EASY

Earn 100

Draw the energy band diagram when intrinsic semiconductor $(Ge)$ is doped with impurity atoms of Antimony $(Sb)$ . Name the extrinsic semiconductor so obtained and majority charge carriers in it.

Important Questions on Semiconductor Devices and their Applications

EASY

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

The conductivity of semiconductor increases with increase in temperature because

EASY

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

As the temperature of the semiconductor is increased, the mobility of electrons and holes

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Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

In an intrinsic semi conductor at room temperature number of electrons and holes are

EASY

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

An intrinsic semiconductor is converted into

n

-type extrinsic semiconductor by doping it with:-

MEDIUM

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

The conductivity of a semiconductor sample having electron concentration of

5 \times 10^{18} electrons m^{- 3}

, hole concentration of

5 \times 10^{19} holes m^{- 3}

, electron mobility of

2 .0 m^{2} V^{- 1} s^{- 1}

and hole mobility of

0.01 m^{2} V^{- 1} s^{- 1}

is

(Take charge of an electron as

1 .6 \times 10^{- 19} C

)

EASY

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

For a

p -

type semiconductor, which of the following statements is true?

EASY

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

In a semiconductor, the conductivity increases with the increase in temperature due to

EASY

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

In a semiconductor, the concentration of minority carriers depends mainly on

EASY

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

In a semiconductor crystal, if the current flows due to breakage of crystal bonds, then the semiconductor is called:

HARD

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

In a semiconductor, the number density of intrinsic charge carriers at

27 ° C

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

. If the semiconductor is doped with an impurity atom, the hole density increases to

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

. The electron density in the doped semiconductor is _______

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

EASY

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

A donor impurity results in

EASY

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

An intrinsic semiconductor is:

MEDIUM

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

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

MEDIUM

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

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

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

For extrinsic semiconductors; when doping level is increased;

EASY

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

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

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

An extrinsic semiconductor with electrons as majority carriers can be obtained by doping Ge or Si with

EASY

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

The intrinsic carrier concentration of silicon sample at

300 K

1.5 \times 10^{16} / m^{3} .

What is the density of minority carrier? (after doping, the number of majority carriers is

5 \times 10^{20} / m^{3})

EASY

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

Which of the following statements is incorrect?

EASY

Physics>Modern Physics>Semiconductor Devices and their Applications>Semiconductor Doping - Intrinsic and Extrinsic Semiconductors

At a certain temperature, the number density of charge carriers in a semiconductor is

n

. When an electric field is applied to it, the charge carriers drift with an average speed

v

. If the temperature of the semiconductor is raised.

Draw the energy band diagram when intrinsic semiconductor (Ge) is doped with impurity atoms of Antimony (Sb). Name the extrinsic semiconductor so obtained and majority charge carriers in it.

Important Questions on Semiconductor Devices and their Applications

Learn and Prepare for any exam you want !

Draw the energy band diagram when intrinsic semiconductor $(Ge)$ is doped with impurity atoms of Antimony $(Sb)$ . Name the extrinsic semiconductor so obtained and majority charge carriers in it.