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SEM images of as grown porous showing the top (a) and the cross-sectional (b) view of a thick self-organized porous layer.
XRD patterns of porous (a) before and (b) after annealing in air at for . The peak for the tungsten substrate in the annealed sample (b) is annotated (211); .
Photocurrent response for compact and porous layers. Shown are spectra measured at for compact and porous , for an as grown sample (a) and after annealing at (b). The insets show vs plots measured at for both samples.
Voltage dependence of the IPCE measured at a wavelength of during a voltage sweep from with the sweep rate of for annealed compact and annealed porous .
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