In-situ solution chemical reaction deposition of Bi₂S₃ quantum dots on mesoscopic TiO₂ films for application in quantum-dot-sensitized solar cells

ABSTRACT

Bi₂S₃ quantum dots modified mesoscopic TiO₂ films were prepared by in-situ solution chemical reaction deposition, using ethylene glycol monomethylether (EGME) and ethanol as solvent of Cationic precursor solution and anionic precursor solution respectively. UV-vis-NIR absorption spectra reveal that the Bi₂S₃ QDs extends the range of the photo response of the TiO₂ films to visible region. A maximum conversion efficiency of 0.205% was obtained after five deposition cycles under illumination at 1000 W/m². These results indicate that the Bi₂S₃ has potential application in the field of QDSSC.

Keywords:

• In-situ chemical reaction
• bismuth sulfide
• quantum dots-sensitized solar cells

Acknowledgments

The authors acknowledge financial support from Research Program of Application Foundation of Qinghai province (Contract No. 2013-Z-701). The authors would also like to express gratitude to prof. Lan Cui and Ms. Yajing Han for their assistance in TEM and EDX analysis, respectively.