Synergistic Effect of CdS and PbS Sensitizers in Quantum Dot Sensitized Solar Cells

摘要

Quantum dot sensitized solar cells have been constructed by using photoanodes based on nanoparticulate titania sensitized with PbS or CdS quantum dot semiconductors and by their combination. PbS alone gave a pure behavior excluding it as sensitizer. When CdS was added on the top of the PbS layer, an impressive synergy was demonstrated inducing a ten-fold current increase. In addition, the presence of CdS provided protection to the combined sensitizer thus offering a satisfactory solar cell performance.