Space charge | Wikipedia audio article
Channel: wikipedia tts
Date: 30/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Space_charge


00:01:02 1 Cause
00:01:11 1.1 Physical explanation
00:02:42 1.1.1 Hetero and homo charge
00:03:15 1.2 Mathematical explanation
00:05:05 2 Occurrence
00:05:21 3 Space-charge-limited current
00:05:40 3.1 In vacuum (Child's law)
00:06:46 3.2 In semiconductors
00:08:31 3.2.1 Drift regime (The Mott Gurney law)
00:08:41 3.2.2 Low voltage regime
00:11:09 3.2.3 Saturation regimes
00:12:06 4 Shot noise
00:19:22 5 See also
00:20:29 6 References
00:22:18 Shot noise
00:23:09 See also



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SUMMARY
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Space charge is a concept in which excess electric charge is treated as a continuum of charge distributed over a region of space (either a volume or an area) rather than distinct point-like charges. This model typically applies when charge carriers have been emitted from some region of a solid—the cloud of emitted carriers can form a space charge region if they are sufficiently spread out, or the charged atoms or molecules left behind in the solid can form a space charge region. Space charge usually only occurs in dielectric media (including vacuum) because in a conductive medium the charge tends to be rapidly neutralized or screened. The sign of the space charge can be either negative or positive. This situation is perhaps most familiar in the area near a metal object when it is heated to incandescence in a vacuum. This effect was first observed by Thomas Edison in light bulb filaments, where it is sometimes called the Edison effect, but space charge is a significant phenomenon in many vacuum and solid-state electronic devices.