Limits of open circuit voltage in organic photovoltaic devices

Lo, M. F.; Ng, T. W.; Liu, T. Z.; Roy, V. A. L.; Lai, S. L.; Fung, M. K.; Lee, C. S.; Lee, S. T.
March 2010
Applied Physics Letters;3/15/2010, Vol. 96 Issue 11, p113303
Academic Journal
Open circuit voltage (Voc) of organic photovoltaic devices has been interpreted with either the metal-insulator-metal (MIM) model or the energy offset between highest occupied molecular orbital (HOMO) of the donor and the lowest unoccupied molecular orbital (LUMO) of the acceptor (HOMOD-LUMOA). To elucidate the relation between Voc and the two models, we have used electrodes of a wide range of work functions to connect the CuPc/C60 organic photovoltaic devices. We found that when the work function difference (Δ[lowercase_phi_synonym]electrodes) between ITO and Al electrode is in the range -3 and 0 eV, Voc increases linearly with Δ[lowercase_phi_synonym]electrodes as prescribed by the MIM model. Outside this range, Voc saturates with values close to that given by the HOMOD-LUMOA less the exciton binding energy.


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