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 Capacitor-Fed, Voltage-Step-Down, Single-Phase, Non-Isolated Rectifier

working principle of crtand block diagram of cro

why we plot graph to find bandwidth is drawn b/w av/avmax v/s frequency not av v/s frequency?

Q. (a) Obtain a Thevenin equivalent circuit at terminals A-B in the circuit. (b) What impedance ¯ZL, when connected to A-B, produces maximum power in ¯ZL? (c) Find the val


At the completion of this unit, you will be able to determine the cutoff frequencies and attenuations of RC and RL low- and high-pass filters by using test circuits. UNIT FUNDA

Describe hall effect?also describe it''s mathematical analysis and it''s properties

Can I have formulas for calculation of 50TN seting on 33KV overhead line

Q. Explain about Simplex communication? Simplex communication: Microphone and the earphone are transducer elements of the telephone communication system. Microphone converts

Define Time-Shifting Precedes Time-Reversing and Vice Versa Signal x[n] is time-shifted by m samples (delay in time) giving x[n - m]. This signal is then reversed at n = 0 givi