Abstract: The disclosure develops a multi-scale model that partitions the device into different spatial regions where the high carrier domains are treated as reservoirs in local equilibrium and serve as injectors and receptors of carriers into the neighboring reservoirs through tunneling and thermionic emission. The nonequilibrium Green's function (NEGF) formalism is used to compute the dynamics (states) and the kinetics (filling of states) in the entire extended complex device. The local density of states in the whole device is computed quantum mechanically within a multi-band tight binding Hamiltonian. The model results agree with experimental I-V curves quantitatively.

Abstract: The disclosure develops a multi-scale model that partitions the device into different spatial regions where the high carrier domains are treated as reservoirs in local equilibrium and serve as injectors and receptors of carriers into the neighboring reservoirs through tunneling and thermionic emission. The nonequilibrium Green's function (NEGF) formalism is used to compute the dynamics (states) and the kinetics (filling of states) in the entire extended complex device. The local density of states in the whole device is computed quantum mechanically within a multi-band tight binding Hamiltonian. The model results agree with experimental I-V curves quantitatively.

Abstract: A tunnel field effect transistor (TFET) device includes a substrate, heavily doped source and drain regions disposed at opposite ends of a channel region forming a PiN or NiP structure, the channel region including a first substantially parallelogram portion having a first length defined along a longitudinal axis extending from the source region to the drain region and a second substantially parallelogram portion having a second length defined along the longitudinal axis larger than the first length, the TFET device having an effective channel length that is an average of the first and second lengths. The channel region includes a channel material with a first effective mass along a longitudinal axis extending from the source region to the drain region and a second effective mass along a lateral axis perpendicular to the longitudinal axis, the first effective mass being greater than the second effective mass.

Abstract: A tunnel field effect transistor (TFET) device includes a substrate, heavily doped source and drain regions disposed at opposite ends of a channel region forming a PiN or NiP structure, the channel region including a first substantially parallelogram portion having a first length defined along a longitudinal axis extending from the source region to the drain region and a second substantially parallelogram portion having a second length defined along the longitudinal axis larger than the first length, the TFET device having an effective channel length that is an average of the first and second lengths. The channel region includes a channel material with a first effective mass along a longitudinal axis extending from the source region to the drain region and a second effective mass along a lateral axis perpendicular to the longitudinal axis, the first effective mass being greater than the second effective mass.

Abstract: A method for modeling a material at least partially-defined by atomic information includes, for each of a plurality of configurations of the material, determining energy moments for a density of states of the respective configuration of the material, and generating a tight binding Hamiltonian matrix for the respective configuration of the material. The method further includes, for each of the plurality of configurations of the material, forming a tight binding model of the configuration of the material by resolving a linking of (i) the energy moments for the density of states of the material to (ii) the tight binding Hamiltonian matrix for the material. Still further the method includes, based on the tight binding models for each of the configurations of the material, forming an environmentally-adapted tight binding model.

Abstract: A method for modeling a material at least partially-defined by atomic information includes, for each of a plurality of configurations of the material, determining energy moments for a density of states of the respective configuration of the material, and generating a tight binding Hamiltonian matrix for the respective configuration of the material. The method further includes, for each of the plurality of configurations of the material, forming a tight binding model of the configuration of the material by resolving a linking of (i) the energy moments for the density of states of the material to (ii) the tight binding Hamiltonian matrix for the material.

Abstract: A tunnel field effect transistor (TFET) includes a substrate, heavily doped source and drain regions disposed at opposite ends of a channel region forming a PiN or NiP structure, the channel region including a first substantially parallelogram portion having a first length defined along a longitudinal axis extending from the source region to the drain region and a second substantially parallelogram portion having a second length defined along the longitudinal axis larger than the first length, the TFET device having an effective channel length that is an average of the first and second lengths. The channel region includes a channel material with a first effective mass along a longitudinal axis extending from the source region to the drain region and a second effective mass along a lateral axis perpendicular to the longitudinal axis, the first effective mass being greater than the second effective mass.

Abstract: The disclosure develops a multi-scale model that partitions the device into different spatial regions where the high carrier domains are treated as reservoirs in local equilibrium and serve as injectors and receptors of carriers into the neighboring reservoirs through tunneling and thermionic emission. The nonequilibrium Green's function (NEGF) formalism is used to compute the dynamics (states) and the kinetics (filling of states) in the entire extended complex device. The local density of states in the whole device is computed quantum mechanically within a multi-band tight binding Hamiltonian. The model results agree with experimental I-V curves quantitatively.

