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प्रश्न
What is a semiconductor?
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उत्तर
The solids whose conductivity lies between those of metals and insulators are called semiconductors. The conductivity of semiconductors usually lies in the range of 10−6 to 104 ohm−1 m−1. The conductivity of semiconductors is mainly determined by the impurities and defects.
संबंधित प्रश्न
A group 14 element is to be converted into n-type semiconductor by doping it with a suitable impurity. To which group should this impurity belong?
Describe the two main types of semiconductors and contrast their conduction mechanism.
Non-stoichiometric cuprous oxide, Cu2O can be prepared in laboratory. In this oxide, copper to oxygen ratio is slightly less than 2 : 1. Can you account for the fact that this substance is a p-type semiconductor?
Classify each of the following as being either a p-type or a n-type semiconductor:
- Ge doped with In
- B doped with Si
Explain the following with suitable examples:
12-16 group compounds
What type of semiconductor is obtained when
Si is doped with P?
Solids with conductivities ranging from 104 to 107 ohm-1 m-1 are ____________.
Semiconductors have conductivity (in ohm-1 m-1) in the range of ____________.
The process by which impurity is introduced in semiconductors to enhance its conductivity is known as ____________.
Silicon doped with electron-rich impurity forms ______.
Which of the following statements are true about semiconductors?
(i) Silicon doped with electron-rich impurity is a p-type semiconductor.
(ii) Silicon doped with an electron-rich impurity is an n-type semiconductor.
(iii) Delocalised electrons increase the conductivity of doped silicon.
(iv) An electron vacancy increases the conductivity of n-type semiconductor.
Why are solids incompressible?
Why does the electrical conductivity of semiconductors increase with rise in temperature?
Assertion: Semiconductors are solids with conductivities in the intermediate range from 10–6 – 104 ohm–1m–1.
Reason: Intermediate conductivity in semiconductor is due to partially filled valence band.
Silicon is a/an ______
