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Proceedings Paper

The effect of 2D-Langevin and trap-assisted recombination on the open circuit voltage in organic solar cells
Author(s): Mathias Nyman; Oskar J. Sandberg; Ronald Österbacka
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Paper Abstract

Using drift-diffusion simulations we have clarified the effect of 2-dimensional (2D) lamellar ordering on the device performance and, in particular, the open circuit voltage in donor-acceptor type organic solar cells. The simulations are performed both in systems where direct (band-to-band) recombination dominates and in systems where trap-assisted recombination dominates. Results show that lamellar ordering reduces both the amount of direct and trap-assisted recombination, which is beneficial for device performance. The effect is particularly prominent for small lamellar thicknesses (~ 1 nm). It is furthermore shown that in the case of s-shaped current-voltage characteristics due to electrostatic injection barriers the s-shape becomes less prominent for thinner lamellar thicknesses.

Paper Details

Date Published: 9 September 2015
PDF: 9 pages
Proc. SPIE 9567, Organic Photovoltaics XVI, 95670C (9 September 2015); doi: 10.1117/12.2188067
Show Author Affiliations
Mathias Nyman, Åbo Akademi Univ. (Finland)
Oskar J. Sandberg, Åbo Akademi Univ. (Finland)
Ronald Österbacka, Åbo Akademi Univ. (Finland)


Published in SPIE Proceedings Vol. 9567:
Organic Photovoltaics XVI
Zakya H. Kafafi; Paul A. Lane; Ifor D. W. Samuel, Editor(s)

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