Heliotronic Forschungs- Und Entwicklungsgesellschaft Fur

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Helictronic Forschungs- Und Entwicklungs- Gesellschaft Fur

Dieter Helmreich

Erhard Sirtl

Hans-Dieter Miller

Josef Dietl

Michael Kerstan

Helmut Zauhar

Holger Lundt

Georg Priewasser

Joachim Geissler

Andreas Ehlert

Cord Gessert

Gerhard Ast

Leonhard Schmidhammer

Theo Zollner

The nondestructive detection and characterization of crystal defects in monocrystalline semiconductor material is by a combination of photoluminescence heterodyne spectroscopy, photothermal heterodyne spectroscopy and SIRD.

Method and device for nondestructive detection of crystal defects

A process and apparatus for the manufacture of silicon blocks having a columnar structure comprising monocrystalline crystal zones having a crystallographic preferred orientation. In a casting process, each mold filled with molten silicon is transferred, before the silicon has solidified completely, to a separate crystallization station where the silicon can then crystallize completely. During this process, the exposed surface of the silicon is maintained in a molten state until the end of the solidification process has almost been reached. The process allows the various, necessary steps to be carried out simultaneously and yields high-quality solar cell base material.

Process and apparatus for the cyclical manufacture of silicon shaped

The invention provides a process for the manufacture of coarsely crystalline to monocrystalline sheets and/or plates of semiconductor material of preferred orientation. A meniscus of molten semiconductor material comes in contact with a moving, cooler substrate of the same coarsely crystalline to monocrystalline semiconductor material, during which, while transferring the preferred orientation, a thin sheet of the semiconductor material is pulled onto the substrate and, after cooling, becomes detached from the substrate. The substrate can be reused as often as desired.

Process for the manufacture of coarsely crystalline to monocrystalline

Competitive current generation by the exploitation of solar energy requires cheap solar cells. A process is described which makes it possible to manufacture from silicon a base material for solar cells of this type in an economical manner and in large quantities. This is achieved by bringing silicon from a supply container into contact with a non-elemental lubricating melt, which is immiscible with silicon but will not wet silicon and has a melting point below that of silicon, and by drawing off a silicon film, sliding on this lubricating melt, and solidifying the silicon continuously by cooling to below its' melting point.

Process for making solar cell base material

To make solar energy competitive, as compared against other sources of energy, inexpensive solar cells are required. To accomplish this goal, a method is provided which enables one to produce silicon rods having a columnar structure made of monocrystalline zones with preferential crystallographic orientation. This is effected by feeding a silicon melt into a crystallization chamber having a vertically movable cooled bottom face under the influence of a temperature gradient directed parallel to the rod axis, so that the rods can be made continuously or semicontinuously with high drawing speeds.

Method for making silicon rods

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Burghausen, Germany

Dieter Helmreich