Atomic-scale study of optical property of transition metal dichacogenides

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Dr. Walen fabricated and analyzed single-layer insulating hexagonal boron nitride on nickel and copper surfaces using STM, LEED, and XPS. Single phthalocyanine molecules were adsorbed to the h-BN to determine the ability of the h-BN to optically and electronically isolate single molecules from the underlying metal substrate. It turned out that the h-BN was ineffectual for optical decoupling.Thus, the experimental approach was changed, and Dr. Walen began analyzing transition metal dichalcogenide samples on many different substrates, prepared by our collaborators. We have been working closely with professors from these three universities to characterize many sample systems for her project.