Electrical properties of safranine T/p-Si organic/inorganic semiconductor devices

Güllü Ö., Asubay S., Biber M., Kılıçoğlu T., TÜRÜT A.

EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS, vol.50, no.1, 2010 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 50 Issue: 1
  • Publication Date: 2010
  • Doi Number: 10.1051/epjap/2010022


We investigated the current-voltage (I-V) and capacitance-voltage (C-V) characteristics of identically prepared safranine T/p-Si organic/inorganic Schottky devices (total 26 diodes) formed by evaporation of organic compound solution on p-Si semiconductor substrate. It was seen that the safranine T organic thin film on the p-Si substrate showed a good rectifying behavior. The barrier heights and ideality factors of all devices were extracted from the electrical characteristics. The mean barrier height and mean ideality factor from I-V measurements were calculated as 0.59 +/- 0.02 eV and 1.80 +/- 0.20, respectively. Also, the mean barrier height and mean acceptor doping concentration from C-V measurements were calculated as 0.67 +/- 0.10 eV and (6.96 +/- 0.37) x10(14) cm(-3), respectively. The discrepancy in the barrier height values obtained from I-V and C-V characteristics has been attributed to different nature of the measurements. The discrepancy between these values can also be due to the existence of the interfacial native oxide and the organic safranine T thin layer between the semiconductor substrate and top contact metal.