Contact:

Tiffany Schofield, 265-5271 Mohamed El-Genk, 277-5442 Michael Padilla, 277-1816

January 31, 2002

Schofield part of UNM team scheduled for NASA flight at Johnson Space Center

Los Alamos native Tiffany Schofield, daughter of Phillip and Vicky Schofield, is among a team of students from the University of New Mexico Department of Chemical and Nuclear Engineering that will fly an experiment on board the microgravity KC-135 airplane at Johnson Space Center on March 7.

The project is part of the NASA Reduced Gravity Student Flight Opportunities Program.

This is the second year in a row the department has won this national competition allowing the students to investigate the effect of weightlessness on spin-coating of computer wafers. The members of UNM, “S.P.I.N. Doctors” (Study of Photoresist in New Mexico) team, will fly on two consecutive days, two members each day for two hours.

“One of the biggest challenges has been and will be a time crunch,” Schofield said. “NASA deadlines are rapidly approaching and we have a lot more control experiments to run. We are also doing all of our trials at Sandia, which complicates everything with security issues.”

She said at the same time the team is are dealing with logistics of the experiment.

“We are attempting to raise enough money to pay for our travel expenses to Houston to actually run the experiment,” she said.
Schofield is presently a senior at UNM studying chemical engineering. She plans to attend graduate school in the fall. Last year she attended the University of Rhode Island through a National Student Exchange program.

“This is indeed great national recognition for UNM and a great opportunity and hands-on experience for our students,” said Mohamed El-Genk, faculty advisor for the project.

Spin-coating a photoresist polymer over a silicon substrate is traditionally one of the first steps in the manufacture of microprocessors in the semiconductor industry. This process is also widely employed in a number of other applications, including flat-screen display coatings, compact disks and television tube phosphor coatings. El-Genk said spin-coating is a fairly simple procedure involving minimal equipment and time.

The overall objectives of the experiment are to determine what role gravity plays in the spin-coating process and to ascertain whether or not spin-coating represents a viable method to coat a substrate with a thin, uniform film of material in a zero-gravity environment.

As at team member, Schofield will be looking at the deposit uniformity across the wafer and will also be assisting the team in preparing the equipment for flight and control tests prior to flight.

El-Genk said the procedure on board of the KC-135 airplane represents a fascinating, though somewhat complicated, fluid dynamics problem.

“Through the proposed experimentation, we hope to quantify the role gravity plays in the process, as well as determine if spin-coating may someday be feasible in a space environment,” El-Genk said.

The experiment will be carried out similarly to last year’s experiment. A modified spin-coater will be adapted for operation aboard the plane. The experiment will require two operators: one to store prepared wafers and place a clean wafer into the instrument, the other to change the parameters on the instrument control panel. Upon return to the lab, the photoresist films of each wafers prepared aboard the KC-135 will be profiled. This will help determine the overall thickness of the photoresist film, as well as the characteristics of the film at the edge of the wafer.

The specific objectives of the experiments are to collect a large enough database on spin-coating in microgravity and examine the effects of different operation parameters such the spin speed, the dispense rate of the photoresist polymer, and to obtain high-quality video footage of the spin-coating process in microgravity. In addition, the objective is to compare the characteristics of the photoresist film developed in microgravity, and examine the reproducibility of the results by performing repetitive experiments at the same condition in microgravity.

El-Genk said the team hopes to conduct several outreach activities to increase awareness regarding the experiment. Presentations will be conducted at Eldorado and Sandia High Schools as well as at other public schools. A video will also be created to highlight the experiment.

Tom Gamble, is the student team leader, and El-Genk, faculty advisor. The faculty co-advisor is Robert Busch, chemical and nuclear engineering professor. The external technical advisor is Dr. Steve Thornberg from Sandia National Laboratories.

Thornberg collaborated with UNM last year and provided all the hardware used in the experiment. The UNM team consists of chemical and nuclear engineering undergraduate students, Jason Brown, Schofield, Brett Andrzejewski, Julie Nguyen, Daniel Torres and Thomas Quirk. High school students include Chris Cutler, Eldorado High School, and Corey Flack, Sandia High School.

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