|
|
|
|
 |
 | |  |
| In the first process, an electron in the valence band gains energy by absorbing a photon, exciting it to a higher energy level..... | |
 | |  |
|
|
|
|
|
|
|
|
|
| | |
| within the conduction band. The energy gained by the electron is equal to the energy of the photon..... | |
| | |
|
|
|
|
|
|
|
 |
| | |
| Not all the electrons interact with the photons of light. The rate that electrons will be absorbed is determined by the number of unoccupied states in the conduction band, the number of occupied state | |
| | |
|
|
|
