Abstract
A novel three dimensional (3D) cellular network structured TiO2 film is developed for CdS/CdSe quantum dots sensitized solar cells (QDSSCs). The vertically net-connected hollow TiO2 photoanode is synthesized via a stepwise hydrothermal method. Benefiting from the hierarchical architecture, the specific surface area is dramatically enhanced thus allowing for loading more quantum dots. Besides, the optical characteristic results demonstrate that the light scattering ability is improved which could be ascribed to the easily trapped incident light in the cellular net-connected TiO2. Furthermore, the one dimensional (1D) structure inherited from nanorods arrays provides direct channels for electron transport accompanied with less recombination. The measured power conversion efficiency (PCE) of the QDSSCs based on this cellular TiO2 photoanode is 4.54%, which is 2.2 times higher than that of the QDSSCs based on the original TiO2 nanorods photoanode. The enhanced photovoltaic performance is ascribed to the higher light harvesting efficiency, improved light scattering property and promoted electron transport. The net-connected photoanode with 1D structure could offer the design of tailored architecture targeting various solar cells.
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