An Investigation of Nanocrystalline and Electrochemically Grown Cu₂ZnSnS₄ Thin Film Using Redox Couples of Different Band Offset

Figure 7

3D topography of CZTS film (area ~50 μ × 50 μ). (a) Before electrochemical test in europium nitrate aqueous solution, (b) After electrochemical test in europium nitrate solution. (c) After electrochemical test in oxalic acid aqueous solution. (d) Before electrochemical test in formaldehyde aqueous solution. (e) After electrochemical test in formaldehyde aqueous solution. (f) After electrochemical test in sodium sulfite aqueous solution.

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