Physics – Condensed Matter – Materials Science
Scientific paper
2011-10-04
Appl. Phys. Lett. 98:133301 (2011)
Physics
Condensed Matter
Materials Science
4 pages, 2 figures
Scientific paper
10.1063/1.3566979
The open circuit voltage Voc and the corresponding charge carrier density were measured in dependence of temperature and illumination intensity by current-voltage and charge extraction measurements for P3HT:PCBM and P3HT:bisPCBM solar cells. At lower temperatures a saturation of Voc was observed which can be explained by energetic barriers at the contacts (metal-insulator-metal model). Such injection barriers can also influence Voc at room temperature and limit the performance of the working solar cell, as was assured by macroscopic device simulations on temperature-dependent IV characteristics. However, under most conditions - room temperature and low barriers - Voc is given by the effective bandgap.
Deibel Carsten
Dyakonov Vladimir
Rauh Daniel
Wagenpfahl Alexander
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