Abstract:
An emitter includes an electron supply layer, a dielectric layer on the electron supply layer defining an emission area, and a filled zeolite emission layer within the defined emission area and in contact with the electron supply layer. The filled zeolite emission layer holds a semiconductor material within the cage of the zeolite.
Abstract:
A method for emitting electrons includes the steps of applying a voltage to an electron source to cause hot electrons to be generated with the source, and applying an electric field to cause at least a portion of the hot electrons to be emitted from the electron source.
Abstract:
A field emission device, which among other things may be used within an ultra-high density storage system, is disclosed. The emitter device includes an emitter electrode, an extractor electrode, and a solid-state field controlled emitter that utilizes a Schottky metal-semiconductor junction or barrier. The Schottky metal-semiconductor barrier is formed on the emitter electrode and electrically couples with the extractor electrode such that when an electric potential is placed between the emitter electrode and the extractor electrode, a field emission of electrons is generated from an exposed surface of the semiconductor layer. Further, the Schottky metal may be selected from typical conducting layers such as platinum, gold, silver, or a conductive semiconductor layer that is able to provide a high electron pool at the barrier. The semiconductor layer placed on the Schottky metal is typically very weakly conductive of n-type and has a wide band gap in order to create conditions conducive to creating induced negative electron affinity at applied fields necessary to provide electron emission. One type of wide band-gap material can be selected from titanium dioxide or titanium nitride or other comparable materials.
Abstract:
A cold electron emitter may include a heavily a p-doped semiconductor, and dielectric layer, and a metallic layer (p-D-M structure). A modification of this structure includes a heavily nnull doped region below the p region (nnull-p-D-M structure). These structures make it possible to combine high current emission with stable (durable) operation. The high current density is possible since under certain voltage drop across the dielectric layer, effective negative electron affinity is realized for the quasi-equilibrium nullcoldnull electrons accumulated in the depletion layer in the p-region next to the dielectric layer. These electrons are generated as a result of the avalanche in the p-D-M structure or injection processes in the nnull-p-D-M structure. These emitters are stable since they make use of relatively low extracting field in the vacuum region and are not affected by contamination and absorption from accelerated ions. In addition, the structures may be fabricated with current state-of-the-art technology.
Abstract:
Semiconductor device with a semiconductor cathode having an emissive part (pn junction) separated from a contact part which has locations at which a controlled breakdown occurs on a contact part metallization at excessive voltages, so that, during manufacture and operation, the emissive part in an election tube is protected from damage.
Abstract:
For use in cathodoluminescent field emission display devices, a cathode emitter can comprise an inverted field effect transistor having a diamond film or other low effective work function material deposited onto the channel layer of the transistor, such that the diamond film provides a source of primary electron emissions. A variable voltage source is applied to the gate of the transistor creating an electric field that controls the conductivity of the channel layer, thereby activating or deactivating electron emissions from this cathode emitter structure. In addition, electron blocking junctions can be incorporated into the emitter structure to inhibit current flow through the device during a deactivated state. In a variation, the transistor of the cathode emitter has the diamond film being deposited onto an electrically conductive pad that is electrically connected to, and extending outwardly from, the transistor. Alternatively, a sideways laterally gated transistor structure can be used with the emitter surface being applied to the transistor's drain. A near mono-molecular oxide film of high secondary electron emission material can also be included on the emitter surface for enhanced electron emissions.
Abstract:
For use in cathodoluminescent field emission display devices, a gated channel layer of an inverted field effect transistor functions as the electron emissive layer for a flat film surface conduction cathode emitter. In such emitters, electrons are emitted from the surface of a flat thin emissive film when an electric current is caused to flow through the film in parallel with the surface of the film. An electric field caused by a variable voltage source being applied to the gate of the transistor can control the conductivity of the channel layer, thereby controlling the level of electron emissions from the cathode emitter structure. In a variation, the field effect transistor is constructed with a two-tier structure that during operation is designed to keep conduction near the surface of the transistor. As a result, this device pushes electrons towards the exposed surface where they can then escape from the channel layer to bombard the cathodoluminescent phosphor anode. To ensure against unwanted anode currents, electron blocking junction elements can be incorporated on either side or both sides of the channel and positioned over a widened gate electrode, such that they are commonly gated along with the channel to respond to a single control voltage input to the gate electrode. Further, such emitter structures can incorporate a thin near mono-molecular film of a high secondary electron emission material on the surface of the electron emissive layer, to generally enhance the level of electron emissions from the emitter.
Abstract:
An electron source including selectively impurity doped semiconductor diamond wherein regions of selectively impurity doped regions are inverted with respect to the charge carrier population to provide a conductive path traversed by electrons subsequently emitted into a free-space region from the electron emitter. An inversion mode electron emission device including a selectively impurity doped semiconductor diamond electron emitter, for emitting electrons; a control electrode; and an anode for collecting emitted electrons wherein operation of the device relies on the inducement of an inversion region to facilitate electron transit to an electron emitting surface of the electron emitter.
Abstract:
This invention discloses an emitter for a vacuum microelectronic device. The emitter includes a heterojunction step-doped barrier comprised of a first gallium arsenide region, an aluminum gallium arsenide region adjacent the first gallium arsenide region, and a second gallium arsenide region adjacent the aluminum gallium region and opposite to the first gallium arsenide region. The first gallium arsenide region includes a layer of heavily doped n-type gallium arsenide. The aluminum gallium arsenide region includes an intrinsic layer and a heavily doped p-type layer. The second gallium arsenide region includes a heavily doped p-type layer adjacent the aluminum gallium arsenide region, an intrinsic layer and a heavily doped n-type layer adjacent a vacuum region. In addition, a graded layer between the first gallium arsenide layer region and the aluminum gallium arsenide region is provided. Ohmic contacts are fabricated on the outer surfaces of the first gallium arsenide layer and the second gallium arsenide layer. An appropriate potential is applied across the ohmic contacts such that most of the electrons from the first gallium arsenide region have enough kinetic energy to transcend the vacuum barrier potential and be emitted into the vacuum region.
Abstract:
An electron source including selectively impurity doped semiconductor diamond wherein regions of selectively impurity doped regions are inverted with respect to the charge carrier population to provide a conductive path traversed by electrons subsequently emitted into a free-space region from the electron emitter. An inversion mode electron emission device including a selectively impurity doped semiconductor diamond electron emitter, for emitting electrons; a control electrode; and an anode for collecting emitted electrons wherein operation of the device relies on the inducement of an inversion region to facilitate electron transit to an electron emitting surface of the electron emitter.