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Thank you, Berkeman. It's a stainless steel corrosion research in a lab. The passive films consist of Fe/Cr oxide, behave n-type semiconductor. One side of the passive film contact with stainless steel, the other side contact with aqueous solution. According to the Mott-Schottky measurement...

Hello! There're very thin (4-15 nm) semiconductor films (passive film) formed on stainless steel by electrochemical method. In a electrochemical cell, I applied potential on stainless steel electrode to adjust Fermi level of the semiconductor passive film. I think that band bending take place...