Nanostructures by Divalent Dissolution

In the potential range below the first maximum. Si dissolves by two charges only, according to 

A Si surface atom, preferably at a kink site, is oxidized by a hole from the valence band that is either potential induced (p-Si) or light generated (n-Si). The second charge is transferred by electron injection from a solution species into the Si conduction band. The region is characterized by porous Si formation [184—187] 

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