Dresden 2003 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 25: Organische Halbleiter II
HL 25.1: Vortrag
Dienstag, 25. März 2003, 15:15–15:30, BEY/81
Photoinduced Reflection Spectroscopy in Polymer/Fullerene Photovoltaic Devices under Working Conditions — •Christian Arndt1, Uladzimir Zhokhavets1, Gerhard Gobsch1, Christoph Winder2, Christoph Lungenschmied2, and Niyazi Serdar Sariciftci2 — 1Institute of Physics, Ilmenau Technical University , 98684 Ilmenau, Germany — 2Linz Inst. f. Organic Solar Cells (LIOS), Physical Chemistry, University Linz, Austria
The discovery of a photoinduced charge transfer interaction between conjugated polymers and fullerenes lead to intensive spectroscopic investigations in solid state composites of these materials as well as to high efficient photovoltaic devices using No-dqbulk heterojunctionsNo-dq[1]. Up to now, most spectroscopic investigations were done on thin films, whereas little is known about the behavior of the photoinduced charge carriers under working conditions of the device and applied external electric field.
In this work, we investigated thin film photovoltaic devices by means of photoinduced reflection at different temperatures (5 - 300K) and different applied external electric fields. Significant changes were observed for the density of the positive polaron on the conjugated polymer backbone. The results are discussed in comparison with current-voltage characteristics of the devices.
[1] No-dqPlastic Solar Cells No-dq; Christoph J. Brabec, N. Serdar Sariciftci, Jan C. Hummelen, Advanced Functional Materials, Vol. 11 No: 1, pp.15-26 (2001)