The mechanisms limiting the dark current in pentacene (Pc)/C60 solar cell were determined using the temperature dependence of the current-density-voltage characteristics. Our analysis allowed us to calculate the effective barrier height for electrons and holes at the interface. We then determined the built-in potential of the heterojunction and the effective doping concentration of the active layers, using capacitance-voltage characteristics. These physical parameters were used to simulate a band-energy diagram for a Pc/C60 solar cell in equilibrium. Finally, we determined a relation between the effective barrier height and the built-in potential.
J. C. Nolasco, A. Sánchez-Díaz, R. Cabré, J. Ferré-Borrull, L. F. Marsal, E. Palomares, J. Pallarès
Appl. Phys. Lett. 2010, 97, 013305-1/013305-3
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