Figure 4.

Time-dependent voltage of the piezoelectric transducer. Structural parameters of the porous silicon layers are (a) lpor = 50 μm and ε = 65%; (b) lpor = 30 μm and ε = 65%; (c) lpor = 50 μm and porosity ε = 60%; and (d) lpor = 30 μm and ε = 60%

Andrusenko et al. Nanoscale Research Letters 2012 7:411   doi:10.1186/1556-276X-7-411
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