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Periodically patterned co-integration of silicon microwires (MWs) and nanowires (NWs) were applied for a novel photo-voltaic (PV) nanodevice. The optical improvement due to antireflection enhancement with a graded-refractive-index (GRI) effect (see Fig. 1) was observed by employing the tapered NWs. Si MWs that formed a radial p-n junction were located in between the dense array of Si NWs. These wire...
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