Photosensitization of TiO2 nanorods with CdS quantum dots for photovoltaic devices

• DOI: 10.1016/j.electacta.2010.10.003
• Publication Date: 2010-10-11T14:47:13Z
• Authors: Hui Chen; Wuyou Fu; Haibin Yang; Peng Sun; Yanyan Zhang; Lianru Wang; Wenyan Zhao; Xiaoming Zhou; Hui Zhao; Qiang Jing; Xuefeng Qi; Yixing Li
• Keywords: Nanorod; Photocurrent; Chemical bath deposition; Deposition

Abstract CdS quantum dots (QDs) coated TiO 2 nanorod arrays have been prepared via a two-step method. TiO 2 nanorod arrays were synthesized by a facile hydrothermal method, and CdS QDs were deposited on the nanorods by a sequential chemical bath deposition (S-CBD) technique. The surface morphology, structure, optical and photoelectrochemical behaviors of the core–shell nanorod array films are considered. A photocurrent of 2.5 mA/cm 2 , an open circuit photovoltage of 1.10 V, and a conversion efficiency of 1.91% were obtained under an illumination of 100 mW/cm 2 , when the CdS QDs deposited on TiO 2 nanorods film for about 7 cycles. The results demonstrate that the composite films are of excellence with respect to photovoltaic conversion.