294385.fig.006a
(a)
294385.fig.006b
(b)
294385.fig.006c
(c)
294385.fig.006d
(d)
Figure 6: Surface morphology of porous GaAs with variation of current density of (a) 25 mA/cm2 (sample C), (b) 250 mA/cm2 (sample E), (c) 350 mA/cm2 (sample G), and (d) 250 mA/cm2 with improvement in current conductivity (sample H), at etching time,  min.