Molecular Design Strategy Toward Robust Organic Dyes in Thin-Film Photoanode
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Dye-sensitized solar cells (DSSCs) have attracted attentions because of application to building integrated photo voltaic (BIPV) system. In this work, we suggested functional groups on the donor moiety and reveal relationship between molecular structure and degradation pathways divided into photo/thermal/water environmental factors. We introduced the TP-series sensitizers which have basically π-conjugated bridge unit as dithieno[3,2-b:2',3'-d]thiophene(DTT). In detailed, four sensitizers have different functional groups on the donor, and we found that functional groups in donor moiety affect PCE. Among these dyes, TP-4 achieved high stabilities in terms of thermal, light and water stability and a PCE as high as 8.86% due to the strong electron donating ability.