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Gate-Tunable Graphene-WSe Heterojunctions at the Schottky-Mott Limit. | LitMetric
Metal-semiconductor interfaces, known as Schottky junctions, have long been hindered by defects and impurities. Such imperfections dominate the electrical characteristics of the junction by pinning the metal Fermi energy. Here, a graphene-WSe p-type Schottky junction, which exhibits a lack of Fermi level pinning, is studied. The Schottky junction displays near-ideal diode characteristics with large gate tunability and small leakage currents. Using a gate electrostatically coupled to the WSe channel to tune the Schottky barrier height, the Schottky-Mott limit is probed in a single device. As a special manifestation of the tunable Schottky barrier, a diode with a dynamically controlled ideality factor is demonstrated.
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