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order of nanometers as shown in Fig. 8.19(6c). The large pores can be fully or partially
filled by the small pores as shown in Fig. 8.19(4a
c).
The morphology of the PS formed on
n
-Si also strongly depends on illumination
conditions, that is, intensity, frequency, and direction (front or back). Very different
morphologies are produced by front versus back illumination. Back illumination gen-
erally produces straight pores, whereas front illumination typically produces a two-layer
PS as shown Fig. 8.19(6c).
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