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

Abstract

Bi₂S₃ quantum dot (QD) modified mesoscopic TiO₂ films were prepared by in situ solution chemical reaction deposition, using ethylene glycol monomethylether and ethanol as solvent of cationic precursor solution and anionic precursor solution respectively. Ultraviolet–visible–near infrared absorption spectra reveal that the Bi₂S₃ QDs extends the range of the photo response of the TiO₂ films to the visible region. A maximum conversion effciency of 0·615%, with short circuit current density of 2·940 mA cm^− 2 and open circuit voltage of 505 mV, was obtained after five deposition cycles under illumination at 1000 W m^− 2. These results indicate that the Bi₂S₃ has a potential application in the field of QD sensitised solar cell.

Keywords:

• In situ chemical reaction
• Bismuth sulphide
• Quantum dot sensitised solar cells