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
Compare memory mapped I/O with I/O mapped I/O. Memory Mapped I/O Scheme: In this type of scheme there is merely one address space. These address space is explained as all p

why DC motors use field winding instead of armature winding

Q. What is the significance of source gate cutoff voltage? The source gate cutoff voltage is also called pinch off voltage. It is obtained when VDS increases and approaches a l

Achieving reforms goals using GIS applications: GIS could help in achieving the above reforms goals through various applications: •  Creation of consumer database and cons

(a) In the so-called folded binary code of 4 bits, the left most digit represents the sign of an analog signal's quantized samples (with 0 for negative and 1 for positive), and the

Power Spectral Density: To introduce the Power Spectral Density (PSD) of a random signal. To study classical methods for PSD estimation. To investigate model-based

Discuss the function of instruction queue in 8086? In 8086, a 6-byte instruction queue is presented at the Bus Interface Unit (BIU). It is used to pre fetch and store at the ma

Q. Show Quantization process Let Figure (a) illustrate a message f (t) with values between 0 and 7 V. A sequence of exact samples taken at uniform intervals of time is shown: 1

what is the difference between statically and dynamically induced emf?

Draw a graph illustrating how resistivity varies with temperature for an intrinsic semiconductor. b) Gallium nitride, GaN, has an energy gap of 3.36 eV at 300 K. Calculate the w