layer, and the superlattice comprising a plurality of stacked groups of layers, the superlattice having a greater thickness than the epitaxial silicon layers, and lower portions of the superlattice being in contact with the epitaxial silicon layers so that a channel is defined in lower portions of the superlattice, each group of layers of the superlattice comprising a plurality of stacked base semiconductor monolayers defining a base semiconductor portion and an energy band-modifying layer thereon, the energy-band modifying layer comprising at least one non-semiconductor monolayer constrained within a crystal lattice of adjacent base semiconductor portions, and at least some semiconductor atoms from opposing semiconductor portions being chemically bound together through the at least one non-semiconductor monolayer therebetween, and forming a gate overlying the superlattice by forming an oxide layer overlying the superlattice channel and a gate electrode overlying the oxide layer. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
-
Specification