Materials and Device Modeling and Simulation

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

[+] Author Affiliations
Mathias Nyman, Oskar J. Sandberg, Ronald Österbacka

Åbo Akademi University, Physics, Faculty of Science and Engineering and Center for Functional Materials, Porthaninkatu 3, 20500 Turku, Finland

J. Photon. Energy. 6(1), 014501 (Mar 02, 2016). doi:10.1117/1.JPE.6.014501
History: Received December 8, 2015; Accepted February 2, 2016
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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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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

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", J. Photon. Energy. 6(1), 014501 (Mar 02, 2016). ; http://dx.doi.org/10.1117/1.JPE.6.014501


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