Abstract
AbstractUnderstanding the various size effects of CuInS2 quantum dots is very important for improving the performance of quantum‐dot‐sensitized solar cells. In this work, CuInS2 quantum dots with sizes ranging from 2 to 8 nm have been synthesized by a simple thermolysis method and a ligand‐exchange process. The quantum dots as sensitizers were uniformly attached to the surface of TiO2 nanoparticle films capped with 3‐mercaptopropionic acid to form sensitized solar cells. Various sized CuInS2 quantum dots and sensitized TiO2 photoanodes were studied by XRD, TEM, UV/Vis, and PL spectroscopy. It was found that the CuInS2 quantum dots were successfully adsorbed on to the TiO2 nanoparticle films, and TiO2 photoanodes sensitized with 3.5 nm CuInS2 quantum dots have the highest optical absorption and best photovoltaic conversion efficiency of 0.72 % with a short circuit current density of 2.02 mA/cm2 and a voltage of 0.515 V under AM 1.5 illumination.
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