# Why Base Is Kept Very Thin In Transistor

Solution : The base region in a transistor is made very thin so that there is a better conduction of majority carriers from emitter to collector through base.

The base of a transistor is kept very thin compared to the collector and emitter so that most of the carriers(carriers means electron in case of NPN transistor …

As per above, we saw base is lightly doped. The width of the region depends upon their doping. The base region is lightly doped so that width of the base is …

## Why is the base of a transistor kept thin and lightly biased?

If base is made thick and highly doped, majority carriers will combine with the other carriers within the base and only few is collected by the collector which leads to small output collector current. Thus in order to have large output collector current, base is made thin and lightly doped.

## Is the base of transistor made very thin?

In a transistor the base is made very thin and is lightly doped with an impurity, so as to enable the collector to collect about 95% of the holes or electrons coming from the emitter side. Was this answer helpful?

## What is the function of base region of a transistor Why is this region made thin and lightly doped?

The base is kept thin and slightly doped so that, when emitter of transistor is forward biased, the less number of electron-hole combination takes place in base region and majorityof charge carriers going from emitter towards base, pass over to collector.

## Why is the base layer thin and lightly doped?

The base region in a transistor is doped lightly so that the number density of majority carriers (electrons in p-n and holes in n-p-n transistor) is low. When emitter is forward biased, the majority carriers move from emitter to collector through base.

## Why base is kept very thin?

The base of a transistor is kept very thin compared to the collector and emitter so that most of the carriers(carriers means electron in case of NPN transistor and holes in case of PNP transistor) pass to the collector, injected from the emitter i.e, less number of electron-hole recombination take place and the whole …

## Why is the base of transistor made thin and lightly doped Shaalaa?

The base of a transistor is lightly doped than the emitter and narrowed so that almost all electrons injected from the emitter (in a npn transistor) diffuse right across the base to the collector junction without recombining with holes. In other words, the base width is kept smaller than the recombination distance.

## Why emitter is heavily doped and base is lightly doped?

The emitter is heavily doped, as more number of electrons pass through it, base is lightly doped as it only carries least current and the collector is moderately doped.

## Which transistor is very thin and lightly doped?

PNP transistor: It is formed by sandwiching a thin layer of N-type semiconductor between two P-type semiconductors.

## Why is the base region of a transistor very thin?

In a transistor, the base is made extremely thin to reduce the combinations of holes and electrons. Under this condition, most of the holes (or electrons) arriving from the emitter diffuses across the base and reach the collector.

## Which transistor region is very thin and lightly doped Mcq?

Base is very thin and lightly doped.

## Why is the base region of a transistor thin and lightly doped?

If base is made thick and highly doped, majority carriers will combine with the other carriers within the base and only few is collected by the collector which leads to small output collector current. Thus in order to have large output collector current, base is made thin and lightly doped.

## Which is lightly doped in BJT transistor?

The region which is lightly doped in BJT is: Base. Collector. Emitter.

## More Answers On Why Base Is Kept Very Thin In Transistor

### Why is the Base very thin in a transistor? – Byju’s

The base of a transistor is kept very thin compared to the collector and emitter so that most of the carriers (carriers means electrons in case of npn transistors and holes in case of pnp transistors) pass to the collector injected from the emitter.

### Why is a transistor base thin? – Quora

Because when the bipolar transistor is in the active region, the electrons come “accelerated” from the emitter and are collected by the collector; the thinner the base, the larger is the percentage of electrons which are collected. In fact there is a parameter which represents this fraction, which is (forward) α F, so we have I C = α F I E

### Why the base of transistor is thin and lightly doped

Hope you understand clearly why the base is lightly doped in bjt or in the transistor. For good amplification process, we required less base current and more collector current So we try to reduce base current by less doping of base region. Thus, the base region is thin and lightly doped region.

### Reason for a thin base of transistor – Physics Stack Exchange

The base of bipolar transistors is kept thin mainly to improve their speed of operation, which is related to the transit time t T of the electrons from the emitter to the collector which decreases with decreasing thickness of the base. In modern transistors, recombination in the base is practically negligible. The so-called transit frequency

### Why is the base of transistor made very thin? – Answers

Since the base in an n-p-n transistor is kept very thin, very few electrons get to recombine with holes and escape out of base, most of the electrons are injected from emitter into the collector….

