| 20090217875 | APPARATUS FOR THE HEAT TREATMENT OF DISC SHAPED SUBSTRATES - The application relates to an apparatus for the heat treatment of disc shaped substrates, in particular semi-conductor wafers. The apparatus has at least one radiation source and a treatment chamber accommodating the substrate having an upper wall element and a lower wall element, at least one of the wall elements lying adjacent to the at least one radiation source and being substantially transparent for the radiation from the radiation source. Furthermore, the apparatus makes provision for at least a first gas inlet apparatus. The first gas inlet apparatus has a plate element which is disposed within the treatment chamber between the substrate and the upper wall element, a collar ring disposed between the plate element and the upper wall element, and a first gas conveyance duct extending at least partially within the treatment chamber. The plate element has a larger diameter than the substrate and in a hole region approximately corresponding to the diameter of the substrate a plurality of through holes. The collar ring surrounds the hole region and has at least one inlet opening. The first gas conveyance duct has an outlet which is aligned with the inlet opening of the collar ring, a gas flow flowing out of the outlet having a main flow direction which is directed past a centre point of the collar ring. | 09-03-2009 |
