Carrier Actions

What Actions?
Definitions
Drift Current
Diffusion Current
Mobility & Scattering
What causes band bending?
Recombination
Generation
Let's Draw!
Related Topics

Definitions

Band bending:
Occurs when the conduction band and the valence band become a function of position because of an electric field that exists inside a material. The result is a variation of Ec and Ev with position in the energy band diagram.
Current density:
Current is the charge per unit time crossing an arbitrarily chosen plane of observation oriented normal to the direction of current flow. Current density, J, is the current per unit area (J=I/A).
Diffusion:
The angular redistribution of radiation by a scattering, reflecting or refracting system, ideally producing an isotropic distribution of intensity. The gradual mixing of the molecules of two or more substances, as a result of random thermal motion.
Drift:
To be carried along by or as by currents of air or water. To vary from or oscillate randomly about a fixed setting, position, or mode of operation. To move leisurely or sporadically from place to place.
Equilibrium:
A condition in which all acting influences are canceled by others, resulting in a stable, balanced, or unchanging system. The condition of a system in which the resultant of all acting forces is zero and the sum of all torques about any axis is zero. The state of a reaction in which its forward and reverse reactions occur at equal rates so that the concentration of the reactants does not change with time.
Generation:
The act or process of generating, i.e. origination, production or procreation. We will use it as the process whereby electrons and holes are created.
Lifetime:
The period of time during which an individual is alive. The period of time during which an object, property, process, or phenomenon exists or functions.
Mobility:
Capable of moving or of being moved from place to place. Moving quickly from one place to another; flowing freely.
Perturbation:
To disrupt greatly; to agitate. Variation in a designated orbit, as of an electron or planet, resulting from the influence of one or more external bodies.
Radiation:
The act or process of radiating. The emission and propagation of waves or particles. The propagating waves or particles, such as light, sound, radiant heat, or particles, emitted by radioactivity.
Recombination:
We will use it in the context of it being the process whereby electrons and holes (carriers) are annihilated, or destroyed.
Resistivity:
The capacity for or tendency toward resistance. The resistance per unit length of a substance with uniform cross-section. Resistance is the opposition to electric current characteristic of a medium, substance, or circuit element.
Scattering:
The act or process of separation or dispersing. The dispersal of a beam of particles or of radiation into a range of directions resulting from physical interactions.
Thermal motion:
Motion due to temperature. Thermal is of, pertaining to, using, producing, or caused by heat.

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