Abstract:
A zinc oxide crystal growth substrate is disclosed. The zinc oxide crystal growth substrate includes a thin layer of single crystal zinc oxide deposited on an self supporting substrate surface by a chemical deposition process. The chemical deposition process is selected from RF sputtering, CVD (chemical vapor deposition), MOCVD (metal organic chemical vapor deposition), spin coating, electrophoresis, and hydrothermal growth processes. The self supporting substrate may be amorphous, polycrystalline, or crystalline. The thin layer of zinc oxide has a crystal lattice which permits the crystal growth of a crystal compatible with zinc oxide. The compatible crystal has a lattice parameter within about 5% of a corresponding lattice parameter of the zinc oxide.
Abstract:
Semiconductor devices containing group II-VI semiconductor materials are disclosed. The devices may include a p-n junction containing a p-type group II-VI semiconductor material and an n-type semiconductor material. The p-type group II-VI semiconductor includes a single crystal group II-VI semiconductor containing atoms of group II elements, atoms of group VI elements, and one or more p-type dopants. The p-type dopant concentration is greater than about 10 16 atoms cm -3 , the semiconductor resistivity is less than about 0.5 ohm- cm, and the carrier mobility is greater than about 0.1 cm 2 /V.s. The semiconductor devices may include light emitting diodes, laser diodes, field effect transistors, and photodetectors.
Abstract:
Electroluminescent materials and devices which emit non-thermal light in response to an electric field are disclosed. The electroluminescent materials are based upon a multicomponent ceramic oxide host compound and one or more metal oxide dopant compounds which form a solid solution with the ceramic oxide host compound. The dopant is present in the host at an amount in the range from about 0.002 mole % to 0.1 mole %. In the electroluminescent devices, a layer of electroluminescent material is disposed between a transparent conductive oxide layer and a ground plane. An electric field generator is electrically connected to the conductive oxide layer and the ground plane for generating an electric field. The layer of electroluminescent material is coated with at least one barrier layer, and preferably a pair of barrier layers, to inhibit chemical reaction of the electroluminescent material. The electroluminescent devices preferably include a dielectric layer.
Abstract:
Semiconductor devices containing group II-VI semiconductor materials are disclosed. The devices may include a p-n junction (50) containing a p-type (52) group II-VI semiconductor material and an n-type semiconductor material. The p-type group II-VI semiconductor includes a single crystal group II-VI semiconductor containing atoms of group II elements, atoms of group VI elements, and one or more p-type dopants. The p-type dopant concentration is greater than about 1016 atoms'cm-3,the semiconductor resistivity is less than about 0.5 ohm.cm, and the carrier mobility is greater than about 0.1 cm//V-s. The semiconductor devices may include light emitting diodes, laser diodes, field effect transistors, and photodetectors.
Abstract:
Electroluminescent materials and devices which emit non-thermal light in response to an electric field are disclosed. The electroluminescent materials are based upon a multicomponent ceramic oxide host compound and one or more metal oxide dopant compounds which form a solid solution with the ceramic oxide host compound. The dopant is present in the host at an amount in the range from about 0.002 mole % to 0.1 mole %. In the electroluminescent devices, a layer of electroluminescent material (12, 32) is disposed between a transparent conductive oxide layer (14, 34) and a ground plane (16, 36). An electric field generator (18, 38) is electrically connected to the conductive oxide layer (14, 34) and the ground plane (16, 36) for generating an electric field. The layer of electroluminescent material (12, 32) is coated with at least one barrier layer (20, 40), and preferably a pair of barrier layers, to inhibit chemical reaction of the electroluminescent material. The electroluminescent devices preferable include a dielectric layer (42).
Abstract:
Low dielectric constant group II-VI compounds, such as zinc oxide, and fabrication methods are disclosed. Low dielectric constant insulator materials are fabricated by doping zinc oxide with at least one mole % p-type dopant ion. Low dielectric constant zinc oxide insulator materials are fabricated by doping zinc oxide with silicon having a concentration of at least 1017 atoms/cm3. Low dielectric zinc oxide insulator materials are fabricated by doping zinc oxide with a dopant ion having a concentration of at least about 1018 atoms/cm3, followed by heating to a temperature which converts the zinc oxide to an insulator. The temperature varies depending upon the choice of dopant. For arsenic, the temperature is at least about 450°C; for antimony, the temperature is at least about 650°C. The dielectric constant of zinc oxide semiconductor is lowered by doping zinc oxide with a dopant ion at a concentration at least about 1018 to about 1019 atoms/cm3.
Abstract:
A persistent p-type group II-VI semiconductor material is disclosed. The group II-VI semiconductor includes atoms of group 11 elements, atoms of group VI elements, and one or more p-type dopants. The p-type dopant concentration is sufficient to render the group II-VI semiconductor material in a single crystal form. The semiconductor resistivity is less than about 0.5 ohm-cm, and the carrier mobility is greater than about 0.1 CM /V⋅s. Group II elements include zinc, cadmium, the alkaline earth metals such as beryllium, magnesium calcium, strontium, and barium, and mixtures thereof Group VI elements include oxygen, sulfur, selenium, tellurium, and mixtures thereof. P-type dopants include, but are not limited to, nitrogen, phosphorus, arsenic, antimony, bismuth, copper, chalcogenides of the foregoing, and mixtures thereof.
Abstract:
A persistent p-type group II-VI semiconductor material is disclosed. The group II-VI semiconductor includes atoms of group 11 elements, atoms of group VI elements, and one or more p-type dopants. The p-type dopant concentration is sufficient to render the group II-VI semiconductor material in a single crystal form. The semiconductor resistivity is less than about 0.5 ohm-cm, and the carrier mobility is greater than about 0.1 CM 2 /V⋅s. Group II elements include zinc, cadmium, the alkaline earth metals such as beryllium, magnesium calcium, strontium, and barium, and mixtures thereof Group VI elements include oxygen, sulfur, selenium, tellurium, and mixtures thereof. P-type dopants include, but are not limited to, nitrogen, phosphorus, arsenic, antimony, bismuth, copper, chalcogenides of the foregoing, and mixtures thereof.
Abstract:
A zinc oxide crystal growth substrate is disclosed. The zinc oxide crystal growth substrate includes a thin layer of single crystal zinc oxide deposited on an self supporting substrate surface by a chemical deposition process. The chemical deposition process is selected from RF sputtering, CVD (chemical vapor deposition), MOCVD (metal organic chemical vapor deposition), spin coating, electrophoresis, and hydrothermal growth processes. The self supporting substrate may be amorphous, polycrystalline, or crystalline. The thin layer of zinc oxide has a crystal lattice which permits the crystal growth of a crystal compatible with zinc oxide. The compatible crystal has a lattice parameter within about 5% of a corresponding lattice parameter of the zinc oxide.
Abstract:
Up-conversion and down-conversion photo-luminescence in rare earth compounds are disclosed. Broadband, super-radiant, and discrete line emissions are observed. The rare earth compounds include a rare earth element and at least one other element selected from chalcogens, halogens, nitrogen, and phosphorus. The rare earth compounds include, but are not limited to, rare earth oxides, fluorides, and oxyfluorides. Doping and co-doping of rare earth compounds in an optical host material is not required. The compounds are irradiated with incident light having an incident wavelength that is selected to be highly absorbed by the rare earth compound. The up-conversion and down-conversion luminescence have been observed which may be caused by unknown electron transitions, particularly in the case of ytterbia.