This article appears to center on germanium, but the first procedures to prepare high-purity silicon were developed by Carl Marcus Olson of DuPont for WW2 radar

This article appears to center on germanium, but the first procedures to prepare high-purity silicon were developed by Carl Marcus Olson of DuPont for WW2 radar components. It was nearly two decades after the end of the war that transistor demand would need this procedure again. http://smithsonianchips.si.edu/olson/article.htm http://smithsonianchips.si.edu/olson/article.htm https://en.wikipedia.org/wiki/Carl_Marcus_Olson https://en.wikipedia.org/wiki/Carl_Marcus_Olson