### In a transistor why is the base made thin in comparison to the emitter …

the base of a transistor is kept very thin compared to the collector and emitter so that most of the carriers (carriers means electron in case of npn transistor and holes in case of pnp transistor) pass to the collector, injected from the emitter i.e, less number of electron-hole recombination take place and the whole current emitted from the …

### In a transistor why is the base made thin in comparison to the emitter …

the base of a transistor is kept very thin compared to the collector and emitter so that most of the carriers(carriers means electron in case of npn transistor and holes in case of pnp transistor) pass to the collector, injected from the emitter i.e, less number of electron-hole recombination take place and the whole current emitted from the …

### in a transistor, why is base is made thin? – Brainly.in

Oct 30, 2020The base region in a transistor is made very thin so that there is a better conduction of majority carriers from emitter to collector through base. … The base region in a transistor is doped lightly so that the number density of majority carriers (electrons in p-n and holes in n-p-n transistor) is low Advertisement Advertisement

### Answer in brief. Why is the base of a transistor made thin and is …

The base of a transistor is lightly doped than the emitter and narrowed so that almost all electrons injected from the emitter (in a npn transistor) diffuse right across the base to the collector junction without recombining with holes. In other words, the base width is kept smaller than the recombination distance.

### Why the width of base region in a Transistor ( BJT ) is kept thin and …

Why the width of base region in a Transistor ( BJT ) is kept thin and li… Posted 4 weeks ago by Grasp with Dr. Aditi. 0 Add a comment Grasp With Dr Aditi The channel Grasp With Dr Aditi is started by Dr. Aditi Srivastava (GATE Qualified) with educational qualifications B.Tech, M. Tech, Ph.D in the field of Electronics & Communication Engineering from National Institute of Technology …

### Why is it that in a transistor, the base is thin lightly doped and the …

Why is the base region of a transistor thin and lightly doped? The base region is meant for “only the control” of the strong flow of charge carriers from the Emitter towards the Collector. It is not supposed to absorb/emit any carriers on its own ideally.

### Why is the base current in a transistor very small? – Quora

The base collected junction a transistor is reverse biased. This causes the depletion region of the base collector junction to be wider and penetrate deeper into the base.

### Why is the base of a transistor made thin and is lightly doped?

Oct 5, 2021Best answer The base of a transistor is lightly doped than the emitter and is made narrow so that virtually all the electrons injected from the emitter (in an npn tran-sistor) diffuse right across the base to the collector junction without recombining with holes. That is, the base width is kept less than the recombination distance.

### What’s the purpose of shorting the base and collector of a transistor …

Shorting collector to base is NOT redundant, it serves the useful purpose of making conduction in the two transistors similar. In particular, the construction of a transistor includes a thin base region between emitter and collector, and that base region has an effective electrical resistance. Forcing all current in one transistor through the …

### Solved b) Explain why the width of the base region of a – Chegg

Engineering. Electrical Engineering. Electrical Engineering questions and answers. b) Explain why the width of the base region of a transistor is kept very small compared to other regions. (3 marks)

### Base Region of a Bipolar Junction Transistor (BJT)

When the base current receives sufficient current, a larger current then flows from the emitter to the collector. In a bipolar junction transistor, current flows from the emitter to the collector and then out from the collector. The base region of a BJT transistor is very thin and is lightly doped with current carriers.

### Bipolar Junction Transistors Questions & Answers – Inst Tools

9. Why the width of the base region of a transistor is kept very small compared to other regions? Base region of a transistor is kept very small and very lightly doped so as to pass most of the injected charge carriers to the collector. 10. Why emitter is always forward biased?

### the base region of a transistor is made very thin as compared with …

The base region in a transistor is made very thin so that there is a better conduction of majority carriers from emitter to collector through base. Due to it , the base current is quite weak, the collector current is nealy equal to the emitter current.

### What is Transistor? Definition, Symbol, Terminals … – Circuit Globe

The base of the transistor is very thin and lightly doped because of which it has less number of electrons as compared to the emitter. The few electrons of the emitter are combined with the hole of the base region and the remaining electrons are moved towards the collector region and constitute the collector current.

