查看文章

CdSe_0.45Te_0.55 alloyed quantum dots (QDs) with excitonic absorption onset at 800 nm and particle size of 5.2 nm were prepared via a noninjection high-temperature pyrolysis route and used as a sensitizer in solar cells. A postsynthesis assembly approach with use of bifunctional linker molecule mercaptopropionic acid (MPA) capped water-soluble QDs, obtained via ex situ ligand exchange from the initial oil-dispersible QDs, was adopted for tethering QDs onto mesoporous TiO₂ film. With the combination of high loading of the QD sensitizer and intrinsic superior optoelectronic properties (wide absorption range, high conduction band edge, high chemical stability, etc., relative to their constituents CdSe and CdTe) of the adopted CdSe_0.45Te_0.55 QD sensitizer, the resulting CdSe_xTe_1–x alloyed QD-based solar cells exhibit a record conversion efficiency of 6.36% (J_sc = 19.35 mA/cm², V_oc = 0.571 V, FF = 0.575 …