31. Roughly, the "'HOMO "'level is to organic semiconductors what the valence band maximum is to inorganic semiconductors and quantum dots. 32. As bias increase, the valence band of the p-side gets pulled down, and so did the hole quasi Fermi level. 33. When the bismuth is doped with antimony, the conduction band decreases in energy and the valence band increases in energy. 34. An important aspect of HEMTs is that the band discontinuities across the conduction and valence bands can be modified separately. 35. Conduction band electrons ( e " ) and valence band holes ( h + ) form in the compounds'structure. 36. Photons knock electrons from the valence band into an energy level called the conduction band, where they form an electric current. 37. The technique can also be used to study relaxation of electrons from the conduction band to the valence band in semiconductors. 38. The left panels show the lowest energy level of the conduction band and the highest energy level of the valence band . 39. Electrons in a solar cell absorb photon energy in sunlight which excites them to the conduction band from the valence band . 40. As electrons stabilise at various energy levels, most vibrate in valence bands below a forbidden energy level, named the band gap.
