Cell Reports Physical Science · 2021 · 29 citations · 54 references
Natural SciencesChemistryMaterials ScienceElectronic MaterialsOptoelectronicsSpectroscopyOrganic SemiconductorsPhotoelectrochemical MaterialsPhotovoltaic DevicesPhotovoltaic MaterialsSolar Cell MaterialsSolar CellsChromophore DesignCurrent-voltage CharacterizationCurrent-voltage RelationsCurrent-voltage RelationshipDye-sensitized Solar CellsElectrical ImpedanceIndolizine ChemistryPhotocurrent Generation
Increased conversion of near-infrared (NIR) photons to electricity is needed to improve dye-sensitized solar cells (DSCs). Here, we report two squaraine dyes (RR13 and RR14) with unsymmetrical cores as NIR dyes in DSCs. Both dyes feature a conjugated indolizine donor with an indoline donor on the opposite side of the squaraine core. The dyes are studied via absorption spectroscopy, computational interrogation, and electrochemical analysis. The use of the strongly donating indolizine donor results in NIR photon-to-current conversion extending beyond 800 nm on TiO2 in DSC devices. The DSC devices were characterized by current-voltage curves, incident photon-to-current conversion efficiency measurements, and electrical impedance spectroscopy. After co-sensitized DSC device optimizations, the NIR-absorbing squaraine dyes complemented with commercial organic dyes (D35 and Y123) gave a high photocurrent output of ∼21 mA/cm2 with a PCE of 9.4%.
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