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

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Abstract
The synthesis, characterization, and photovoltaic performance of a series of indacenodithiophene (IDT)‐based D‐π‐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 (>1.1 V) 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 AM 1.5 G 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.
Funding Information
  • Bundesamt für Energie (SI/501464-01)
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (200021_157135/1)
  • China Scholarship Council

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