Synthesis and photo-electrochemical properties of novel thienopyrazine and quinoxaline derivatives, and their dye-sensitized solar cell performance

► We have prepared novel thienopyrazine dye TP1 and quinoxaline dye QX2 and applied them to DSSCs. ► The power conversion efficiency of DSSCs with TP1 and QX2 showed 4.4% and 3.2%, respectively. ► To improve the device performances, QX2 was used as a co-adsorbent dye with TP1. ► In the mixed sensitizer based DSSC, a high power conversion efficiency of 6.2% was achieved.