Abstract
We report the simple synthesis of two organic chromophores featuring an ethynyl-thienothiophene linker with an n-hexyl chain (CSD-03 and CSD-04), their optical and electrochemical properties, and their use as photosensitizers in dye-sensitized solar cells (DSSCs). Our theoretical and experimental studies show that adding the second thienothiophene allows for narrowing the bandgap of the molecule and thus ensuring more light harvesting in the visible region. The efficiencies of both CSD-03 (5.46 ± 0.03%) and CSD-04 (5.20 ± 0.03%) are comparable to that of N719 (5.92 ± 0.01%) in translucent DSSCs fabricated with 5 μm-thick TiO2 photoanodes.
Highlights
IntroductionThe prosperity of a human society is mainly dependent on the supply of sustainable energy
The prosperity of a human society is mainly dependent on the supply of sustainable energy.Because of inevitable and imminent shortages of fossil fuels together with global warming, we should look for affordable and clean energy resources
We report dyes, coded dyes, as CSD-03 ethynyl-thieno[3,2-b]thiophene spacers
Summary
The prosperity of a human society is mainly dependent on the supply of sustainable energy. Because of inevitable and imminent shortages of fossil fuels together with global warming, we should look for affordable and clean energy resources. Solar energy is considered a promising way to meet future energy demand. Was invented in 1991 [1], numerous efforts on materials and device architecture have been made to achieve high performance and long-term stability [2,3,4]. In DSSCs, the chromophore responsible for capturing solar light and producing photocurrent is a critical component to enhance their power conversion efficiency (PCE).
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