Semiconductor Material

IMPORTANT

Semiconductor Material: Overview

This topic talks about semiconductors. Types of semiconductors are intrinsic and extrinsic semiconductors. Further, n-type and p-type semiconductors are also explained in detail.

Important Questions on Semiconductor Material

EASY
IMPORTANT

In a pure semiconductor, electric current is due to_________.

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IMPORTANT

In a p–type semiconductor, the concentration of holes is2 × 1015 cm-3  The intrinsic carrier concentration is2 × 1010 cm-3 . The concentration of electrons will be.

MEDIUM
IMPORTANT

Assertion : An n-type semiconductor has a large number of electrons but still it is electrically neutral.

 Reason : An n-type semiconductor is obtained by doping an intrinsic semiconductor with a pentavalent impurity. 

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How current is conducted in intrinsic semiconductor?

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In an intrinsic semiconductor, the number of free electrons equals the number of holes.

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The probability of electrons to be found in the conduction band of an intrinsic semiconductor at finite temperature is which of the following?

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When the electrical conductivity of a semiconductor is due to the breaking of its covalent bonds, then the semiconductor is said to be

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Which of the following is the best conductor of electricity?

MEDIUM
IMPORTANT

The mobility of free electrons is greater than that of free holes because

HARD
IMPORTANT

Describe the conduction band and valence band in semiconductors.

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The mobility of conduction electrons is greater than that of holes, since electrons

EASY
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Define electron motion in a semiconductor.

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The truth table of a logic gate is given as

Input Output
1 0
0 1

What is the gate?

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The probability of electrons to be found in the conduction band of an intrinsic semi-conductor at a finite temperature

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Explain the electric current due to electrons in an intrinsic semiconductor.

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At absolute zero temperature, intrinsic Germanium and intrinsic Silicon are

HARD
IMPORTANT

Calculate the electric current generated in an intrinsic germanium plate at room temperature whose area is 2×10-4 m2 and width is 1.2×10-3 m and a potential difference of 5 V is applied across its faces. Intrinsic charge carrier density is 1.6×106/m3 for germanium at room temperature. The mobility of electrons and holes is 0.4 m2V-1s-1 and 0.2 m2V-1s-1.

EASY
IMPORTANT

At absolute zero temperature intrinsic Germanium and intrinsic Silicon, are

HARD
IMPORTANT

At room temperature in intrinsic Silicon the number of charge carriers per unit volume is 1.6×1016/m3. If mobility of electrons is 0.150 m2 V-1 s-1 and mobility of holes is 0.05 m2 V-1 s-1. Then conductivity of silicon is Ωm is