Electron-Affinity-Triggered Variations on the Optical and Electrical Properties of Dye Molecules Enabling Highly Efficient Dye-Sensitized Solar Cells

Liu, YuhangCao, YimingZhang, WeiweiStojanovic, MarkoDar, M. IbrahimPechy, PeterSaygili, YaseminHagfeldt, AndersZakeeruddin, Shaik MohammedGraetzel, Michael2018-12-132018-12-132018-12-132018-10-2210.1002/anie.201808609https://infoscience.epfl.ch/handle/20.500.14299/151929WOS:000447371500023The synthesis, characterization, and photovoltaic performance of a series of indacenodithiophene (IDT)-based D--A organic dyes with varying electron-accepting units is presented. By control of the electron affinity, perfectly matching energy levels were achieved with a copper(I/II)-based redox electrolyte, reaching a high open-circuit voltage (>1.1V) while harvesting a large fraction of solar photons at the same time. Besides achieving high power conversion efficiencies (PCEs) for dye-sensitized solar cells (DSCs), that is, 11.2% under standard AM1.5G sunlight, and 28.4% under a 1000 lux fluorescent light tube, this work provides a possible method for the design and fabrication of low-cost highly efficient DSCs.Chemistry, MultidisciplinaryChemistryambient light photovoltaicscopper electrolytedye-sensitized solar cellshigh voltagemolecular engineeringorganic sensitizersabsorptiondonorsElectron-Affinity-Triggered Variations on the Optical and Electrical Properties of Dye Molecules Enabling Highly Efficient Dye-Sensitized Solar Cellstext::journal::journal article::research article