Solid state electronics (II)

1. drifting current

When a certain electric field is applied to a semiconductor, the current flows through the semiconductor. When a particle with a dot moves in the electric field, the resulting current becomes the drifting current.

 

2. Mobility

When the electric field strength is low, the carrier's drift speed V is proportional to the electric field strength E. The proportional constant is called the mobility.

 

3. Rate saturation

The carrier speed cannot increase infinitely and cannot exceed the speed of light. For Si, the linear relationship of rate-electric field is only applicable when the electric field strength is less than 5000 V/micron. When the electric field strength exceeds 5000 V/micron, both the electron rate and the hole rate reach saturation.

 

 

4. Resistivity of intrinsic Silicon

The total drift current density is the sum of the drift current density of electrons and holes.

Solid state electronics (II)