Patent ID: 8518184

Claim:
A system for depositing a radiant heat-reflective material on a microfeature workpiece, comprising: an enclosure including a wall and defining a deposition chamber, the wall having an inner surface bearing a radiant heat-reflective layer; a gas supply adapted to deliver a precursor to the deposition chamber; a radiant heater disposed outside the deposition chamber and adapted to direct radiant heat through the wall into the deposition chamber; a first temperature sensor outside the deposition chamber adapted to generate a first temperature signal corresponding to a temperature outside the deposition chamber; a second temperature sensor in the deposition chamber adapted to generate a second temperature signal corresponding to a temperature in the deposition chamber; and a programmable controller operatively coupled to the heater, the first temperature sensor, and the second temperature sensor, the controller being programmed to: control the heater based on a first algorithm during a heating phase to heat a microfeature workpiece from an initial temperature to a higher deposition temperature at which the precursor reacts to deposit the radiant heat-reflective material on the microfeature workpiece and on the radiant heat-reflective layer, wherein the first algorithm uses only the first temperature for a first period of time during the heating phase and uses only the second temperature for a second period of time during the heating phase; during a deposition phase, determine a combined temperature using a second algorithm that is different from the first algorithm such that the combined temperature is a function of both the first temperature and the second temperature; and during the deposition phase, selectively control the heater to maintain the combined temperature in a range corresponding to a deposition temperature range that encompasses the deposition temperature.