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# DFCCIL EE/EC EDC QUIZ - 2

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Question 1

A metal-semiconductor junction is taken. The variation of the electric field inside the semiconductor is shown in the figure below

The built-in potential of the diode is _____V.

Question 2

Considersilicon diode at. The slope of the diffusion capacitance versus forward bias current is. The hole lifetime is _______.

(Assume forward bias current)

(Assume forward bias current)

Question 3

The built-in potential for a silicon p-n junction diode with N

(Given intrinsic carrier concentration n

_{D}= 10^{14}cm^{-3}and N_{A}= 10^{17}cm^{-3}for T=300K will be ___V?(Given intrinsic carrier concentration n

_{i}=1.510^{10}cm^{3}).Question 4

Consider an abrupt PN junction (at T = 300 K) shown in the figure. The depletion region width X

_{n}on the N-side of the junction is 0.2 μm and the permittivity of silicon**(ε**is_{si})**1.044x10**At the junction, the approximate value of the peak electric field (in kV/cm) is _________.^{-12}F/cmQuestion 5

Consider an ideal silicon P-N junction diode with the following parameters

The ratio of so that 95% of current in depletion region is carried by electron is

The ratio of so that 95% of current in depletion region is carried by electron is

Question 6

A particular green LED emits light of wavelength 5490^{o}A. The energy band gap of the semiconductor material used there is **(**Planck’s constant = 6.625x10^{-34} J-s.**)**

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Jun 30ESE & GATE EC

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V V Satya Narayana MadasuMember since Sep 2020

Gate Qualified in 2018,2019,2020,2021| ISRO Exam qualified| AIR -672|Completed M.Tech in VLSI Design