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प्रश्न
Answer in detail.
Distinguish between intrinsic semiconductors and extrinsic semiconductors.
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उत्तर
| Sr. No. | Intrinsic semiconductors | Extrinsic semiconductors |
| i. | A pure semiconductor is known as intrinsic semiconductors. | The semiconductor, resulting from mixing of impurity in it, is known as extrinsic semiconductors |
| ii. | Their conductivity is low at room temperature | Their conductivity is high even at room temperature. |
| iii. | Its electrical conductivity is a function of temperature alone. | Its electrical conductivity depends upon the temperature as well as on the quantity of impurity atoms doped in the structure. |
| iv. | The number density of holes (nh) is the same as the number density of free electron (ne) (nh = ne). |
The number density of free electrons and the number density of holes are unequal. |
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संबंधित प्रश्न
Let np and ne be the numbers of holes and conduction electrons in an extrinsic semiconductor.
Let nh and ne be the number of holes and conduction electrons respectively in a semiconductor. Then ______.
In a semiconductor, the number of holes and number of free electrons are represented as 'nh' and 'ne' respectively. Which one of the following statements is TRUE for the semiconductor?
Explain the following term:
Intrinsic semiconductor
An intrinsic semiconductor has a resistivity of 0.50 Ω m at room temperature. Find the intrinsic carrier concentration if the mobilities of electrons and holes are 0.39 m2V-1S-1 and O.11 m2 v-1S-1 respectively:
Two crystals C1 and C2, made of pure silicon, are doped with arsenic and aluminium respectively.
Why is doping of intrinsic semiconductors necessary?
Name the two types of atoms used for doping of Ge/Si.
A pure semiconductor has equal electron and hole concentration of 1016 m-3. Doping by indium increases nh to 5 × 1022 m-3. Then, the value of ne in the doped semiconductor is ______.
Answer the following giving reasons:
Impurities are added to intrinsic semiconductors.
Identify the WRONG statement from the following. In an intrinsic semiconductor ______.
What is a semiconductor?
Which materials are common examples of semiconductors?
What is an intrinsic semiconductor?
What happens when some valence electrons gain enough energy as temperature increases?
How does the conductivity of an intrinsic semiconductor change when temperature rises?
What must electrons cross to become free charge carriers as the temperature rises?
What first enables a valence electron to move to the conduction band?
Which charge carriers contribute to conduction in an intrinsic semiconductor?
How does the conductivity of an intrinsic semiconductor compare with that of an extrinsic semiconductor?
Which pairing correctly identifies examples of intrinsic and extrinsic semiconductors?
What does a classroom in which every student is seated represent in the description of a semiconductor at very low temperature?
Why are pure semiconductors not usually used directly in most electronic devices?
