Synthesis of ZnO-TiO2 core-shell nanowire arrays and application in quantum dots sensitized solar cells

• 1、Electronic Materials Research Laboratory, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049

Abstract：TiO2 shell layer on the surface of ZnO nanowires (NWs) was synthesized by a layer by layer adsorption and reaction (LBLAR) method. The prepared ZnO-TiO2 core-shell NW arrays have a similar morphology with the well-aligned ZnO core NW arrays. The prepared ZnO-TiO2 core-shell NW arrays were sensitized with CdS quantum dots to assemble quantum dots sensitized solar cells. Results indicate that 7nm thick TiO2 shell can be prepared on ZnO nanowire surface after 20 times LBLAR, and a dramatic increase in open-circuit voltage and fill factor is achieved for the ZnO-TiO2 core-shell device, resulting in a substantial improvement of the overall energy conversion efficiency.A rapid electron transfer from the CdS QDs to the ZnO NWs and a reduced electron recombination rate due to the energy barrier occurred at the interface between the ZnO core and the TiO2 shell are believed to contribute to the improved performance.

Keywords： ZnO TiO2 core-shell nanorod QDSSCs