Hierarchical ZnO rod-in-tube nano-architecture arrays produced via a two-step hydrothermal and ultrasonication process: Dye-sensitized solar cells based on hierarchical ZnO rod-in-tube nano-architectures are 75% more efficient than similar solar cells that just use ZnO nanorods. The ZnO rod-in-tube nano-architecture arrays were created via a two-step hydrothermal and ultrasonication procedure developed by scientists at Sun Yat-sen University, China. The team attribute the greater efficiency to the larger surface area of the rod-in-tube array.
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