Fabrication of CdSe/CdTe Quantum Dots Co-Sensitized TiO₂Nanorods by Electrochemical Atomic Layer Deposition Method

Abstract

In this paper, uniformly distributed CdSe and CdTe quantum dots (QDs) are deposited simultaneously on the surface of TiO 2 nanorods via electrochemical atomic layer deposition (ECALD) method. XRD and TEM characterization confirm that the deposits are the composite of CdSe and CdTe QDs. SEM observation presents that the co-sensitized QDs cover homogenously both on the top and side surface of TiO 2 nanorods, and the EDX composition analysis suggests that the ratio of Cd to Se and Cd to Te is approximate 1:1, indicating that ECALD can control the deposition of each element well. In comparison with the CdSe or CdTe QDs sensitized photoanodes, the photo absorption range of the CdSe/CdTe co-sensitized QDs photoande is greatly broadened, and a power conversion efficiency of 2.01% with a short-circuit current density of 6.59 mA/cm 2 at AM 1.5 solar light of 100 mW/cm 2 is achieved for the CdSe/CdTe QDs co-sensitized solar cells.