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IIT JEE > Learn IIT JEE Coaching > Distinguish between ‘intrinsic’ and ‘extrinsic’ semicon...
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Distinguish between ‘intrinsic’ and ‘extrinsic’ semiconductors.

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An intrinsic semiconductor material is chemically very pure and possesses poor conductivity. It has equal numbers of negative carriers (electrons) and positive carriers whereas an extrinsic semiconductor is an improved intrinsic semiconductor with a small amount of impurities added by a process, known...
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An intrinsic semiconductor material is chemically very pure and possesses poor conductivity. It has equal numbers of negative carriers (electrons) and positive carriers whereas an extrinsic semiconductor is an improved intrinsic semiconductor with a small amount of impurities added by a process, known as doping, which alters the electrical properties of the semiconductor and improves its conductivity. read less
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Teaching professional with 12 of experience in teaching

Intrinsic semiconductor: An intrinsic semiconductor material is chemically very pure and possesses poor conductivity. It has equal numbers of negative carriers (electrons) and positive carriers (holes). A silicon crystal is different from an insulator because at any temperature above absolute zero temperature,...
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Intrinsic semiconductor: An intrinsic semiconductor material is chemically very pure and possesses poor conductivity. It has equal numbers of negative carriers (electrons) and positive carriers (holes). A silicon crystal is different from an insulator because at any temperature above absolute zero temperature, there is a finite probability that an electron in the lattice will be knocked loose from its position, leaving behind an electron deficiency called a "hole".If a voltage is applied, then both the electron and the hole can contribute to a small current flow. Extrinsic Semiconductor An extrinsic semiconductor is an improved intrinsic semiconductor with a small amount of impurities added by a process, known as doping, which alters the electrical properties of the semiconductor and improves its conductivity. Introducing impurities into the semiconductor materials (doping process) can control their conductivity. Doping process produces two groups of semiconductors: the negative charge conductor (n-type) and the positive charge conductor (p-type). Semiconductors are available as either elements or compounds. Silicon and Germanium are the most common elemental semiconductors. Compound Semiconductors include InSb, InAs, GaP, GaSb, GaAs, SiC, GaN. Si and Ge both have a crystalline structure called the diamond lattice read less
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M.Sc. Biomedical Genetics, B.Sc. Biotechnology

Intrinsic Semiconductors 1. Intrinsic semiconductors, also called an undoped semiconductors or i-type semiconductor, are pure semiconductor without any significant dopant species present. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount...
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Intrinsic Semiconductors 1. Intrinsic semiconductors, also called an undoped semiconductors or i-type semiconductor, are pure semiconductor without any significant dopant species present. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount of impurities. 2. Conductivity of intrinsic semiconductors is poor . 3. Number of electrons in conduction band and holes in valence band are approximately equal . 4. Fermi energy level lies at the centre of forbidden energy gap. Extrinsic Semiconductors 1. These are impure semiconductors . When a small quantity of impurity is mixed in a pure or intrinsic conductor , conductivity of semiconductor increases . Such an impure semiconductor is called extrinsic semiconductor. 2. Conductivity of extrinsic semiconductors is large. 3. If it is an n-type electrons are in majority and if it is a p-type holes are in majority . 4. In n-type Fermi-level lies near the bottom of conduction band and in p-type near the top of valence base . read less
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Math Educator for Std.11th ,12th , Engineering Entrance and Degree Level with 11+ Years Experience

Intrinsic Semiconductor : 1.)These are pure semiconductor without any significant dopant species present. it is also called i-type semicondoctor. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount of impurities. 2.) Conductivity of intrinsic...
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Intrinsic Semiconductor : 1.)These are pure semiconductor without any significant dopant species present. it is also called i-type semicondoctor. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount of impurities. 2.) Conductivity of intrinsic semiconductors is poor . 3.) Number of electrons in conduction band and holes in valence band are approximately equal . 4.) Fermi energy level lies at the centre of forbidden energy gap. Extrinsic Semiconductors : 1.) These are impure semiconductors . When a small quantity of impurity is mixed in a pure or intrinsic conductor , conductivity of semiconductor increases . Such an impure semiconductor is called extrinsic semiconductor. 2.) Conductivity of extrinsic semiconductors is large. 3.) If it is an n-type semiconductor , electrons are majority carrier and holes are minority carrier and if it is a p-type semiconductor ,holes are majority carrier and electrons are minority carrier. 4.) In n-type semiconductor,Fermi-level lies near the bottom of conductioin band and in p-type semiconductor, fermi - level lies near the top of valence band . read less
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B.Tech(EC/EE/IN),Math(IX,X,XI,XII std.),Physics(IX,X,XI,XII std.) CBSE/ICSE/IB.

These are impure semiconductors . When a small quantity of impurity is mixed in a pure or intrinsic conductor , conductivity of semiconductor increases . Such an impure semiconductor is called extrinsic semiconductor
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Related Questions

I was enrolled to a coaching for 11th and 12th standard. Due to my low performance in JEE advanced I want to give 1 more year to prep. I have all the study material. I am planning to just solve that and join test series. But the problem is how to get my doubts cleared? And will this strategy work?
you can look out for online tutors who can clear your doubts. Also there are many online forums available that can help you with the same. Look out for tricks that are available on Youtube. you can also opt for online test series.
Priyanshu
Is it possible to get full marks in maths on class 12 CBSE without tution or coaching?
Yes, ofcourse ... If you practice enough by yourself. Tution means its like u are under a mentor or guide who is helping you out what is to be practice or types of book you need to follow when you are in confusion mode..
Samit
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they only way to improve in mathematics is practice. as you are very poor in mathematics so i will suggest you to give more time and more attention to the mathematics subject. you have to practice more so that you can remember the mathematics. to score good marks in mathematics i will suggest some way of practicing mathematics. first of all find out some chapters which are more easier to you than the others. first solve all that easy chapters. after knowing the method how to solve one particular mathematics solve so many mathematics yourself related to that, if there is any formula for the mathematics then write all the formulas of the chapter in a paper and keep the paper always in front of you. you may write all the formulas for the total syllabus in a page and may keep it in front of you. when you will be confident enough that you covered all the easy chapters then go for the other chapters. try to know the easy method to solve any mathematical problem. always try to solve mathematics yourself without taking any help. but if you fail just take help from book or any teacher and after that again solve the problem yourself. don't fear about mathematics. fear will decrease your confident. always take mathematics as easy subject. just do lots of practice. surely you will get good marks in mathematics in board examination if you study hard and give attention to the mathematics subject Source: http://entrance-exam.net/forum/general-discussion/how-score-good-marks-maths-board-exam.
this is very useful. thanks sir
Manibhushan Kumar
How do I manage time to study in class 12 with coaching and school?
All you need is proper planning .
Ashwini
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What if I change my coaching institute for my class 12 JEE preparation (I'm now in 11th)?
It depends upon the coaching centre and your comfort of getting the subject
Latha
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