This Small Business Innovation Research (SBIR) Phase II project will develop process technology for removing photoresist from semiconductor wafers at high speed while not damaging underlying materials. This process technology can be readily integrated into existing single wafer wet processing tools. The development of higher performance semiconductor devices with smaller feature sizes has driven the adoption of copper and low-k dielectric materials that are susceptible to damage by traditional oxygen plasma based resist removal processes. While other low temperature plasma processes are being explored as low damage alternatives, appreciably lower resist removal rates (1,000 to 2,000 A /min) are a significant limitation. In response to this challenge the company successfully developed a new ozone-water based single wafer process chemistry which does not damage low k dielectric materials such as Black Diamond (TM), and does not corrode copper. In phase I this process achieved an etch rate greater than 8,000 A /min. The phase II research will concentrate on the early integration of the process hardware and process technology into a commercial single wafer spin processing system, the further development of process capabilities using 300 mm customer wafers, and the placement of three systems at customer sites for evaluation.
Commercially, the successful completion of this research program will culminate in the development of a new single wafer process technology for use in the manufacture of the high-density semiconductor devices with feature sizes below 90 nm. Nearly all of the new manufacturing capacity is built for 300 mm wafer fabrication at the leading edge technology node. In addition to direct sales of $60 to $120 million per year of new wafer processing equipment incorporating this technology, this project will enable the productivity benefits and reduction in unit manufacturing costs provided by the early migration to the next technology node. In addition, the innovative copper compatible cleaning chemistry developed here holds promise for corrosion free cleaning and surface treatment of copper in other electronic device manufacturing applications. Finally, this process uses an environmentally benign "green" chemistry.
