Highly Efficient CdS Quantum Dot-Sensitized Solar Cells Based on a Modified Polysulfide Electrolyte

摘要

A modified polysulfide redox couple, [ (CH_3)_4 N]_2S/[(CH_3)_4N]_2S_W in an organic solvent (3-methoxypro-pionitrile) was employed in CdS quantum dot (QD)-sensi-tized solar cells (QDSSCs), and an unprecedented energy conversion efficiency of up to 3.2% was obtained under AM 1.5 G illumination. The QDs were linked to nanoporous TiO_2 via covalent bonds by using thioglycolic acid, and chemical bath deposition in an organic solvent was then used to prepare the QDSSCs, facilitating high wettability and superior penetration capability of the TiO_2 films. A very high fill factor of 0.89 was observed with the optimized QDSSCs.