Patent ID: 7820549
Filing Date: 2010-10-26
Classification: H01L

Abstract:
1. A process for producing a semiconductor wafer having improved global geometry, comprising providing a semiconductor wafer with a diameter of at least 200 mm comprising a silicon carrier wafer portion, an electrically insulating layer, and a semiconductor layer located thereon, the semiconductor wafer having been produced by means of a layer transfer process comprising at least one RTA step, wherein the semiconductor wafer has a warp of less than 30 μm, a DeltaWarp of less than 30 μm, a bow of less than 10 μm and a DeltaBow of less than 10 μm, and heat treating the semiconductor wafer, the process comprising heat treating by at least one of a) heat treating the semiconductor wafer at a heating rate of from 10 to 200° C./s to a temperature in the range from 1,100 to 1,250° C., holding the semiconductor wafer in this temperature range for a period of 5 s to 300 s, and cooling the semiconductor wafer at a cooling rate of from 0.5 to 25° C./s, or b) heat treating the semiconductor wafer at a heating rate of from 10 to 200° C./s to a temperature in a first temperature range of from 1,100 to 1,250° C.; holding the semiconductor wafer in the first temperature range for a first period of 5 s to 300 s; cooling the semiconductor wafer at a first cooling rate of from 10 to 150° C./s until the temperature is in a second temperature range of from 1,000 to 1,150° C., the temperature in the second temperature range being lower than the temperature in the first temperature range; holding the semiconductor wafer in the second temperature range for a second period of 10 s to 300 s;, and cooling the semiconductor wafer at a second cooling rate of from 10 to 150° C./s, or c) heat treating the semiconductor wafer in a first heat treatment in which the semiconductor wafer is heated at a first heating rate of from 10 to 200° C./s to a temperature in a first temperature range of from 1,100 to 1,250° C., holding the semiconductor wafer in the first temperature range for a first period of 5 s to 300 s, cooing the semiconductor wafer at a first cooling rate of from 10 to 150° C./s, and heat treating the semiconductor wafer in a second heat treatment in which the semiconductor wafer is heated at a second heating rate of from 10 to 200° C./s until the temperature has reached a value in a second temperature range of from 1,000 to 1,150° C., holding the semiconductor wafer in the second temperature range for a second period of 10 s to 300 s, and cooling the semiconductor wafer at a second cooling rate of from 10 to 150° C./s, or d) heat treating the semiconductor wafer in a heat treatment in an atmosphere which contains more than 12,000 ppm of oxygen, in which the semiconductor wafer is heated at a heating rate of from 10 to 200° C. until the temperature has reached a value in the range from 1,100 to 1,250° C., holding the semiconductor wafer in this temperature range for a period of 5 s to 300 s, and cooling the semiconductor wafer at a cooling rate of from 10 to 150° C./s.