A material may be ruled out if a subsequent processing step cannot adhere to it.

“Uh, at first, uh, you know, the first level of, uh, experiments may simply be very simple depositions and you say, "Okay, I can deposit the film, I can look at it, I can measure it," but the moment I try to make a contact to it, nothing sticks.”

“It could be something fundamental as simple as the adhesion of the next step in the process simply has no way to adhere to the material.”

“So you may rule out a material because of something as simple as that. Uh, more complex, uh, challenges might be, uh, the subsequent processing may have gaseous interactions with downstream steps.”