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A bulk-heterojunction hybrid solar cell based on CdS quantum?dots (QDs) as electron acceptor and P3HT as donor was
fabricated for the first time. The CdS QDs synthesized by a onepot?method had good crystallinity and stability. The hybrid thin?film of CdS-QDs and conjugated polymer was made by simple?spin-coating deposition of CdS-QDs/P3HT composite solution?on ITO substrates and then treated by bidentate ligand?ethanedithiol. Under AM1.5G illumination, the power-conversion?efficiency (PCE) of the thiol-treated monolayer film?was more than three times higher than that of the untreated
device. The hybrid solar cell based on the assembled trilayer?blend film with ethanedithiol by a layer-by-layer approach
exhibited a further improved PCE of 0.86%, which was sixfold?higher than that of the thiol-treated monolayer device. The
results can be explained via ethanedithiol effectively displacing?the existing stearate ligands on the surface of QDs in situ and?connecting nanoparticles by its end function group, shortening?the interdot space and thus improving electron transport?between the QDs. The morphology of the thiol-treated blend?film was briefly investigated.