The effect of 2D-Langevin and trap-assisted recombination on the open circuit voltage in organic solar cells

Mathias Nyman; Oskar J. Sandberg; Ronald Österbacka

doi:10.1117/12.2188067

9 September 2015 The effect of 2D-Langevin and trap-assisted recombination on the open circuit voltage in organic solar cells

Mathias Nyman, Oskar J. Sandberg, Ronald Österbacka

Author Affiliations +

Proceedings Volume 9567, Organic Photovoltaics XVI; 95670C (2015) https://doi.org/10.1117/12.2188067
Event: SPIE Organic Photonics + Electronics, 2015, San Diego, California, United States

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.

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Mathias Nyman, Oskar J. Sandberg, and Ronald Österbacka "The effect of 2D-Langevin and trap-assisted recombination on the open circuit voltage in organic solar cells", Proc. SPIE 9567, Organic Photovoltaics XVI, 95670C (9 September 2015); https://doi.org/10.1117/12.2188067

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