Current-voltage analysis of a-Si : H Schottky diodes

Sahin M., DURMUS H., KAPLAN R.

APPLIED SURFACE SCIENCE, vol.252, no.18, pp.6269-6274, 2006 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 252 Issue: 18
  • Publication Date: 2006
  • Doi Number: 10.1016/j.apsuse.2005.08.034
  • Journal Name: APPLIED SURFACE SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.6269-6274
  • Keywords: A-Si : H Schottky diode, fill factor, space-charge limited current, DOS, carrier density, DENSITY-OF-STATES, CHARGE-LIMITED CURRENT, HYDROGENATED AMORPHOUS-SILICON, PHOTOCONDUCTIVITY
  • Abdullah Gül University Affiliated: No

Abstract

Direct current (dc)-voltage (I-V) characteristics of the hydrogenated amorphous silicon (a-Si:H) Schottky diode have been measured at different temperatures under dark and light. From the fourth quadrant of illuminated characteristics, fill factor (FF) values were obtained for each temperature measured (173-297 K). We have found that FF increases very little as the temperature is decreased. The measured data from I-V characteristics has been analyzed in detail. In particular, from dark I-V characteristics obtained, the density of state (DOS) near the Fermi level was determined using a simple model based on the space-charge limited current (SCLC). On the other hand, from the illuminated I-V characteristics, the density of carriers was calculated for each temperature using the analysis of diode equation as known. A comparison of the carrier density and the measured photocurrent as a function of the reverse temperature was also made and a good correspondence was obtained. (c) 2005 Elsevier B.V. All rights reserved.