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CONSTANT PHOTOCURRENT MEASUREMENT OF THE SUBGAP ABSORPTION IN POLYMER BLENDS

J. Willekens1,* , T. Aernouts2, G. J. Adriaenssens1, J. Poortmans2

Affiliation

  1. Semiconductor Physics Laboratory, University of Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium
  2. IMEC vzw, Kapeldreef 75, 3001 Leuven, Belgium

Abstract

The constant photocurrent method (CPM) was used to study sub-bandgap absorption in blends of the conjugated polymer MEH-PPV (poly [2-methoxy-5- [2'-ethyl-hexyloxy] -1,4 phenylene vinylene]) and the fullerene PCBM ((6,6) phenyl C61 butyric acid methylester) at different concentrations. The application of CPM to organic semiconductors is discussed in detail. It is argued that in these materials CPM leads to information about the product of the absorption coefficient and the quantum yield, which hampers the interpretation of the results..

Keywords

CPM, Conjugated polymer, Blends, Sub-bandgap absorption.

Submitted at: Dec. 9, 2004
Accepted at: Jan. 26, 2005

Citation

J. Willekens, T. Aernouts, G. J. Adriaenssens, J. Poortmans, CONSTANT PHOTOCURRENT MEASUREMENT OF THE SUBGAP ABSORPTION IN POLYMER BLENDS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 1, pp. 289-292 (2005)