Abstract:
The present application describes a process and apparatus for producing polycrystalline silicon ingots. During the process, a crucible is arranged in a process chamber, wherein the crucible is filled with solid silicon material or is being filled with silicon material in the process chamber. The crucible is located with respect to at least one diagonal heater in such a way that the diagonal heater is located laterally offset to and generally above the silicon ingot to be produced. Thereafter, the solid silicon material in the crucible is heated above the melting temperature of the silicon material in order to form molten silicon in the crucible, and thereafter, the silicon material in the crucible is cooled down below the solidification temperature of the molten silicon, therein a temperature profile in the silicon material during the cooling phase is controlled at least partially via the at least one diagonal heater. The apparatus comprises a process chamber, a crucible holder inside the process chamber, and at least one diagonal heater in the process chamber. The diagonal heater is located laterally with respect to the crucible holder and extends generally perpendicular thereto and is spaced from the crucible holder in a vertical direction at such a distance that the diagonal heater is located generally above a polycrystalline silicon ingot to be formed in the crucible. The diagonal heater is stationary with respect to the crucible holder when the process chamber is closed.
Abstract:
An apparatus and a method for applying a voltage across a plurality of silicon rods (51-54) in a CVD reactor and a CVD reactor are described. The apparatus has a series connection in which the silicon rods may be inserted as resistors, at least one first power supply unit (12), at least one second power supply unit (14), at least one third power supply unit (16), and at least one control unit which is capable of applying a voltage across the silicon rods in the series connection via the first, the second or the third power supply unit. The first power supply unit has a plurality of first transformers (21-24), the outputs of which are each connected with one silicon rod in the series connection and wherein the first transformers have a first open circuit voltage and a first short circuit current. The second power supply unit has a plurality of second transformers (31-32), the outputs of which are connected to the same number of silicon rods as the first transformers in the series connection, in parallel to one or more of the first transformers and wherein the second transformers have a second open circuit voltage and a second short circuit current, wherein the second open circuit voltage is lower than the first open circuit voltage and the second short circuit current is higher than the first short circuit current. The third power supply unit has outputs which are connected with the silicon rods in the series connection in parallel to the first and second transformers and wherein the third power supply unit is capable of providing a current in a voltage range which is below the open circuit voltage of the second transformer, which current is higher than the short circuit current of the second transformer.
Abstract:
Verfahren zur Hydrierung von Chlorsilanen, bei welchem ein Gasgemisch (50) aufweisend ein zu hydrierendes Chlorsilangas und Wasserstoffgas in einem Reaktor (3a, 3b, 3c; 13a; 23a) auf Temperaturen im Bereich zwischen 500 °C und 1800 °C erhitzt und in dieser Weise das Chlorsilangas wenigstens zum Teil hydriert wird und bei welchem zum Zwecke des Erhitzens des Gasgemisches (50) der Reaktor (3a, 3b, 3c; 13a; 23a) mittels wenigstens einer Flamme erhitzt wird, welche in einer Umgebung des Reaktors (3a, 3b, 3c; 13a; 23a) angeordnet wird, sowie Konverter (1) zur Durchführung des Verfahrens.
Abstract:
The invention relates to an arrangement for measurement of the temperature and of the thickness growth of silicon rods in a silicon deposition reactor, by means of a pyrometer which is located outside the reactor. The aim of the invention is to provide an arrangement which allows continuous temperature measurement and measurement of the thickness growth throughout the entire deposition process, with adequate accuracy. This is achieved in that a contactlessly operating temperature measurement device (4) is provided for the temperature measurement and is arranged outside the silicon deposition reactor in front of a viewing window (2), in that the temperature measurement device (4) can be pivoted horizontally about a rotation axis (5) by means of a rotating drive (9), wherein the pivoting axis (5) runs parallel to the longitudinal axis of the silicon rod (1), and wherein the centre axis (6) of the temperature measurement device runs through the pivoting axis (5).
Abstract:
Der Erfindung, welche ein Verfahren zur Stromversorgung eines CVD-Prozesses bei der Siliziumabscheidung betrifft, liegt die Aufgabe zugrunde, bei deutlich verringertem Aufwand unter Vermeidung der aufwändigen Parallel-/Seriell-Umschaltung eine schnelle und effektive Aufheizung der Stabpaare zu gewährleisten. Diese Aufgabe wird dadurch gelöst, dass die Stabpaare in einer elektrischen Reihenschaltung geschaltet werden und dass jedes Stabpaar durch ein Mittel zum elektrischen überbrücken des Stabpaares zumindest teilweise überbrückbar ist und dass an mindestens einem Stabpaar die angelegte elektrische Spannung anliegt.