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SEM images of nanoscale structures in the laser scanning tracks on the surface of following irradiation at a fluence of with scanning speeds of (a) 2000, (b) 600, (c) 400, and (d) , respectively.
(Color online) Corresponding relationship between the scanning speed and the number of pulses applied on unit area and their corresponding dominated structures. Inset: overview of surface morphology of laser-structured captured by a digital camera. The fluences are 3.6 and for the upper left and the lower right structured areas, respectively.
(Color online) (a) Absorption spectra before and after laser nanostructuring under increased fluence. Inset: dependence of enhanced absorption on laser fluence. (b) Spectral reflectivity before and after laser nanostructuring under increased fluence. The reflectivity of as-grown sample is 18.4%. (c) Comparison of photocurrent between unstructured and structured areas under the same illumination conditions.
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