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Detection of a contact barrier by a temperaturemodulated space-charge-limited current technique

I. ZHIVKOV1,* , M. BILER2, S. NESPUREK3

Affiliation

  1. Central Laboratory of Photoprocesses, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 109, 1113 Sofia, Bulgaria
  2. AVX Czech Republic, L.t.d., Dvořákova 328, 56 301 Lanškroun, Czech Republic
  3. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovský Sq. 2, 162 06 Prague 6, Czech Republic

Abstract

The possibility of the detection of a pre-contact barrier is demonstrated for an example of a sandwich ITO|MEH-PPV|Al structure. Between the ITO electrode and the poly[2-methoxy-5-(3’,7’-dimethyloctyloxy)-1,4-phenylene vinylene] (MEH-PPV) a contact barrier is formed. The barrier detection is based on the temperature-modulated space-charge-limited current method (TM-SCLC). It consists of simultaneous measurements of the current-voltage characteristic and the activation energy of the current as a function of the voltage. The increase of the activation energy with applied voltage clearly indicates the barrier occurrence. The barrier height can be reduced by the application of a poly[3,4-(ethylenedioxy)thiophene] (PEDOT) interlayer, deposited between the ITO and MEH-PPV film. This leads an increase in the current by more than four orders of magnitude..

Keywords

Poly[2-methoxy-5-(3’,7’-dimethyloctyloxy)-1,4-phenylene vinylene, Space-charge-limited current, Schottky barrier.

Submitted at: Nov. 28, 2006
Accepted at: Feb. 15, 2007

Citation

I. ZHIVKOV, M. BILER, S. NESPUREK, Detection of a contact barrier by a temperaturemodulated space-charge-limited current technique, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 2, pp. 483-485 (2007)