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High-Voltage Dye-Sensitized Solar Cells Mediated by [Co(2,2'-bipyrimidine) 3 ] z .
Inorganic Chemistry 2017 March 7
The cobalt complex [Co(2,2'-bipyrimidine)3 ](PF6 )2 (Co-bpm) was tested as a redox mediator in the dye-sensitized solar cell. The measured photovoltages for the cells were in excess of 1 V, which is approximately 3-fold greater than that measured for devices where [Co(2,2'-bipyridine)3 ](PF6 )2 (Co-bpy) was used as the redox mediator under the same experimental conditions. The root cause of this voltage enhancement is the CoIII /CoII redox potential for Co-bpm being positively shifted by 0.50 V relative to the Co-bpy mediator. This result highlights how the number and position of the N atoms in aromatic ligands can have a profound effect on the measured photovoltage.
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