Abstract: A concentrator arrangement (10) consists of a plate (11) to which there is coupled a plurality of first stages (14) with parabolic side walls (2, 3) arranged parallel to one another. The first stages (14) are optically coupled with second stages (15) whose coupling surfaces with the first stages (14) and whose coupling surfaces with the solar cells (21) are square. The side walls as well as the front and rear walls of the second stages (15) are parabolically curved.

Abstract: A solar powered electronic clock has a display, time-keeping electronics, a battery, and a solar cell array. The battery is chargeable from the solar cell array and supplies only the time-keeping electronics while the display is powered only by the solar cell array. A diode connected between the solar cell array and battery permits the battery to be recharged, but prevents the display from drawing energy from the battery.

Abstract: A row of strip-shaped semiconductor junctions is arranged on each of the two surfaces of a semiconductor substrate possessing a high ohmic resistance, these junctions having p.sup.+ - and n.sup.+ -conduction characteristics in alternation and being parallel to each other and spaced at intervals, in such a way that a semiconductor junction having a p.sup.+ -conduction characteristic on one surface of the semiconductor substrate is, in each case, located opposite a semiconductor junction having an n.sup.+ -conduction characteristic on the other surface, and printed circuit tracks are arranged, in alternation, on one surface and on the other surface of the semiconductor substrate, these tracks connecting, in each case, one series of solar cell junctions with a neighboring series, in series-connection.

Abstract: The present invention provides an apparatus in which one or more light concentrators comprising thin layers of transparent solid or liquid materials with embedded fluorescent centers are combined with absorbers in order to convert solar light into heat energy at high temperatures.

Abstract: An apparatus for the conversion of light energy into electrical energy, by hich solar energy may be converted into electrical energy effectively and cheaply. The invention further relates to fluorescent centers (light concentrators) which consist of thin layers of transparent solid or liquid materials with embedded fluorescent centers and which in conjunction with solar cells serve to convert solar energy into electrical energy.

Abstract: A method of setting the lifetime of charge carriers in a semiconductor body by the formation of recombination centers in the semiconductor body. The quantity of the recombination centers forming material necessary to provide the desired concentration in the semiconductor body is applied to the surface of the semiconductor body and into the surface thereof by ion implantation, and thereafter, in order to diffuse the material into the semiconductor body, the body is heated until an approximately stationary value for the charge carrier lifetime has developed in the entire volume of the body.