Drift current and diffusion current, Electrical Engineering

Drift Current and Diffusion Current :

There are two mechanisms in which electrons and holes move through a semiconductor. One of these is termed as drift and other is diffusion. When the movement of charge carries is under the influence of an applied electric field, the resultant current is termed as drift current. A second type of current, called the diffusion current, also exists in a semiconductor. The diffusion of charge carriers is as a result of a gradient of carrier concentration. In this case concentrations of charge carriers tend to distribute themselves uniformly throughout the semiconductor crystal. This movement continues until all the carries are evenly distribute themselves uniformly throughout the semiconductor crystal. This movement continues until all the carriers are evenly distributed throughout the material. The type of movement of charge carriers is called the diffusion current. Both drift and diffusion occur simultaneously in a semiconductor device.

Posted Date: 2/8/2013 2:46:46 AM | Location : United States







Related Discussions:- Drift current and diffusion current, Assignment Help, Ask Question on Drift current and diffusion current, Get Answer, Expert's Help, Drift current and diffusion current Discussions

Write discussion on Drift current and diffusion current
Your posts are moderated
Related Questions
(a) Now consider a typical open-wire transmission line with parameters of R = 14 /mi, L = 4.6 mH/mi, C = 0.01 µF/mi, and G = 0.3×10 -6 S/mi. If the line operates at 1 kHz, find t

A zipper has N links every link has a state in which it is closed with energy 0 and a state in which it is open with energy 0 We require that the zipper only unzip from one side (s

Explain relative data addressing mode (with examples) available in microprocessors. Relative Mode: Operand supplied is an offset, not the actual address. Added the con

how to implement monostable delay in matlab simulink environment? mailtoinayath@gmail.com

GIS Based Mapping of Electrical Network: You have learnt in which the Geographic Information System is a system of mapping of the complete electrical network. The question we

Submit a brief report on the selection of two commercially available sensors for the following: • Research and recommend a sensor for a real full size conveyor system of approxima

A communication system for a voice-band (3 kHz) channel is designed for a received SNR E b /N 0 at the detector of 30 dB when the transmitter power is Ps =-3 dBW. Find the value o

To have the same value of P e , show that E b /N 0 in a coherent-ASK system has to be twice that in a coherent PSK system.

Define the Signals in Time Domain? The time domain is the type of visualization that most people are familiar with. This method shows variations of a signal with time. The most

Example of Registers Example : Write  the instruction to copy  data byte 24H  stored  in register C to register B  Solution : The instruction to copy  data byte  is  a