
Proceedings Paper
Transient photocurrent response of organic bulk heterojunction solar cellsFormat | Member Price | Non-Member Price |
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Paper Abstract
Accurate mobility determination is essential to model and improve the efficiency of organic solar cells. A frequently
used method to determine charge carrier mobilities is called CELIV(charge extraction by a linearly
increasing voltage). In this technique a voltage ramp is applied to the device in order to extract the free charge
carriers inside the cell. With an extended method called photo-CELIV the free charge carriers are first generated
by a short laser pulse and are then extracted after an adjustable time. To analyse the experiment analytical
formulas are used.
We simulate the CELIV and photo-CELIV method with a fully coupled electro-optical model. Our numerical
model allows us to reveal the limitations of analytical expressions used to analyse CELIV transients. The
influence of the mobility, the series resistance, the voltage slope and the illumination intensity on the CELIV
transients are studied. We show that using the analytical formulas only the order of magnitude of the mobility
can be determined.
We also perform CELIV measurements on organic bulk heterojunction solar cells based on a PT5DPP:PCBMC70
blend. By fitting the numerical simulation to the measured transients we extract charge carrier mobilities, the
recombination efficiency and the series resistance.
Paper Details
Date Published: 18 May 2010
PDF: 12 pages
Proc. SPIE 7722, Organic Photonics IV, 77220V (18 May 2010); doi: 10.1117/12.854668
Published in SPIE Proceedings Vol. 7722:
Organic Photonics IV
Paul L. Heremans; Reinder Coehoorn; Chihaya Adachi, Editor(s)
PDF: 12 pages
Proc. SPIE 7722, Organic Photonics IV, 77220V (18 May 2010); doi: 10.1117/12.854668
Show Author Affiliations
Martin T. Neukom, Zurich Univ. of Aplied Sciences (Switzerland)
Nils A. Reinke, Zurich Univ. of Aplied Sciences (Switzerland)
Nils A. Reinke, Zurich Univ. of Aplied Sciences (Switzerland)
Kai A. Brossi, Zurich Univ. of Aplied Sciences (Switzerland)
Beat Ruhstaller, Zurich Univ. of Aplied Sciences (Switzerland)
FLUXiM AG (Switzerland)
Beat Ruhstaller, Zurich Univ. of Aplied Sciences (Switzerland)
FLUXiM AG (Switzerland)
Published in SPIE Proceedings Vol. 7722:
Organic Photonics IV
Paul L. Heremans; Reinder Coehoorn; Chihaya Adachi, Editor(s)
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