Conference Program - LOPE-C 2011

SCIENTIFIC CONF. | THURSDAY-JUNE 30, 2011
Track 5
OLEDs and OPV (11:30 am - 01:20 pm) | LOCATION HARMONIE E / LEVEL C2
01:00 pm Parameter extraction by simulation-based characterization of organic solar cells
Prof. Dr Beat Ruhstaller,
Fluxim AG, Switzerland
Organic electronics is a rapidly growing industry in which materials synthesis, materials characterization and device optimization plays a crucial role in the quest to achieve
ever better device performance and lifetime. The challenges are manifold. Apart from material synthesis, fabrication of record lab-scale devices and high-volume
production, there is a strong need for quick and reliable material parameter determination and device optimization. We address these challenges by presenting a
comprehensive simulation software for organic solar cells and OLEDs that seamlessly describes the photon, exciton and electron processes. In this talk we focus on the
characterization of solar cells with dedicated experiments and numerically simulate common characterization techniques such as charge extraction transients by linearly
increasing voltage (CELIV), steady-state current-voltage curves and spectral photocurrent response with a fully-coupled opto-electronic model that calculates light
penetration, photocarrier generation as well as charge extraction [Häusermann et al., J. Appl. Phys.; 106, 10450 (2009), Neukom et al., Proc. SPIE 7722 30, (2010)].
The transient and steady-state model also considers the series resistance of the setup. For a couple of bulk heterojunction solar cells we use this model to fit several
experimental datasets as a function of light intensity and temperature simultaneously. Thus we can estimate basic material parameters like the charge carrier mobility,
recombination coefficient, internal quantum efficiency and injection barriers. The mathematical quality of the fits is assessed by a covariance analysis and the determination
of confidence intervals for the fitted parameters.
01:20 pm LUNCH BREAK
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