Regensburg 2004 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 12: Poster I
HL 12.96: Poster
Montag, 8. März 2004, 16:30–19:00, Poster A
Investigation of charge carrier dynamics in polymer/fullerene solar cells by means of photoinduced reflection/absorption spectroscopy — •Christian Arndt1, Uladzimir Zhokhavets1, Martina Mohr1, Gerhard Gobsch1, Maher Al-Ibrahim2, and Steffi Sensfuss2 — 1Institute of Physics, Ilmenau Technical University, 98684 Ilmenau, Germany — 2TITK Institute Rudolstadt, Department Functional Polymer Systems, 07407 Rudolstadt, Germany
The discovery of a photoinduced charge transfer between conjugated polymers and fullerenes led to the development of bulk heterojunction polymer/fullerene solar cells. This kind of organic solar cells currently offers an efficiency up to 3.5%. In order to improve this efficiency, a detailed knowledge of the generation and recombination dynamics of the charge carriers is essential.
The photoinduced absorption spectroscopy is a powerful tool to investigate the generation and recombination dynamics of polarons. Up to now, most of this spectroscopic studies were done on thin films, whereas little is known about the behaviour of the photoinduced charge carriers in the real device. In this work, we investigated the generation and recombination dynamics of polarons in bulk heterojunction MDMO-PPV/PCBM solar cells on flexible substrates, which give AM 1.5 efficiencies up to 3% by means of photoinduced reflection/absorption spectroscopy. Due to the reflection geometry of the photoinduced absorption experiment we were able to study the generation and recombination dynamics of polarons within these devices.