Semiconductor wafer, semiconductor device using the same, and method and apparatus for producing the same
A method of processing a semiconductor wafer includes preheating the wafer to a preheating temperature that is less than a peak temperature, heating the wafer from the preheating temperature to the peak temperature at a first ramp rate that averages about 100° C. per second or more, and, immediately after heating the wafer from the preheating temperature to the peak temperature, cooling the wafer at a second ramp rate that averages about −70° C. per second or more from the peak temperature to the preheating temperature, wherein the peak temperature is about 1,100° C. or more.
1. A method of processing a semiconductor wafer, comprising:
preheating the wafer to a preheating temperature that is less than a peak temperature;
using front side heating to heat the wafer from the preheating temperature to the peak temperature at a first ramp rate that averages about 100° C. per second or more; and
immediately after heating the wafer from the preheating temperature to the peak temperature, cooling the wafer at a second ramp rate that averages about −70° C. per second or more from the peak temperature to the preheating temperature,
wherein:
the peak temperature is about 1,100° C. or more, and
cooling the wafer at the second ramp rate includes back surface cooling by directing a gas stream at a back surface of the wafer, the gas stream being emitted from a cooling unit that faces the back surface of the wafer, the back surface cooling being begun while heating the wafer at the first ramp rate.
2. The method as claimed in claim 1 , wherein the first ramp rate averages about 250° C. per second or more.
3. The method as claimed in claim 1 , wherein heating the wafer from the preheating temperature to the peak temperature and cooling the wafer is performed in a combined time of about 4 seconds or less.
4. The method as claimed in claim 3 , wherein the first ramp rate averages about 250° C. per second or more.
5. The method as claimed in claim 3 , wherein the second ramp rate averages about −100° C. per second or more.
6. The method as claimed in claim 1 , wherein the preheating temperature is about 800° C. or less, heating the wafer from an initial temperature to the preheating temperature is performed in a time of about 60 seconds or less, and cooling the wafer at the second ramp rate is continued until the wafer is about room temperature.
7. The method as claimed in claim 1 , wherein the preheating temperature is between about 500° C. and about 800° C.