Abstract: A solar cell receiver is provided that includes a semiconductor element that has a front face, a solar cell provided on the front face, a rear face, multiple lateral surfaces and two electric connectors; a carrier for receiving the semiconductor element, the rear face of the element being fixed to the carrier; and an optical element for concentrating the light onto the rear face of the semiconductor element. The optical element has an underside which partially faces the upper side of the semiconductor element, the underside of the optical element has a first shaped section with a first surface that lies on the front face of the semiconductor element and a second surface that lies on the carrier. The shaped section is designed as a cavity or groove.

Abstract: The invention relates to a photovoltaic assembly (10) comprising a support substrate (12) consisting of silicon, a solar cell (26), in particular a solar concentrator cell, said cell having a first and a second solar cell contact (28, 30) and being connected to the upper face (38) of the support substrate (12) by means of the first solar cell contact (28), a pn-junction (46) that is integrated into the support substrate (12) in order to form a protective diode (14) comprising a first protective diode contact (16) and a second protective diode contact (20), said diodes being connected in anti-parallel to the solar cell (26). In order to design the contacts of the protective diode with as large a surface area as possible and to permit a simple contacting of the solar cell, the first and second protective diode contact (16, 20) form a first and second surface area (18, 22) respectively of the upper face (38) of the support substrate (12).

Abstract: A solar cell receiver is provided that includes a semiconductor element that has a front face, a solar cell provided on the front face, a rear face, multiple lateral surfaces and two electric connectors; a carrier for receiving the semiconductor element, the rear face of the element being fixed to the carrier; and an optical element for concentrating the light onto the rear face of the semiconductor element. The optical element has an underside which partially faces the upper side of the semiconductor element, the underside of the optical element has a first shaped section with a first surface that lies on the front face of the semiconductor element and a second surface that lies on the carrier. The shaped section is designed as a cavity or groove.

Abstract: Aluminum oxide powder in the form of aggregates of primary-particles, which has a BET surface area of from 10 to 90 m2/g and comprises as crystalline phases, in addition to gamma-aluminum oxide and/or theta-aluminum oxide, at least 30% of delta-aluminum oxide. It is prepared by vaporizing aluminum chloride and burning the vapor together with hydrogen and air, the ratio of primary air/secondary air being 0.01 to 2, the exit speed vB of the reaction mixture from the burner being at least 10 m/s, the lambda value being 1 to 4, the gamma value being 1 to 3 and the value of gamma*vB/lambda being greater than or equal to 55. Dispersion comprising the aluminum oxide powder. Coating composition comprising the dispersion.

Abstract: Aluminium oxide powder produced by flame hydrolysis and consisting of aggregates of primary particles, having a BET surface area of from 100 to 250 m2/g, a dibutyl phthalate absorption of from 50 to 450 g/100 g of aluminium oxide powder, which powder shows only crystalline primary particles in high-resolution TEM pictures.

Abstract: Titanium-aluminium mixed oxide powder with a proportion of aluminium oxide of less than 1 wt. % or a proportion of titanium dioxide of less than 5 wt. %, wherein the sum of the proportions of titanium dioxide and aluminium oxide is at least 99.7 wt. %. It is produced by transferring a vaporous starting compound of the quantitatively greater component of the mixed oxide into a mixing chamber by means of primary air and a vaporous starting compound of the quantitatively smaller component of the mixed oxide by means of an inert gas, and burning the mixture mixed with hydrogen in a mixing chamber into a reaction chamber. It can be used as a catalyst support.

Abstract: Aluminium oxide powder in the form of aggregates of primary- particles, which has a BET surface area of from 10 to 90 m2/g and comprises as crystalline phases, in addition to gamma- aluminium oxide and/or theta-aluminium oxide, at least 30% of delta-aluminium oxide. It is prepared by vaporizing aluminium chloride and burning the vapour together with hydrogen and air, the ratio of primary air/secondary air being 0.01 to 2, the exit speed vB of the reaction mixture from the burner being at least 10 m/s, the lambda value being 1 to 4, the gamma value being 1 to 3 and the value of gamma * vB/lambda being greater than or equal to 55. Dispersion comprising the aluminium oxide powder. Coating composition comprising the dispersion.

