MCQ
When semiconductor is doped half with trivalent and half with pentavalent impurities, junction formed is known as:
- ✓$pn$ junction
- Bbarrier junction
- Cpotential barrier
- Dboth $a$ and $b$
✓
Answer
Correct option: A.
$pn$ junction
As pentavalent impurities contribute or donate electrons to the semiconductor, these are called donor impurities and similarly as these impurities contribute negative charge carriers in the semiconductor this we refer as $n -$ type impurities. The semiconductor doped with $n -$ type impurities is called $n-$ type semiconductor.
Since trivalent impurities contribute excess holes to semiconductor crystal, and these holes can accept electrons, these impurities are referred as acceptor impurities. As the holes virtually carry positive charge, the said impurities are referred as positive $-$ type or $p -$ type impurities and the semiconductor with $p-$ type impurities is called $p-$ type semiconductor.
Since trivalent impurities contribute excess holes to semiconductor crystal, and these holes can accept electrons, these impurities are referred as acceptor impurities. As the holes virtually carry positive charge, the said impurities are referred as positive $-$ type or $p -$ type impurities and the semiconductor with $p-$ type impurities is called $p-$ type semiconductor.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
More "M.C.Q (1 Marks)" from Semiconductor Electronic: Material, Devices And Simple Circuits→Semiconductor Electronic: Material, Devices And Simple Circuits — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→
Similar questions
The work function of a metal is $2.3\, eV$ and the maximum kinetic energy of photo electrons is $0.3\, eV$ when photon is incident on it. Find the wavelength of incident photon.............. $\mathop {\rm{A}}\limits^o $
→The figure represents a voltage regulator circuit using a Zener diode. The breakdown voltage of the Zener diode is $6\,V$ and the load resistance is $R_L= 4\,k\Omega .$ The series resistance of the circuit is $R_i = 1\,k\Omega .$ If the battery voltage $V_B$ varies from $8\,V$ to $16\,V,$ what are the minimum and maximum values of the current through Zener diode?
→A plane glass is kept over a coloured word '$VIBGYOR$', where colour of letters as same as the colours in white light start by letter, the letter which appears least raised is
→Fusion reactions take place at high temperature because:
In L-R circuit, for the case of increasing current, the magnitude of current can be calculated by using the formula
If ${N_P}$and ${N_e}$be the numbers of holes and conduction electrons in an extrinsic semiconductor, then
→There exists an electric field of $1N/C$ along $Y$ direction. The flux passing through the square of $1m$ placed in $XY$ plane inside the electric field is?
→The number of electrons made available for conduction by dopant atoms depends strongly upon
Ten grams of $^{57}Co$ kept in an open container beta$-$decays with a half$-$life of $270$ days. The weight of the material inside the container after $540$ days will be very nearly:
→Astigmatism (for a human eye) can be removed by using