Figure 1.

SEM image of ZnO nanotubes on p-GaN substrate. (a) before annealing, (b) after annealing, (c) typical I-V characteristics for the fabricated LEDs, and (d) The schematic illustration of the fabricated LEDs.

Alvi et al. Nanoscale Research Letters 2011 6:130   doi:10.1186/1556-276X-6-130
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