Sequential series multijunction dye-sensitized solar cells (SSM-DSCs) are mechanically stacked single illuminated area DSC devices wired in series to harness photovoltage. The potential applications of SSM-DSCs are for battery charging and solar-to-fuel conversions with small area devices. In this study, strategies to minimize photon reflection losses from glass and glass-air interface and photon management are combined. With a judicious choice of the sensitizer, TiO2 film thickness, solution processable “CYTOP” antireflection coating, and immersion oil SSM-DSCs with power conversion efficiency &gt;10% and 2.3 V photovoltage were achieved. Impressively, the SSM-DSC efficiency was substantially higher than any single device in the stack. Furthermore, without external bias, this SSM-DSC configuration shows an impressive overall solar-to-fuel conversion efficiency of 6% when powering IrO2 and Au2O3 electrocatalysts for CO2 and H2O to CO and H2 conversion in aqueous solution. The concept of photon management in SSM-DSCs, device engineering, and the role of CYTOP will be covered in the talk.

Sequential-series multijunction dye-sensitized solar cells with 10.1% efficiency and 2.3 V output

2019 Fall National Meeting

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