The development of high voltage solar cells is an attractive way to use sun light to power electrocatalysts for water oxidation, power electrocatalyst for CO2 reduction to generate carbon based fuels that are fossil-free, and to power consumer electronics. Herein we report a single junction dye-sensitized solar cell (DSC) employing for the first time an iron redox mediator (Fe(bpy)33+/2+) in conjunction with a novel wide band gap dye (RR9). This system generates a high photovoltage of 1.42 V. To the best of our knowledge, this system is the highest photovoltage achieved by a single junction DSC device without metal oxide doping. This system introduces a new, tunable alternative to achieve high photovoltages. The Fe(bpy)33+/2+ redox shuttle was found to transfer electrons efficiently via incident photon-to-current conversion efficiency measurements to an oxidized RR9 with only a 150 mV energetic driving force for electron transfer. Finally, by utilizing the RR9/Fe(bpy)33+/2+ redox shuttle pair in a subcell for a sequential series multijunction (SSM)-DSC system, the highest known three subcell photovoltage was reported for any solar cell technology (3.18 V, &gt;1.0 V per subcell).

High voltage molecular engineered organic sensitizer-iron redox shuttle pair: 1.4 V DSC and 3.2 V SSM-DSC devices

255th National Meeting (2018)

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