Patent application number | Description | Published |
20080311342 | Silicon wafer having good intrinsic getterability and method for its production - Silicon wafers in the entire volume of which crystal lattice vacancies are the prevalent point defect type, have a rotationally symmetric region whose width is at least 80% of the wafer radius, crystal lattice vacancy agglomerates of at least 30 nm in a density ≦6·10 | 12-18-2008 |
20100059861 | SEMICONDUCTOR WAFER COMPOSED OF MONOCRYSTALLINE SILICON AND METHOD FOR PRODUCING ITo - Semiconductor wafers composed of monocrystalline silicon and doped with nitrogen contain an OSF region and a PV region, wherein the OSF region extends from the center radially toward the edge of the wafer as far as the P | 03-11-2010 |
20110084366 | Epitaxial Wafer and Production Method Thereof - The epitaxial layer defects generated from voids of a silicon substrate wafer containing added hydrogen are suppressed by a method for producing an epitaxial wafer by: | 04-14-2011 |
20110195251 | Method For Pulling A Single Crystal Composed Of Silicon From A Melt Contained In A Crucible, and Single Crystal Produced Thereby - Silicon single crystals are pulled from a melt in a crucible, the single crystal surrounded by a heat shield, the lower end of which is a distance h from the melt surface, wherein gas flows downward between the single crystal and the heat shield, outward between the lower end of the heat shield and the melt, and then upward in the region outside the heat shield. The internal diameter of the heat shield at its lower end is 55 mm or more than the diameter of the single crystal, and the radial width of the heat shield at its lower end is not more than 20% of the diameter of the single crystal. Highly doped single crystals pulled accordingly have a void concentration ≦50 m | 08-11-2011 |
20110304081 | Method For Producing Semiconductor Wafers Composed Of Silicon - Silicon semiconductor wafers are produced by pulling a single crystal at a seed crystal from a melt heated in a crucible; supplying heat to the center of the crucible bottom with a heating power which, in the course of the growth of a cylindrical section of the single crystal, is increased at least once to not less than 2 kW and is then decreased again; and slicing semiconductor wafers from the pulled single crystal. | 12-15-2011 |
20110316128 | Semiconductor Wafers Of Silicon and Method For Their Production - Semiconductor wafers of silicon are produced by pulling a single crystal growing on a phase boundary from a melt contained in a crucible and cutting of semiconductor wafers therefrom, wherein during pulling of the single crystal, heat is delivered to a center of the phase boundary and a radial profile of a ratio V/G from the center to an edge of the phase boundary is controlled, G being the temperature gradient perpendicular to the phase boundary and V being the pull rate. The radial profile of the ratio V/G is controlled so that the effect of thermomechanical stress in the single crystal adjoining the phase boundary, is compensated with respect to creation of intrinsic point defects. The invention also relates to defect-free semiconductor wafers of silicon, which can be produced economically by this method. | 12-29-2011 |
20130295408 | POLYCRYSTALLINE SILICON ROD AND PROCESS FOR PRODUCTION THEREOF - The invention provides a polycrystalline silicon rod having a total diameter of at least 150 mm, including a core A having a porosity of 0 to less than 0.01 around a thin rod, and at least two subsequent regions B and C which differ in porosity by a factor of 1.7 to 23, the outer region C being less porous than region B. | 11-07-2013 |
Patent application number | Description | Published |
20090081802 | METHOD FOR ENRICHING SHORT-CHAIN NUCLEIC ACIDS - The present invention relates to a method for enriching nucleic acids with a length of not more than 300 nucleotides | 03-26-2009 |
20090306177 | Modulation of Immunostimulatory Properties of Short Interfering Ribonucleic Acid (Sirna) by Nucleotide Modification - Double-stranded short interfering ribonucleic acid (siRNA) are modified to reduce or eliminate their immunostimulatory effect without significantly affecting their gene silencing effect. Modified siRNA include one or more 2′ sugar modifications and, optionally, internucleotide linkages on the sense strand. Compositions containing the modified siRNA and methods of making and using the modified siRNA are disclosed. New and previously characterized siRNA can be synthesized to incorporate modifications according to the invention. | 12-10-2009 |
20090317906 | GENE SILENCING USING SENSE DNA AND ANTISENSE RNA HYBRID CONSTRUCTS COUPLED TO PEPTIDES FACILITATING THE UPTAKE INTO CELLS - The present invention generally relates to gene silencing using sense DNA (sDNA)-antisense RNA (aRNA) hybrids wherein the sense DNA strand is coupled to a peptide which facilitates the uptake of the hybrid into cells. | 12-24-2009 |
20100021925 | Isolation of nucleic acids on surfaces - New processes and equipment to isolate and purify nucleic acids on surfaces are provided. The invention focuses on processes which use surfaces, for example, porous membranes, on which the nucleic acids are immobilized in a simple manner from the sample containing the nucleic acids and can be released again by way of simple procedural steps, whereby the simple performance of the process according to the invention makes it possible to perform the processes specifically in a fully automatic manner. An additional aspect of the present invention focuses on binding the nucleic acids to an immobile phase, especially to a membrane, in such a way and manner, that they can be released without difficulty during an additional reaction stage from this phase and, if desired, can be used in other applications, such as restriction digestion, RT, PCR or RT-PCR, or in any of the suitable analyses or enzyme reactions mentioned in the disclosure. Special isolation devices are provided that can be used to carry out the processes according to the invention. | 01-28-2010 |
20100159460 | Isolation of nucleic acids on surfaces - New processes and equipment to isolate and purify nucleic acids on surfaces are provided. The invention focuses on processes which use surfaces, for example, porous membranes, on which the nucleic acids are immobilized in a simple manner from the sample containing the nucleic acids and can be released again by way of simple procedural steps, whereby the simple performance of the process according to the invention makes it possible to perform the processes specifically in a fully automatic manner. An additional aspect of the present invention focuses on binding the nucleic acids to an immobile phase, especially to a membrane, in such a way and manner, that they can be released without difficulty during an additional reaction stage from this phase and, if desired, can be used in other applications, such as restriction digestion, RT, PCR or RT-PCR, or in any of the suitable analyses or enzyme reactions mentioned in the disclosure. Special isolation devices are provided that can be used to carry out the processes according to the invention. | 06-24-2010 |