Ambipolar small molecular semiconductor-based heterojunction diode

Ocaya R. O., Ozdemir M., ÖZDEMİR R., Al-Ghamdi A., USTA H., Farooq W. A., ...More

SYNTHETIC METALS, vol.221, pp.48-54, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 221
  • Publication Date: 2016
  • Doi Number: 10.1016/j.synthmet.2016.10.001
  • Journal Name: SYNTHETIC METALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.48-54
  • Keywords: Organo-metal diode, Schottky diode, Photodiode, 20D-TIFDKT, Polymer diode, THIN-FILM TRANSISTORS, CURRENT-VOLTAGE CHARACTERISTICS, ZN-DOPED)/N-SI SCHOTTKY DIODES, ORGANIC SEMICONDUCTOR, ELECTRICAL-PROPERTIES, CHARGE-TRANSPORT, TEMPERATURE, PHOTODIODES, INTERFACE, CHANNEL
  • Eskisehir Osmangazi University Affiliated: No

Abstract

A heterojunction diode based on an ambipolar organic semiconductor 2,8-bis(5-(2-octyldodecyl)thien-2-yl)indeno[1,2-b]fluorene-6,12-dione (20D-TIFDKT) was fabricated on p-Si using a drop-casting technique. The current-voltage and capacitance-voltage characteristics of Al/20D-TIFDKT/p-Si/Al devices with aluminized contacts were investigated under dark and 100 mW/cm(2) illumination intensity. The result is a novel interface-state controlled diode device that is shown to be rectifying. In the forward, bias it has a current that depends on the illumination intensity at constant bias, showing potential application in low-power solar cell application. In the reverse bias, it has a response that depends on the illumination intensity regardless of the applied reverse bias. This suggests a potential use as a sensor in photoconductive applications. Between 0 and 0.7 V forward bias, the ideality factor, series resistance and barrier height average at 2.35, 67.6 k Omega and 0.842 eV, respectively, regardless of illumination. (C) 2016 Elsevier B.V. All rights reserved.