Schottky Junction Methane Sensors Using Electrochemically Grown Nanocrystalline-Nanoporous ZnO Thin Films
Figure 5
Band diagram of the Schottky Junction explaining the sensing mechanism. The barrier height reduces upon exposure to the reducing gas. , are the work function of M in air and in gas, respectively. , are the barrier height of the junction in air and in gas, respectively. , are the conduction band in air and in gas, respectively. , are the valence band in air and in gas, respectively. , are the Fermi level in air and in gas, respectively, M = Pt, Pd, or Rh.
