Patent ID: 6065869
Filing Date: 2000-05-23
Classification: G01K

Abstract:
A method of in-line temperature monitoring, comprising:providing at least two control wafers, a monitor wafer, and at least one product wafer;forming a sacrificial layer over each of the control wafers and the monitor wafer;implanting ions into these sacrificial layers;performing thermal processes on a first of the two control wafers at a first temperature and a on second of the two control wafers at a second temperature, wherein the first temperature and the second temperature enclose a temperature range covering a target temperature for performing a thermal process on the monitor wafer and the product wafer;removing the sacrificial layers on the control wafers;measuring values of sheet resistance of the first and the second control wafers to obtain a first sheet resistance and a second sheet resistance corresponding to the first temperature and the second temperature, respectively;performing a thermal process on the monitor wafer and the product wafer by setting a reading temperature at the target temperature;removing the sacrificial layer on the monitor wafer; andmeasuring a sheet resistance of the monitor wafer.