Order of Decay of Mobile Charge Carriers in P3HT:PCBM Solar Cells
arXiv:1302.0367 · doi:10.1063/1.4816720
Abstract
The charge carrier dynamics of organic solar cells are strongly influenced by trapping and allow to draw conclusions on the loss mechanisms limiting the photovoltaic performance. In this study we derive the recombination order Δ of mobile charge carriers. For annealed P3HT:PCBM solar cells, it allows us to pinpoint the dominant recombination of mobile with trapped charge carriers in tail states. While the characteristic tail state energy of about 40 meV rises to about 100 meV for 30 h oxygen exposure under illumination, Δ decreases only weakly from 1.70 to 1.62: This corresponds to a slight shift towards trap-assisted recombination.
4 pages, 3 figures. Corrected one reference and one technical term
References in corpus (5)
- Oxygen doping of P3HT:PCBM blends: Influence on trap states, charge carrier mobility and solar cell performance
- Charge density dependent nongeminate recombination in organic bulk heterojunction solar cells
- Polaron Recombination in Pristine and Annealed Bulk Heterojunction Solar Cells
- Trap Distribution and the Impact of Oxygen-induced Traps on the Charge Transport in Poly(3-Hexylthiophene)
- Shockley Equation Parameters of Organic Solar Cells derived by Transient Techniques