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. 2020 Aug 22;20(17):4754. doi: 10.3390/s20174754

Figure 12.

Figure 12

Proposed band structure model for 3D n-ZnO/p-NiO heterojunction (a) in air and (b) in NH3. (ECB, lower level of conduction band; EF, Fermi level; EVB, upper level of valence band).