초록 ▼

Edge termination for a silicon carbide Schottky rectifier is provided by including a silicon carbide epitaxial region on a voltage blocking layer of the Schottky rectifier and adjacent a Schottky contact of the silicon carbide Schottky rectifier. The silicon carbide epitaxial layer may have a thickn

Edge termination for a silicon carbide Schottky rectifier is provided by including a silicon carbide epitaxial region on a voltage blocking layer of the Schottky rectifier and adjacent a Schottky contact of the silicon carbide Schottky rectifier. The silicon carbide epitaxial layer may have a thickness and a doping level so as to provide a charge in the silicon carbide epitaxial region based on the surface doping of the blocking layer. The silicon carbide epitaxial region may form a non-ohmic contact with the Schottky contact. The silicon carbide epitaxial region may have a width of from about 1.5 to about 5 times the thickness of the blocking layer. Schottky rectifiers with such edge termination and methods of fabricating such edge termination and such rectifiers are also provided. Such methods may also advantageously improve the performance of the resulting devices and may simplify the fabrication process.

대표청구항 ▼

Edge termination for a silicon carbide Schottky rectifier is provided by including a silicon carbide epitaxial region on a voltage blocking layer of the Schottky rectifier and adjacent a Schottky contact of the silicon carbide Schottky rectifier. The silicon carbide epitaxial layer may have a thickn

Edge termination for a silicon carbide Schottky rectifier is provided by including a silicon carbide epitaxial region on a voltage blocking layer of the Schottky rectifier and adjacent a Schottky contact of the silicon carbide Schottky rectifier. The silicon carbide epitaxial layer may have a thickness and a doping level so as to provide a charge in the silicon carbide epitaxial region based on the surface doping of the blocking layer. The silicon carbide epitaxial region may form a non-ohmic contact with the Schottky contact. The silicon carbide epitaxial region may have a width of from about 1.5 to about 5 times the thickness of the blocking layer. Schottky rectifiers with such edge termination and methods of fabricating such edge termination and such rectifiers are also provided. Such methods may also advantageously improve the performance of the resulting devices and may simplify the fabrication process. The device according to claim 1, wherein the test reagents comprise at least one detection reagent that is capable of reacting with a predetermined analyte to provide a detectable effect. 9. The device according to claim 1 which is suitable for conducting immunoassays wherein the test reagents comprise an antigen of diagnostics significance or an antibody therefor. 10. The device according to claim 1 in which the test reagents comprise: (a) a labelled analyte or analyte analogue or a labelled specific binding reagent for an analyte, the labelled specific binding reagent or labelled analyte or analyte analogue being freely mobile when a liquid sample in whose presence the analyte is suspected is applied to the porous material; and (b) an unlabelled specific binding reagent for the same analyte immobilised on the porous material in a detection zone, the relative positioning of the labelled reagent (a) and the detection zone being such that when the liquid sample is applied to the bibulous compartment, the labelled reagent (a) permeates into the detection zone. 11. The device according to claim 10 in which the reagent (a) is provided on a part of the porous material which is not coated with the polymer (b), in such a way as to be chromatographically transported into the bibulous compartment when a liquid sample is applied to the assay device. 12. The device according to claim 1 suitable for use in a quantitative or semi-quantitative assay or for use in an assay of a liquid sample for a plurality of predetermined analytes, in which the bibulous compartment comprises a central body and a plurality of channels connected thereto. 13. A method of assaying a liquid sample for the presence or absence of a predetermined analyte, which method comprises: (a) contacting the liquid sample with the bibulous compartment of a device according to claim 1; (b) allowing the porous material to transport chromatographically the liquid sample; and (c) determining the presence of the predetermined analyte in the liquid sample. 14. A test-kit containing a device according to claim 1. 15. A process for preparing an assay device according to claim 1, which process comprises: (a) providing a porous material capable of chromatographically transporting a liquid; (b) providing one or more test reagents for an assay on the porous material; and (c) attaching a transparent, water-impermeable coating polymer to the thus-obtained material by contacting the material with a solution or suspension of the coating polymer such that the coating polymer penetrates from 30% to 70% of the thickness of the thus-obtained material. 16. The process according to claim 15 further comprising the additional step, between steps (a) and (b), of applying a doping polymer impermeable to the liquid which the porous material is capable of transporting, to part of the porous material, so as to define a channel in the porous material, the or each test reagent being provided on the porous support in step (b) in the channel defined therein. 17. The process according to claim 15 further comprising: (d) contacting the thus obtained device with one or more compound selected from acrylic polymers, gelling polysaccharides and polyvinyl alcohols to form a transparent glossy layer on the device. ; and (D) while the bead is retained in the bead holder, screening the molecules located on the first section of the at least one bead of the library; and (E) while the bead is retained in the bead holder, characterizing the molecules located on the second section of the at least one bead of the library. 2. The method of claim 1, wherein the at least one bead comprises polystyrene. 3. The method of claim 1, wherein the library comprises a first bead coated with molecules and a second bead coated with molecules, wherein the molecules on said bead have a different chemical structure than those on said first bead. 4. The method of claim 1, wherein the molecules coating the at least one bead are peptides having the same chemical structure. 5. The method of claim 1, wherein the bead holder is a plate which includes holes to retain the beads. 6. The method of claim 5, wherein the at least one bead is loaded into the bead holder using a fluid stream to force the at least one bead into the holes. 7. The method of claim 1, wherein the screening of the molecules located on the first section of the at least one bead does not interfere with the characterization of the molecules located on the second section of the least one bead. 8. The method of claim 1, wherein the characterization of the molecules located on the second section of the at least one bead is performed by Time-of-Flight/Secondary Ion Mass Spectrometry. 9. The method of claim 1, wherein a computer controls the simultaneous screening and characterization of the molecules located on the first and second sections of the at least one bead.