Copper-phthalocyanine-based organic solar cells with high open-circuit voltage

Singh, V. P.; Singh, R. S.; Parthasarathy, B.; Aguilera, A.; Anthony, J.; Payne, M.
February 2005
Applied Physics Letters;2/21/2005, Vol. 86 Issue 8, p082106
Academic Journal
We report on a copper phthalocyanine (CuPc)/3,4,9,10 perylenetetracarboxylic bisbenzimidazole (PTCBI) organic solar cell with an aluminum cathode exhibiting an open-circuit voltage (VOC) of 1150 mV and a short-circuit current density (JSC) of 0.125 mA/cm2. For comparison, aluminum and silver were used as electrode materials and their effects on device characteristics were studied; silver yielded lower VOC but higher JSC and higher efficiency. Results could be understood through a model that hypothesized surface modification of CuPc by PTCBI and the formation of a thin insulating layer between aluminum and PTCBI when aluminum was used as electrode.


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