Effect of two-dimensional-Langevin and trap-assisted recombination on the device performance of organic solar cells

Mathias Nyman; Oskar J. Sandberg; Ronald Österbacka

doi:10.1117/1.JPE.6.014501

2 March 2016 Effect of two-dimensional-Langevin and trap-assisted recombination on the device performance of organic solar cells

Mathias Nyman, Oskar J. Sandberg, Ronald Österbacka

Author Affiliations +

Funded by: Academy of Finland

Journal of Photonics for Energy, Vol. 6, Issue 1, 014501 (March 2016). https://doi.org/10.1117/1.JPE.6.014501

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.

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Mathias Nyman, Oskar J. Sandberg, and Ronald Österbacka "Effect of two-dimensional-Langevin and trap-assisted recombination on the device performance of organic solar cells," Journal of Photonics for Energy 6(1), 014501 (2 March 2016). https://doi.org/10.1117/1.JPE.6.014501

Published: 2 March 2016

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