294385.fig.002a
(a)
294385.fig.002b
(b)
294385.fig.002c
(c)
Figure 2: Surface morphology of porous GaAs etched with different types of etching solution for (a) sample A, (b) sample B, and (c) sample C, at current density, = ~25 mA/cm2, and time, = 10 min.