Organic solar cell efficiencies under the aspect of reduced surface recombination velocities
arXiv:1001.4963 · doi:10.1109/JSTQE.2010.2042142
Abstract
The charge carrier mobility is a key parameter for the organic bulk heterojunction solar cell efficiency. It was recently shown that the interplay charge carrier transport and recombination, both depending on electron and hole mobilities, leads to a point of maximum power conversion efficiency at a finite mobility. Changes of bulk and surface recombination rate, however, can strongly influence this behavior. These processes were previously not considered adequately, as surface recombination velocities of infinity were implicitly assumed or bulk recombination parameters not discussed in detail. In this manuscript, using a macroscopic effective medium simulation, we consider how a reduced bulk recombination process in combination with finite surface recombination velocities affect the power conversion efficiency. Instead of a maximum efficiency at a specific charge carrier mobility, we show that with realistic assumptions and passivated surfaces the efficiency is increased further, saturating only at higher mobilities. Thus, a mobility optimisation is more important for the solar cell performance then previously shown.
arXiv comment6 pages, 5 figures
References in corpus (7)
- S-shaped current-voltage characteristics of organic solar devices
- Origin of Reduced Polaron Recombination in Organic Semiconductor Devices
- Coupled opto-electronic simulation of organic bulk-heterojunction solar cells: parameter extraction and sensitivity analysis
- Influence of Charge Carrier Mobility on the Performance of Organic Solar Cells
- Polaron Recombination in Pristine and Annealed Bulk Heterojunction Solar Cells
- Bipolar Charge Transport in Poly(3-hexyl thiophene)/Methanofullerene Blends: A Ratio Dependent Study
- Polaron Recombination in Pristine and Annealed Bulk Heterojunction Solar Cells
Cited by in corpus (8)
- Relation of open circuit voltage to charge carrier density in organic bulk heterojunction solar cells
- Comment on "Interface state recombination in organic solar cells"
- On the effect of surface recombination in thin film solar cells, light emitting diodes and photodetectors
- Impact of a doping-induced space-charge region on the collection of photo-generated charge carriers in thin-film solar cells based on low-mobility semiconductors
- Effect of Imbalanced Charge Transport on the Interplay of Surface and Bulk Recombination in Organic Solar Cells
- Direct quantification of quasi-Fermi level splitting in organic semiconductor devices
- Network analysis of the performance of organic photovoltaic cells: The open circuit voltage and the zero current efficiency
- Distribution of charge carrier transport properties in organic semiconductors with Gaussian disorder