CdS/CdSe cosensitized oriented single-crystalline TiO2 nanowire array for solar cell application

Vertically oriented single-crystalline TiO2 nanowires array was grown on transparent conductive oxide glass substrate, and then CdS and CdSe quantum dots (QDs) were deposited on nanowires to form a TiO2/CdS/CdSe core-shell structure films. The optical properties of films with different layers of QDs were compared. The QD sensitized solar cells (QD-SSCs) were assembled and the effect of coating cycles of QDs on the photovoltaic performance was investigated. Under optimum parameters, QD-SSCs assembled with 5 mu m thick TiO2 nanowires film exhibited a short-circuit current density of 7.92 mA cm(-2), an open-circuit voltage of 0.40 V, and a power conversion efficiency of 1.14%. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3503409]