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Journal of Photonics for Energy

Effect of two-dimensional-Langevin and trap-assisted recombination on the device performance of 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 two-dimensional 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: 2 March 2016
PDF: 9 pages
J. Photon. Energy. 6(1) 014501 doi: 10.1117/1.JPE.6.014501
Published in: Journal of Photonics for Energy Volume 6, Issue 1
Show Author Affiliations
Mathias Nyman, Åbo Akademi Univ. (Finland)
Oskar J. Sandberg, Åbo Akademi Univ. (Finland)
Ronald Österbacka, Åbo Akademi Univ. (Finland)

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