Orientation modulation of ZnO nanorods on charge transfer performance enhancement for Sb2S3 quantum dot sensitized solar cells

ZnO nanorod films are prepared by electrochemical deposition process, which are employed as the photo-electrodes for the Sb2S3 quantum dot sensitized solar cells. The orientation of ZnO nanorods (NRs) is modulated by different heating time. The changing on orientation of ZnO NRs has no influences on UV -Vis absorption spectra. And the photoluminescence spectra indicates that the random orientation ZnO NRs has the better charge separation property. Due to the much more transfer paths from the random orientation of ZnO NRs, the Sb2S3 quantum dot sensitized ZnO NRs solar cells by heating time of 20 min has exhibited an excellent charge transfer property, which can obtain much higher current density of the solar cells, achieving a photovoltaic power conversion efficiency of 2.43%. (C) 2019 Elsevier B.V. All rights reserved.