Patent ID: 6770851
Filing Date: 2004-08-03
Classification: H01L

Abstract:
A method for heat treatment of a substrate, comprising:introducing the substrate into a heat treatment apparatus, wherein the heat treatment apparatus comprises two substantially flat parts parallel to an introduction position of the substrate, between which the substrate is received, wherein a first part of the two substantially flat parts is heated and is at a first high temperature and during at least part of a treatment time on each of two major sides of the substrate a gas flow is supplied to implement heat treatment by heat conduction between the substrate and each of the first and the second parts of the two substantially flat parts through the gas, characterized in that the second part is actively cooled and is at a second lower temperature wherein the second temperature is lower than 70Â° C.; controlling properties of at least one of the supplied gas flows in such a way that, during a determined substrate heating time during the treatment, heat conduction between the substrate and the first part is at a comparatively high value while heat conduction between the substrate and the second part is at a comparatively low value so that the substrate takes on a temperature that is comparatively closer to the first high temperature; then controlling properties of at least one of the supplied gas flows in such a way that, during a determined substrate cooling time, heat conduction between the substrate and the first part is at a comparatively low value while heat conduction between the substrate and the second part is at a comparatively high value so that the substrate takes on a temperature which is comparatively closer to the second lower temperature; and removing the wafer from the introduction position after the substrate cooling time, wherein the substrate first is closer to the second low temperature than the first high temperature, then is closer to the first high temperature than the second low temperature and then is closer to the second low temperature again.