Abstract: A tunnel field effect transistor (TFET) device is disclosed. The TFET includes a substrate, heavily doped source and drain regions disposed at opposite ends of the substrate separated by a channel region forming a PiN or NiP structure, the channel region including a first substantially parallelogram portion having a first length defined along a longitudinal axis extending from the source region to the drain region and a second substantially parallelogram portion having a second length defined along the longitudinal axis larger than the first length, the TFET device having an effective channel length defined along the longitudinal axis that is an average of the first and second lengths. The channel region includes a channel material with a first effective mass along a longitudinal axis extending from the source region to the drain region and a second effective mass along a lateral axis perpendicular to the longitudinal axis.

Abstract: A method for modeling a material at least partially-defined by atomic information includes, for each of a plurality of configurations of the material, determining energy moments for a density of states of the respective configuration of the material, and generating a tight binding Hamiltonian matrix for the respective configuration of the material. The method further includes, for each of the plurality of configurations of the material, forming a tight binding model of the configuration of the material by resolving a linking of (i) the energy moments for the density of states of the material to (ii) the tight binding Hamiltonian matrix for the material. Still further the method includes, based on the tight binding models for each of the configurations of the material, forming an environmentally-adapted tight binding model.

Abstract: A method for modeling a material at least partially-defined by atomic information includes, for each of a plurality of configurations of the material, determining energy moments for a density of states of the respective configuration of the material, and generating a tight binding Hamiltonian matrix for the respective configuration of the material. The method further includes, for each of the plurality of configurations of the material, forming a tight binding model of the configuration of the material by resolving a linking of (i) the energy moments for the density of states of the material to (ii) the tight binding Hamiltonian matrix for the material.

Abstract: A method for modeling a material at least partially-defined by atomic information includes, for each of a plurality of configurations of the material, determining energy moments for a density of states of the respective configuration of the material, and generating a tight binding Hamiltonian matrix for the respective configuration of the material. The method further includes, for each of the plurality of configurations of the material, forming a tight binding model of the configuration of the material by resolving a linking of (i) the energy moments for the density of states of the material to (ii) the tight binding Hamiltonian matrix for the material. Still further the method includes, based on the tight binding models for each of the configurations of the material, forming an environmentally-adapted tight binding model.

Abstract: A method for modeling a material at least partially-defined by atomic information includes, for each of a plurality of configurations of the material, determining energy moments for a density of states of the respective configuration of the material, and generating a tight binding Hamiltonian matrix for the respective configuration of the material. The method further includes, for each of the plurality of configurations of the material, forming a tight binding model of the configuration of the material by resolving a linking of (i) the energy moments for the density of states of the material to (ii) the tight binding Hamiltonian matrix for the material. Still further the method includes, based on the tight binding models for each of the configurations of the material, forming an environmentally-adapted tight binding model.

Abstract: Illustrative embodiments of a vertical tunneling field effect transistor are disclosed which may comprise a semiconductor body including a source region doped with a first dopant type and a pocket region doped with a second dopant type, where the pocket region is formed above the source region. The transistor may also comprise an insulated gate formed above the source and pocket regions, the insulated gate being configured to generate electron tunneling between the source and pocket regions if a voltage is applied to the insulated gate. The transistor may further comprise a lateral tunneling barrier formed to substantially prevent electron tunneling between the source region and a drain region of the semiconductor body, where the drain region is doped with the second dopant type.

Abstract: Illustrative embodiments of a vertical tunneling field effect transistor are disclosed which may comprise a semiconductor body including a source region doped with a first dopant type and a pocket region doped with a second dopant type, where the pocket region is formed above the source region. The transistor may also comprise an insulated gate formed above the source and pocket regions, the insulated gate being configured to generate electron tunneling between the source and pocket regions if a voltage is applied to the insulated gate. The transistor may further comprise a lateral tunneling barrier formed to substantially prevent electron tunneling between the source region and a drain region of the semiconductor body, where the drain region is doped with the second dopant type.

Abstract: A negative differential resistance device is provided that includes a first barrier, a second barrier and a third barrier. A first quantum well is formed between the first and second barriers. A second quantum well is formed between the second and third barriers.

Abstract: A negative differential resistance device is provided that includes a first barrier, a second barrier and a third barrier. A first quantum well is formed between the first and second barriers. A second quantum well is formed between the second and third barriers.

Abstract: A negative differential resistance device is provided that includes a first barrier, a second barrier and a third barrier. A first quantum well is formed between the first and second barriers. A second quantum well is formed between the second and third barriers.