### What is transistor? Definition, symbol, construction & terminals of …

Transistor has mainly three regions: emitter, base, and collector. Furthermore here base region is much thinner than the other two regions. The emitter region is heavily doped so that there is large numbers of charge carrier contain b emitter region. A base region is a thin layer and receives a charge carrier from the emitter region.

### Transistor Basics | DigiKey

Since the 2N3904 is an NPN transistor, the base needs positive biasing (appropriate voltage levels and resistance) to turn on the collector emitter junction for proper current flow. Use of a load resistor (R1) is also important so there is not too much current being driven through the LED and transistor. For more information on this transistor, see the 2N3904 datasheet. Figure 5: 2N3904 …

### Bipolar Junction Transistors (BJTs) Questions and Answers

Q9. Why the width of the base region of a transistor is kept very small compared to other regions? Base region of a transistor is kept very small and very lightly doped so as to pass most of the injected charge carriers to the collector. Q10. Why emitter is always forward biased? Emitter is always forward biased w.r.t base so as to supply …

### in a transistor ,why is the base lightly doped – Science – – 2639014 …

Base provides the proper junction for interconnection between emitter and collector. It is made thin and slightly doped so, the number of majority carriers is low. So less number of electron-hole recombination take place and whole current emitted from the emitter with a slight difference is passed to the collector.

### in a transistor, why is base is made thin? – Brainly.in

The base region in a transistor is made very thin so that there is a better conduction of majority carriers from emitter to collector through base. … The base region in a transistor is doped lightly so that the number density of majority carriers (electrons in p-n and holes in n-p-n transistor) is low. Advertisement Advertisement New questions in Physics. 2. Given: vi = 3 m/s, v2 = 4 m/s, V3 …

### Why the width of base region in a Transistor ( BJT ) is kept thin and …

Why the width of base region in a Transistor ( BJT ) is kept thin and li… Posted 4 weeks ago by Grasp with Dr. Aditi. 0 Add a comment Grasp With Dr Aditi The channel Grasp With Dr Aditi is started by Dr. Aditi Srivastava (GATE Qualified) with educational qualifications B.Tech, M. Tech, Ph.D in the field of Electronics & Communication Engineering from National Institute of Technology …

### the base region of a transistor is made very thin as compared with …

The base region in a transistor is made very thin so that there is a better conduction of majority carriers from emitter to collector through base. Due to it , the base current is quite weak, the collector current is nealy equal to the emitter current.

### Why the width of base region in a Transistor ( BJT ) is kept thin and …

Why the width of base region in a Transistor ( BJT ) is kept thin and li… Posted 9th May by Grasp with Dr. Aditi. 0 Add a comment Grasp With Dr Aditi The channel Grasp With Dr Aditi is started by Dr. Aditi Srivastava (GATE Qualified) with educational qualifications B.Tech, M. Tech, Ph.D in the field of Electronics & Communication Engineering from National Institute of Technology, Allahabad …

### Explain the function of base region of a transistor. Why is … – Zigya

The base provides proper interaction between the emitter and collector. The flow of majority charge carriers from emitter to the collector is controlled by the base of a transistor. Electron hole recombination takes place in the base region when emitter is forward biased. If the base is thin and lightly doped, it will have a small number density of majority charge carriers.

### Solved b) Explain why the width of the base region of a – Chegg

Engineering. Electrical Engineering. Electrical Engineering questions and answers. b) Explain why the width of the base region of a transistor is kept very small compared to other regions. (3 marks)

##### Resource

https://www.quora.com/Why-is-a-transistor-base-thin?share=1
https://pnpntransistor.com/transistor-base-thin-lightly-doped/
https://physics.stackexchange.com/questions/389040/reason-for-a-thin-base-of-transistor
https://brainly.in/question/27207278
https://www.quora.com/Why-is-it-that-in-a-transistor-the-base-is-thin-lightly-doped-and-the-collector-is-large-in-size?share=1
https://www.quora.com/Why-is-the-base-current-in-a-transistor-very-small?share=1
https://physics.stackexchange.com/questions/371360/whats-the-purpose-of-shorting-the-base-and-collector-of-a-transistor-in-current