Chorng-Tao Yu

Title: Innovations of Chorng-Tao Yu in Film Thickness Control

Introduction

Chorng-Tao Yu is an accomplished inventor based in Yorba Linda, California. He has made significant contributions to the field of film thickness control, particularly in the context of rapid thermal processing systems. His innovative approach enhances the accuracy of film deposition and etching processes.

Latest Patents

Chorng-Tao Yu holds a patent for a method that focuses on film thickness endpoint control. This method utilizes an ellipsometer to derive delta and psi coordinates from a polarized light beam reflected from the workpiece during processing. The measured film thickness is determined by these coordinates and other parameters. The process involves calculating the delta and psi coordinates of a selected endpoint, defining an unbounded line through this endpoint, and generating an error signal that indicates when the desired thickness has been achieved. This precision endpoint control is particularly beneficial in rapid thermal processing systems, where temperature changes occur at rates of 100 degrees Celsius or more.

Career Highlights

Chorng-Tao Yu has dedicated his career to advancing technologies related to film processing. His work at Tamarack Scientific Co. Inc. has allowed him to apply his innovative methods in practical settings, contributing to the efficiency and accuracy of film deposition techniques.

Collaborations

Chorng-Tao Yu has collaborated with Kenneth H. Isaak, further enhancing the development and application of his patented technologies. Their partnership has fostered advancements in the field of film thickness control.

Conclusion

Chorng-Tao Yu's contributions to film thickness control represent a significant advancement in the field of materials processing. His innovative methods and dedication to precision have paved the way for improved technologies in rapid thermal processing systems.