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CPP: Chemische Physik und Polymerphysik
CPP 13: Dünne Polymerfilme
CPP 13.7: Talk
Thursday, March 27, 2003, 11:45–12:00, ZEU/118
Photocurrent dynamics in TPD-PPV based PR polymers — •L. Kulikovsky1, D. Neher1, E. Mecher2, F. Gallego2, K. Meerholz2, and H.-H. Hörhold3 — 1Universität Potsdam, Experimentalphysik, Am Neuen Palais 10, 14469 Potsdam, Germany — 2Ludwig-Maximilians-Universität, Physikalische Chemie, Butenandtstr. 11, 81377 München — 3Friedrich-Schiller-Universität, Institut für Organische und Makromolekulare Chemie, Humboldtstr. 10, 07743 Jena
The photorefractive effect relies on the build-up of a space charge field via charge carrier photogeneration, carrier transport and trapping. Therefore, knowledge of the photoelectric parameters is essential for the understanding and optimization of PR materials. Here we present the results of a detailed study of charge carrier dynamics in PPV-based PR-composites. It has recently been shown that this class of PR materials exhibits superior characteristics such as efficient charge carrier generation and a significant improvement in PR recording speed after appropriate preillumination [1]. Photoconductivity studies were performed under quasi-continuous, single pulse and double pulse illumination conditions and the photocurrent transients were simulated using an extended version of Schildkraut model [2]. A complete set of parameters describing the recombination, trapping and detrapping of charge carriers in shallow and deep traps could be determined. Based on these parameters, a consistent picture of the PR response with and without preillumination is developed.
1) E. Mecher et al., Nature 418, 959 (2002)
2) O. Ostroverkhova et al., J. Appl. Phys. 92, 1727 (2002)