Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 90: Poster III
HL 90.28: Poster
Donnerstag, 10. März 2016, 16:00–19:00, Poster A
Confocal photoluminescence measurements of the charge transfer state in diluted bulk heterojunctions — •Martin Streiter, Alexander Wagenpfahl, and Carsten Deibel — Institut für Physik, Technische Universität Chemnitz, 09126 Chemnitz, Germany
The understanding of recombination mechanisms at donor-acceptor interfaces is of high importance for improving organic solar cells, as they determine the open circuit voltage and influence the photocurrent. In order to investigate the local properties of charge transfer (CT) states in view of nongeminate losses, we studied diluted bulk heterojunction films.
Photoluminescence spectroscopy was performed using a confocal laser scanning microscopy setup with cryostat sample stage to collect spatially resolved CT emission with sub-micron resolution. Spin coated TAPC-C60 and TAPC-PCBM films with less than 1 mol% acceptor concentration were studied. We investigated the connection between structural information, e.g. acceptor material cluster formation, to CT emission and discuss the results with respect to thermal activation and energetic disorder.