Performance enhancement of perovskite solar cells by employing TiO nanorod arrays decorated with CuInS quantum dots.

In this work, TiO nanorod arrays (TiO-NAs) were modified by CuInS quantum dots (CuInS QDs) on the surface of the nanorods. The resultant TiO-CuInS nanorod arrays (TiO-CuInS-NAs) were characterized by UV/Vis spectroscopy, transmission electronic microscopy (TEM), and X-ray diffraction (XRD). The TiO-CuInS-NAs were applied as scaffold for the preparation of organic-inorganic hybrid perovskite solar cells. In comparison with the solar cell devices based on TIO-NAs, a significant improvement in the power conversion efficiency had been achieved and the highest efficiency was obtained as 11.7% (under 100 mW/cm) through the optimization of the growth time of QDs on nanorods. The improvement of the device performance could be attributed to the assistance of CuInS QDs in the light harvesting as well as the facilitation of the electron injection from the perovskite to the TiO scaffold.