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|GDB Topic & date||Dated: Jan 30, 14|
Graded MDB will be opened on 6th Feb 2014 at 12:00am. This discussion board will be closed on 7th Feb 2014 at 11:59pm.GDB will remain open for 48 hours. It is important for every student to take part in this discussion board. Your comments will be graded, which is worth 5% of your total marks.
The topic is:
“Tell the type of materials in which we can make control over charge carriers. Describe the current types in such materials and their respective directions”.
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Charge Carriers in Semiconductors
Semiconductors used to control charge carriers (hole and electrons).
after doping of pentavalent and trivalent impurities in pure semi conductor we get N-type and P-type material respectively. Electrons are majority carriers in N-type and holes are in P-type. Elctron diffuse from N to P side and hole from P to N side. both add and form diffusion current.
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