Match the following: i Ge doped with In 1 . n-type semiconductor ii Si doped with N 2 . Schottky defect iii ZnS 3 . p-type semiconductor iv CsCl 4 . Frenkel defect

i − 3 , ii − 1 , iii − 4 , iv − 2

i − 1 , ii − 3 , iii − 2 , iv − 4

i − 1 , ii − 3 , iii − 4 , iv − 2

i − 3 , ii − 1 , iii − 2 , iv − 4

What type of semiconductor is obtained when silicon is dopedwith boron

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

Statement I: By doping silicon semiconductors with pentavalent material, the electrons density increases.

Statement II: The $n -$ type of semiconductor has a net negative charge.

In the above statements, choose the most appropriate answer from the options given below:

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

The density of an electron-hole pair in pure germanium is

3 \times 10^{16} m^{- 3}

at room temperature. On doping with aluminium, the hole density increases to

4.5 \times 10^{22} m^{- 3}

. Now the electron density (in

m^{- 3}

) in doped germanium will be

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

The electron concentration in an undefined

n

-type semiconductor is the same as hole concentration in a undefined

p

-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

Which of the following does not give

p -

type properties to a semiconductor when used as a doping agent?

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

An intrinsic semiconductor is converted into

n

-type extrinsic semiconductor by doping it with:-

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

In

n -

type silicon, which of the following statements is true?

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

Silicon doped with Arsenic is

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

The majority charge carriers in P-type semiconductors are

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

In the following circuit diagram, the current through the battery is

Question Image

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

Silicon doped with gallium forms

HARD

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

Match the following:

$i$	$Ge$ doped with $In$	$1 .$	n-type semiconductor
$ii$	$Si$ doped with $N$	$2 .$	Schottky defect
$iii$	$ZnS$	$3 .$	p-type semiconductor
$iv$	$CsCl$	$4 .$	Frenkel defect

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

The barrier potential of a p-n junction depends on:

(a)

type of semi-conductor material

(b)

amount of doping

(c)

temperature
Which one of the following is correct?

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

In the following figure, identify the diodes which are reverse biased

(A)

Question Image

(B)

Question Image

(C)

Question Image

(D)

Question Image

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

Which of the following statement is false?

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

Identify a false statement from the following

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

To get p-type semiconductor, impurity to be added to silicon should have which of the following numbers of valence electrons?

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

A semiconductor has equal electron and hole concentration

6 \times 10^{8} m^{- 3}

. On doping with a certain impurity electron concentration increases to

9 \times 10^{12} m^{- 3}

. Calculate the new hole concentration. Also identify the new semiconductor.

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

A donor impurity results in

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

The contribution to the total current in a semiconductor, due to electrons and holes are

0.75

and

0.25

respectively. The drift velocity of electrons is

\frac{3}{2}

times that of holes at this temperature. Then the ratio between electron concentration and hole concentration is

EASY

Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

In an unbiased p - n junction electrons diffuse from n-region to p-region because:

What type of semiconductor is obtained when silicon is doped with boron?

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