Abstract: Pyrogenically produced silicon dioxide powder in the form of aggregates of primary particles having a BET surface area of 200±25 m2/g, wherein the aggregates display an average surface area of 7000 to 12000 nm2, an average equivalent circle diameter (ECD) of 80 to 100 nm and an average circumference of 850 to 1050 nm. It is produced by a pyrogenic process in which silicon tetrachloride and a second silicon component comprising H3SiCl, H2SiCl2, HSiCl3, CH3SiCl3, (CH3)2SiCl2, (CH3)3SiCl and/or (n-C3H7)SiCl3 are mixed with primary air and a combustion gas and burnt into a reaction chamber, secondary air also being introduced into the reaction chamber, and the feed materials being chosen such that an adiabatic flame temperature of 1570 to 1630° C. is obtained. It can be used as a filler.

Abstract: Process for preparing pulverulent solids, in which one or more oxidizable and/or hydrolysable metal compounds are reacted in a high-temperature zone in the presence of oxygen and/or steam, the reaction mixture is cooled after the reaction, and the pulverulent solid is removed from gaseous substances, wherein at least one metal compound is introduced into the high-temperature zone in solid form and the evaporation temperature of the metal compound is below the temperature of the high-temperature zone.

Abstract: Titanium-aluminium mixed oxide powder with a proportion of aluminium oxide of less than 1 wt. % or a proportion of titanium dioxide of less than 5 wt. %, wherein the sum of the proportions of titanium dioxide and aluminium oxide is at least 99.7 wt. %. It is produced by transferring a vaporous starting compound of the quantitatively greater component of the mixed oxide into a mixing chamber by means of primary air and a vaporous starting compound of the quantitatively smaller component of the mixed oxide by means of an inert gas, and burning the mixture mixed with hydrogen in a mixing chamber into a reaction chamber. It can be used as a catalyst support.

Abstract: Aluminium oxide powder produced by flame hydrolysis and consisting of aggregates of primary particles, having a BET surface area of from 100 to 250 m2/g, a dibutyl phthalate absorption of from 50 to 450 g/100 g of aluminium oxide powder, which powder shows only crystalline primary particles in high-resolution TEM pictures.

Abstract: Pyrogenically produced silicon dioxide powder in the form of aggregates of primary particles having a BET surface area of 200±25 m2/g, wherein the aggregates display an average surface area of 7000 to 12000 nm2, an average equivalent circle diameter (ECD) of 80 to 100 nm and an average circumference of 850 to 1050 nm. It is produced by a pyrogenic process in which silicon tetrachloride and a second silicon component comprising H3SiCl, H2SiCl2, HSiCl3, CH3SiCl3, (CH3)2SiCl2, (CH3)3SiCl and/or (n-C3H7)SiCl3 are mixed with primary air and a combustion gas and burnt into a reaction chamber, secondary air also being introduced into the reaction chamber, and the feed materials being chosen such that an adiabatic flame temperature of 1570 to 1630° C. is obtained. It can be used as a filler.

Abstract: Pyrogenically produced oxides of metals and/or metalloids doped with erbium oxide, in which the base component is a pyrogenically produced oxide doped with erbium oxide in an amount of 0.000001 to 40 wt %, in which the BET surface of the doped oxide lies between 1 and 1000 m2/g, are produced by feeding an aerosol into a flame, as used for production of pyrogenic oxide, in which an erbium salt solution is used as the starting product for the aerosol, the aerosol being produced by atomization with an aerosol generator, this aerosol is mixed homogeneously before reaction with a gas mixture for flame oxidation or flame hydrolysis, the aerosol-gas mixture is then allowed to react in a flame, and the formed pyrogenic oxides doped with erbium oxide are separated from the gas stream in a known fashion. The pyrogenic oxide of metals and/or metalloids doped with erbium oxide can be used as glass raw material.

Abstract: The invention relates to a solar cell which consists of a doped semiconductor base body and metallic connection contacts on the front and rear sides. For interconnection with further solar cells to form solar modules in series or parallel connection, at least one of the connection contacts comprises a connector contact which is homogeneously integrated with it, protrudes from the semiconductor base body and is deformable.

Abstract: A space solar cell comprising a doped semiconductor basic element and metallic contacts on the front and rear, and a cover glass with contacts. To draw off the electrostatic charge generated on the surface of the cover glass of the solar cell, either a part of a connector contact homogeneously integrated with the contacts and projecting from the semiconductor element extends in a shapeable manner onto the cover glass of the solar cell, or a connector contact homogeneously integrated with the contact of the cover glass and projecting from the cover glass is connected to an electric contact of the solar cell.

Abstract: The invention relates to a solar generator comprising separate and spaced semiconductor solar cells having surfaces provided for light incidence and electrically interconnected connection contacts for the surfaces and opposite rear faces, and having separate surface coverings for the various solar cells. The surface coverings here are so designed that the spaces between adjacent solar cells in which the connection contacts are located are each covered by a bridge.