| Universitat Konstanz Patent applications |
| Patent application number | Title | Published |
|---|
| 20110162716 | DEVICE FOR FABRICATING A PHOTOVOLTAIC ELEMENT WITH STABILISED EFFICIENCY - A method and device for fabricating a photovoltaic element with stabilized efficiency is proposed. The method comprises the following steps: preparing a boron-doped, oxygen-containing silicon substrate; forming an emitter layer on a surface of the silicon substrate; and a stabilization treatment step. The stabilization treatment step comprises keeping the temperature of the substrate during a treatment time within a selectable temperature range having a lower temperature limit of 50° C., preferably 90° C., more preferably 130° C. and even more preferably 160° C. and an upper temperature limit of 230° C., preferably 210° C., more preferably 190° C. and even more preferably 180° C., and generating excess minority carriers in the silicon substrate during the treatment time, for example, by illuminating the substrate or by applying an external voltage. This method can be used to fabricate a photovoltaic element, e.g. a solar cell or a solar module having an efficiency which is stable at a value higher than that of photovoltaic elements fabricated without the stabilization treatment step. | 07-07-2011 |
| 20100243036 | Method for Fabricating a Photovolataic Element with Stabilised Efficiency - A method for fabricating a photovoltaic element with stabilised efficiency is proposed. The method comprises the following steps: preparing a boron-doped, oxygen-containing silicon substrate; forming an emitter layer on a surface of the silicon substrate; and a stabilisation treatment step. The stabilisation treatment step comprises keeping the temperature of the substrate during a treatment time within a selectable temperature range having a lower temperature limit of 50° C., preferably 90° C., more preferably 130° C. and even more preferably 160° C. and an upper temperature limit of 230° C., preferably 210° C., more preferably 190° C. and even more preferably 180° C., and generating excess minority carriers in the silicon substrate during the treatment time, for example, by illuminating the substrate or by applying an external voltage. This method can be used to fabricate a photovoltaic element, e.g. a solar cell or a solar module having an efficiency which is stable at a value higher than that of photovoltaic elements fabricated without the stabilisation treatment step. | 09-30-2010 |
| 20100218826 | METHOD FOR PRODUCING A SILICON SOLAR CELL WITH A BACK-ETCHED EMITTER AS WELL AS A CORRESPONDING SOLAR CELL - A method is presented for producing a silicon solar cell with a back-etched emitter preferably with a selective emitter and a corresponding solar cell. According to one aspect, the method comprises the following method steps: producing a two-dimensionally extending emitter at an emitter surface of a solar cell substrate; applying an etching barrier onto first partial zones of the emitter surface; etching the emitter surface in second partial zones of the emitter surface not covered by the etching barrier; removing the etching barrier; and producing metal contacts at the first partial zones. During the method, especially during the etching of the emitter surface in the second partial zones, a porous silicon layer is advantageously produced, which is then oxidised. This oxidised porous silicon layer can subsequently be etched away together with any phosphorus glass that may be present. The method makes use of conventional screen-printing and etching technologies and is thus compatible with current industrial production plants. | 09-02-2010 |
| 20090246969 | METHOD FOR TEXTURING SILICON WAFERS FOR PRODUCING SOLAR CELLS - In a method for texturing silicon wafers for producing solar cells, the step of introducing a silicon wafer involves the use of a texturing solution which is at a temperature of at least 80 degrees Celsius and which comprises water admixed with 1 percent by weight to 6 percent by weight KOH or 2 percent by weight to 8 percent by weight NaOH and with a surfactant or a surfactant mixture constituting less than 0.01 percent by weight. Very economic texturing can be performed in this way. | 10-01-2009 |
| 20090157655 | Process For Computer Supported Processing of Course Data Elements, System and Computer Program Product - In summary, the present invention concerns processes for computer supported processing of source data elements ( | 06-18-2009 |
| 20080251123 | METHOD FOR PRODUCING A SOLAR CELL AND A SOLAR CELL PRODUCED ACCORDING TO SAID METHOD - The problem posed by both conventional and novel crystalline silicon solar cells is the electrical isolation of layers doped with p and n conductivity types. The invention solves said problem in a simple and elegant manner. A masking paste is applied locally to at least one side of the silicon substrate and is subsequently dried. A doping material diffusion is then carried out, whereby the conductivity type of the doping material is in opposition to that of the base doping of the crystalline silicon substrate. In one of the subsequent production steps of the solar cell, the electric contacts are applied in such a way that at least one section of said contacts is isolated electrically from the rest of the contact by the masking paste. The masking paste thus allows an electrical isolation of the two external contacts of a solar cell by preventing the diffusion of one doping material using said paste. Other methods that achieve the same results are substantially more complex and expensive to use. | 10-16-2008 |
