Forward and reverse battery bias, Electrical Engineering

Assignment Help:

Forward and Reverse battery bias

In diagram below(a) the battery is arranged that is why the negative terminal supplies electrons to the N-type material. These types of electrons diffuse toward the junction. The positive terminal eliminates electrons from the P-type semiconductor, forming holes that diffuse toward the junction. If the battery voltage is sufficiently great to overcome the junction potential (0.6V in Si), the N-type electrons and P-holes merge annihilating each other. This frees up space in the lattice for more carriers to flow toward the junction. So, currents of P-type and N-type majority carriers flow in the direction of the junction. The recombination at the junction permits a battery current to flow via the PN junction diode. Such type of a junction is said to be forward biased.

1057_Forward and Reverse battery bias.png

Figure: (a) Forward battery bias repells carriers toward junction, where recombination results in battery current. (b) Reverse battery bias attracts carriers toward battery terminals, away from junction. Depletion region thickness increases. No sustained battery current flows.

If the battery polarity is inverted like in Figure above (b) majority carriers are attracted away from the junction in the direction of the battery terminals. The positive battery terminal attracts N-type majority carriers, electrons, away from the junction. The negative terminal attracts P-type majority carriers, holes, away from the junction. This raises the thickness of the non conducting depletion region. There is no recombination of majority carriers; so, no conduction. This arrangement of battery polarity is known as the reverse bias.


Related Discussions:- Forward and reverse battery bias

Economic analysis of hydropower, find the net value of power if an average ...

find the net value of power if an average value of energy is assumed to be $0.05/KWh, the capacity value is $30/kw-yr ...

Electrical fundamentals, Electrical Fundamentals 1. An aircraft compan...

Electrical Fundamentals 1. An aircraft company has decided to replace the copper cables to the main aircraft generators onboard it's Boeing 747s with aluminium cables that are

Bjt, what is compensation of bjt

what is compensation of bjt

Daa decimal adjust accumulator instruction , DAA Decimal Adjust Accumulator...

DAA Decimal Adjust Accumulator Instruction This  instruction adjusts the contents  of the accumulator  into BDC (Binary Coded Decimal )  form  after a BCD  addition. It should

Obtain the laplace transform of the waveform, Q. Use MATLAB to obtain the L...

Q. Use MATLAB to obtain the Laplace transform of the waveform f(t) = [200t e -25t + 10 e -50t sin(25t)]u(t) which consists of a damped ramp and a damped sine. Also show the

Requirement of a hybrid in telephone networks, Q. What is the requirement o...

Q. What is the requirement of a hybrid in telephone networks? How does it work? Ans: Digital exchanges require receive and transmit signals on separate two-wire circuits. Th

Describe the physical properties and uses of the brasses, Describe the phys...

Describe the physical properties and uses of the Brasses. Brass - It is an alloy of copper and zinc along with 60 percent copper and 40 percent zinc. Its properties are- 1.

State the significance of lock signal in 8086, State the significance of LO...

State the significance of LOCK signal in 8086? If 8086 is working at maximum mode, there are multiprocessors are there. If the system bus is given to a processor then the LOCK

Dc machine, why very high resistance wire is used is field windind and low ...

why very high resistance wire is used is field windind and low resistance wire is used in armature winding in DC shunt machine?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd