A new aluminum iron oxide Schottky photodiode designed via sol-gel coating method

TATAROĞLU A., Hendi A. A., Alorainy R. H., Yakuphanoglu F.

CHINESE PHYSICS B, vol.23, no.5, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 23 Issue: 5
  • Publication Date: 2014
  • Doi Number: 10.1088/1674-1056/23/5/057504
  • Journal Name: CHINESE PHYSICS B
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: spinel ferrite, Schottky photodiode, I-V characteristics, barrier height, I-V CHARACTERISTICS, CURRENT-VOLTAGE, ELECTRICAL CHARACTERISTICS, INTERSECTING BEHAVIOR, DIODE, TEMPERATURE, FILMS, ILLUMINATION, SERIES, FREQUENCY
  • Gazi University Affiliated: Yes

Abstract

A novel aluminum iron oxide (Al/AlFe2O4/p-Si) Schottky photodiode was successfully fabricated via the sol-gel coating process. The microstructure of the spinel ferrite (AlFe2O4) was examined by atomic force microscopy. The current-voltage characteristics of the fabricated photodiode were studied under dark and different illumination conditions at room temperature. By using the thermionic emission theory, the forward bias I-V characteristics of the photodiode are analyzed to determine the main electrical parameters such as the ideality factor (n) and barrier height (Phi(B0)) of the photodiode. The values of n and Phi(B0) for all conditions are found to be about 7.00 and 0.76 eV, respectively. In addition, the values of series resistance (R-s) are determined using Cheung's method and Ohm's law. The values of Rs and shunt resistance (R-sh) are decreased with the increase of illumination intensity. These new spinel ferrites will open a new avenue to other spinel structure materials for optoelectronic devices in the near future.