Actually the movement of charges from cb to vb or from ss to cb or from vb to ss due to illumination, changes the band bending which is monitored in Surface Photovoltage (SPV) technique. Actually physics is hidden there so I want to be clear about that.
VB=valence band CB=conduction band
when the energy of incident light, hf≥ band gap energy, super band gap illumination takes place.
The surface between a semiconductor and vacuum or gas is referred as a free surface or just surface.
The termination of periodic structure of...
Hi all,
when we shine light on semiconductor surface with white light, superband gap transition occurs (VB to CB). Also we have surface state (SS) too, so there is probability of transition from VB to SS and SS to CB as well. The time transient of this surface is similar to charging of a...