Abstract
Three D-π-A-π-A organic dyes (QX1, DTQX1 and TPZ1) were synthesized and used as photosensitizers in Dye Sensitized Solar Cells (DSSC). The molecules only vary by the nature of the linker connecting a side dithienylpyrazine motive to a triarylamine-based donating unit and a phenylcyano-acrylic acid to provide the anchoring function. By simply swapping the aromatic connecting unit the range and intensity of the absorption of the compounds can be tuned, leading to orange and green dyes. The energy levels of the frontier orbitals are well-positioned for use in DSSC with TiO2 as the photoanode and I−/I3− as a redox couple in the electrolyte. Solar cells based on these sensitizers showed a power conversion efficiency (PCE) of up to 8.6% for the dyes with the narrower absorption. The lower PCE with TPZ1 is attributed to the more quinoidal nature of the π-conjugated backbone, which leads to a less favorable spatial distribution of the frontier orbitals and results in lower electron injection and higher recombination rate.
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