Electrical conductivity, optical and metal–semiconductor contact properties of organic semiconductor based on MEH-PPV/fullerene blend Original Research Article

The electrical conductivity, optical and metal–semiconductor contact properties of the MEH-PPV:C70 organic semiconductor have been investigated. The electrical conductivity results show that the MEH-PPV:C70 film is an organic semiconductor. The optical band gap of the film was found to be 2.06 eV and the fundamental absorption edge in the film is formed by the direct allowed transitions. The refractive index dispersion curve of the film obeys the single oscillator model and Ed and Eo dispersion parameters were found to be 10.61 and 3.89 eV, respectively. The electrical characterization of the ITO/MEH-PPV:C70 diode have been investigated by current–voltage characteristics. ITO/MEH-PPV:C70 diode indicates a non-ideal current–voltage behavior with ideality factor n (2.50) and barrier height φB (0.90 eV) values.