Q&A: Growing novel ultra-pure materials for tomorrow’s electronics

Pairing elements such as sulfur, selenium or tellurium with metals produces compounds whose atomic interactions give them unusual and useful electrical, optical and magnetic behavior. These materials, called chalcogenides, are the focus of Qihua “David” Zhang’s work as a postdoctoral researcher in the Two-Dimensional Crystal Consortium (2DCC) at Penn State in the laboratory of Stephanie Law, Wilson Family Fellow and associate professor of materials science and engineering. Zhang recently earned the 2025 American Vacuum Society’s Thin Film Division Distinguished Technologist Award for his contributions to growing these materials with extreme purity and precision.