01․ The resistance of pn junction when it is forward biased in the order of
When the pn junction is forward biased the resistance would be in the order of Ohm. Because in forward biased condition the depletion layer is very small and breaks with small applied voltage.
02․ Electron mobility is defined as
<µ>=υ/E
03․ Which of the following does not obey the Ohm's law?
Semiconductors are non-linear device so it does no obey the ohm's law. The properties of a semiconductor changes with the change in direction of voltage and current.
04․ The room temperature resistivity of pure silicon is
05․ Acceptor type impurities
Acceptor impurities are also called trivalent impurity. Acceptor impurity accept the electrons and make P-type semiconductor material.
06․ Semiconductor material is
Semiconductor Materials have 4 electrons in outer most shell or in valance shell so it is called tetravalent.
07․ For Germanium pn junction, the maximum value of barrier potential is
When the pn junction is made a layer is formed between between P and N material which restrict the flow of current at a particular voltage level this layer breaks. The voltage required to break this layer is called barrier potential. The maximum value of barrier potential is .3V.
08․ When pn junction is reverse biased
When pn junction is reversed biased it does not conduct any current as it offers very high resistance. The width of the depletion layer increases but a small amount of leakage current flows due to the thermally generated minority carriers.
09․ Semiconductor Diode is used as
Diode conduct only in one direction when its anode voltage is greater than the cathode voltage. It is used to convert AC to DC. So semiconductor diode used as a rectifier.
10․ A semiconductor diode is
In semiconductor devices when voltage increases or decreases the current does not increases or decreases proportionately. So, semiconductor device does not obeys ohm's law. That is why semiconductor device is a non-linear device.
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