Physics – Condensed Matter – Materials Science
Scientific paper
2009-07-14
Phys. Rev. B 80, 075203 (2009)
Physics
Condensed Matter
Materials Science
7 pages, 6 figures
Scientific paper
10.1103/PhysRevB.80.075203
We propose a model to explain the reduced bimolecular recombination rate found in state-of-the-art bulk heterojunction solar cells. When compared to the Langevin recombination, the experimentally observed rate is one to four orders of magnitude lower, but gets closer to the Langevin case for low temperatures. Our model considers the organic solar cell as device with carrier concentration gradients, which form due to the electrode/blend/electrode device configuration. The resulting electron concentration under working conditions of a solar cell is higher at the cathode than at the anode, and vice versa for holes. Therefore, the spatially dependent bimolecular recombination rate, proportional to the local product of electron and hole concentration, is much lower as compared to the calculation of the recombination rate based on the extracted and thus averaged charge carrier concentrations. We consider also the temperature dependence of the recombination rate, which can for the first time be described with our model.
Deibel Carsten
Dyakonov Vladimir
Wagenpfahl Alexander
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