Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Three organic sensitizers with diarylmethylidenefluorene (DADBF) as the conjugated bridge were designed and synthesized. With the aim to optimize their photovoltaic performance, various groups with different electron properties were substituted to the DADBF unit. The relationship between their photovoltaic behaviors and the electron properties of conjugated bridges was investigated in detail by the absorption spectra, electrochemical properties and theoretical approach. Compared to -CF3 linked at the side phenyl groups, more electron-rich side groups (-SMe and -Me) contributed to higher molar extinction coefficient and IPCE values,directly leading to high conversion efficiency, providing some useful information for the optimization of organic dyes.In the corresponding solar cells, through co-adsorption with different concentrations of CDCA, no significant improvement of the photovoltaic performances were observed, suggesting that the intermolecular interactions could be suppressed efficiently by introducing the three-dimensional configuration building block DADBF into the skeleton of dye sensitizers.Among them, dye LI-64with the electron-donating moieties (-SMe) modified DPDBF exhibited the best performance withconversion efficiency of 6.32% (Jsc = 12.89 mA cm-2, Voc = 0.73 V, FF= 0.67) under AM 1.5 simulated solar light (100 mW cm-2) without the addition of CDCA.
Fig.1 The structures of the DPDBF moieties
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