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Keywords:

  • barrier height;
  • Gaussian distribution;
  • perylene–monoimide;
  • organic semiconductors;
  • Schottky diodes

Abstract

We have fabricated an Au/perylene–monoimide (PMI)/n-Si organic-on-inorganic Schottky device by spin coating of PMI solution on an n-Si semiconductor wafer. Current–voltage (IV) measurements on the device in the temperature range of 75–300 K were carried out. An abnormal decrease in the experimental barrier height ΦB and an increase in the ideality factor n with a decrease in temperature have been observed. This behaviour has been explained on the basis of thermionic emission theory with a double Gaussian distribution of the barrier heights due to the barrier height inhomogeneities.