PHY_10_50_V2_TG_Semicon.devices

RECOMMENDATIONS

on lesson “Semiconductor devices”

Theoretical material on topic: Semiconductor Devices

These devices are said to be neither good insulators nor good conductors, hence the name ‘Semi Conductors’. The semiconductor examples include the following:

·  op-amps

·  resistors

·  capacitors

·  diodes

·  transistors

These devices are widely used in many of the applications due to their reliability, compactness, low cost. As a discrete component, a semiconductor is used as optical sensors, power devices, light emitters, and also including the solid-state lasers. They also have a large range of current as well as voltage handling capacities, with the current ratings ranging from few nano-amperes i.e (10−9 ampere) up-to more than about 5,000 voltage and ampere ratings which extend above 100,000 volts.

Semiconductor devices supply themselves in integrating into complex and readily are manufacturable into microelectronic circuits. They also find a good scope in the future in forming key components for the majority of electrical and electronic instruments and systems in various fields such as communications, data-processing, consumer, and also in industrial-control equipments.

Diode

A diode is a semiconductor device that comprises of single p-n junction. P-n junctions are usually formed by joining up of p-type and n-type semiconductor materials. This formation is due to the reason that n-type region has the higher number of electron concentration whereas the p-type region has a higher number of hole concentration, hence the electrons get diffused from the n-type region to the p-type region. Hence this phenomenon is used in generating light.

Transistors

Transistors are of two types bipolar junction transistor and field effect transistor. The bipolar junction transistor is achieved by the formation of two p-n junctions in two different configurations like n-p-n or p-n-p. In this type of transistor, the three regions formed are named as emitter, collector, and base or the middle region.

The field effect transistor works on the principle of conductivity and the conductivity can be altered by the presence of an electric field.

Applications of Semiconductor Devices

·  They are used in the designing of logic gates and digital circuits.

·  These are used in microprocessors

·  They are used in analog circuits such as oscillators and amplifiers.

·  Used in high voltage applications.

In this lesson student do multiple choice questions. For teacher it might be useful answers to them:

ADDITIONAL MULTIPLE CHOICE QUESTIONS:

20. 

21. 

22. 

23. 

24. 

25. 

ANSWERS TO MCQ:

11. C

12. C

13. C     

14.B

15. A

16. A

17. C

18.D

19.D

20. A

21.D

22.C

23.C

24.D

25.A

Useful resources:

https://www.indiabix.com/electronic-devices/semiconductors/201006

https://lampx.tugraz.at/~hadley/psd/problems/exams/6mar15/index.html

https://www.electronics-notes.com/articles/electronic_components/resistors/light-dependent-resistor-ldr.php

https://byjus.com/physics/semiconductor-devices/

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