Journal of Sensors / 2009 / Article / Fig 7

Review Article

Receptor Function and Response of Semiconductor Gas Sensor

Figure 7

Model for electron tunneling across a gap between SnO2 grains [13]. (a) Flat band condition, (b) Bent band condition. 𝑉 : Wall height V.L.: Vacuum level, C.B.: Conduction band, F.B.: Forbidden band, V.B.: Valence band.

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