Patent ID: 7771537

Claim:
A system for depositing a material on a microfeature workpiece, comprising: an enclosure defining a deposition chamber; a heater adapted to deliver heat to the deposition chamber; a first temperature sensor outside the deposition chamber adapted to generate a first temperature signal corresponding to a first temperature outside the deposition chamber; a second temperature sensor in the deposition chamber adapted to generate a second temperature signal corresponding to a second 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 heat the microfeature workpiece from an initial temperature to a deposition temperature in accordance with a ramp profile by (a) comparing a control temperature to a target temperature, the target temperature being determined in accordance with the ramp profile, and (b) controlling the heater to selectively deliver heat to the deposition chamber in response to a result of the comparison between the control temperature and the target temperature, the control temperature alternating between the first temperature and the second temperature.