期刊
APPLIED PHYSICS LETTERS
卷 96, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3360336
关键词
aluminium; binding energy; excitons; fullerene devices; fullerenes; impurity states; indium compounds; MIM devices; organic semiconductors; photovoltaic cells; work function
资金
- Research Grant Council of Hong Kong [CityU 101707]
Open circuit voltage (V-oc) 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 V-oc 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 (Delta phi(electrodes)) between ITO and Al electrode is in the range -3 and 0 eV, V-oc increases linearly with Delta phi(electrodes) as prescribed by the MIM model. Outside this range, V-oc saturates with values close to that given by the HOMOD-LUMOA less the exciton binding energy.
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