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

Give illustration of and and or gate - microprocessor, Give Illustration of...

Give Illustration of AND and OR Gate - Microprocessor? Illustration: The image below demonstrate the 4 possible inputs into a 2-input AND gate and all the corresponding outputs

What is asynchronous data transfer, What is asynchronous data transfer? ...

What is asynchronous data transfer? It is a data transfer method which is used when the speed of an I/O device does not match with the speed of the microprocessor. Asynchronous

Can you explain octal to binary conversion, Q. Can you explain Octal to Bin...

Q. Can you explain Octal to Binary Conversion? It is also simple to convert from an integer octal number to binary. This is completed by: Convert the decimal number

Drain characteristics of fet, Q. In The Drain Characteristics Of FET What D...

Q. In The Drain Characteristics Of FET What Does The Region At Pinch Off? Field Effect Transistors (FETs) utilize a conductive channel whose resistance is controlled by an appl

Wye -delta conversion, how to write theory background on practical about t...

how to write theory background on practical about this topic.

Which stack is used in 8086, FIFO (First in First Out) stack is used in 808...

FIFO (First in First Out) stack is used in 8086.In this type of Stack the first stored information is retrieved first.

What is occur in density flux state- ferromagnetic material, In a ferromagn...

In a ferromagnetic material the state of flux density is as follows when external magnetic field is applied to it. (A) Increased (B) Becomes zero (C) Remains unchang

Explain mesh - current method, Q. Explain Mesh - Current Method? This c...

Q. Explain Mesh - Current Method? This complements the nodal-voltage method of circuit analysis. A set of independent mesh-current variables that implicitly satisfy the KCL equ

Spectral analysis and signal bandwidth, Q. Show Spectral Analysis and Signa...

Q. Show Spectral Analysis and Signal Bandwidth? Spectral analysis is based on the fact that a sinusoidal waveform is completely characterized by three quantities: amplitude, ph

How does expert system works, How does Expert system works? System uses...

How does Expert system works? System uses a rule base and an inference engine together to simulate human reasoning whenever analysing a problem and arriving at a conclusion. To

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