Key
Points
- Generation is the creation of a conduction
electron Requires energy light/heat.
- Recombination is the elimination of a hole and/or
electron. Produces light/heat.
- Direct excitation is when no change in momentum is
needed.
- Indirect requires a phonon/electron/photon
interaction -- very unlikely
- Absorption is characterised by single paramater --
alpha
- Traps - midband gap levels that enhance R and G
Questions
- What type of elecron transistions are possible in
a semiconductor?
- Which is more likely to occur under illumination?
- What is a trap?
- How do we model optical absorption? What causes it?
- What are traps bad for devices?