  Schottky barriers are often formed at the semiconductor/metal contacts and
affect the electrical behaviour of semiconductor devices. In particular,
Schottky barriers have been playing a major role in the investigation of the
electrical properties of mono and two-dimensional nanostructured materials,
although their impact on the current-voltage characteristics has been
frequently neglected or misunderstood. In this work, we propose a single
equation to describe the current-voltage characteristics of two-terminal
semiconductor devices with Schottky contacts. We apply the equation to
numerically simulate the electrical behaviour for both ideal and non-ideal
Schottky barriers. The proposed model can be used to directly estimate the
Schottky barrier height and the ideality factor. We apply it to perfectly
reproduce the experimental current-voltage characteristics of ultrathin
molybdenum disulphide or tungsten diselenide nanosheets and tungsten disulphide
nanotubes. The model constitutes a useful tool for the analysis and the
extraction of relevant transport parameters in any two-terminal device with
Schottky contacts.
