Semiconductor and devices
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This document discusses semiconductor devices and provides information on diodes and transistors. It describes that semiconductors are materials that can perform electronic functions and lists examples like diodes and integrated circuits. Diodes are two terminal semiconductor devices made of a p-n junction that allow current flow in only one direction. Transistors are three terminal devices made of two back-to-back p-n junctions and come in NPN and PNP types. The document provides diagrams and explanations of forward and reverse bias in diodes and the basic structure and symbols for NPN and PNP transistors. It concludes with advantages of transistors and a question about combining diodes to form a transistor.
Semiconductor and devices
- 1. Semiconductor Devices By Md.Rabius Sani Biplob Sarker Fahmida Hossain Bappy Das
- 2. 5.12.2014 Semiconductor Devices 2 ●Introduction ●Types of Semiconductor Devices ●Diode ●Forward & Reverse Bias ●Transistor ●Types of transistors ●Queries
- 3. 5.12.2014 Semiconductor Devices 3 Introduction ●Semiconductor: ●Unit which consists lagely or wholly,of semiconductor materials which can perform useful function in electronic apparatus & solid state research. ●Ex:p-n jun diode,transistros,IC's and etc.
- 4. 5.12.2014 Semiconductor Devices 4 Types of Semiconductors ●There are two types of Semiconductors ● 1)Intrisic Semiconductors ● 2)Extrinsic Semiconductors ●Intrinsic Semiconductors:Tetravalent ● Ex:Si,Ge etc ●Extrinsic Semiconductors: Ex:p-type and n-type
- 5. 5.12.2014 Semiconductor Devices 5 DIODE ●Diode is device with two electrodes. ●A p-n juncion diode is a two terminal device made up of semiconductor crystal. ●P-N junction diode + - P-n junction diode ckt symbol
- 6. 5.12.2014 Semiconductor Devices 6 Forward Bias ●Resistance is very small + - mA Depletion Layer B p n P-n junction-Forward Bias
- 7. 5.12.2014 Semiconductor Devices 7 Reverse Bias ●Resistance is very high ●Conduction is due to thermal agitation. Depletion Layer B +- p n MA P-n junction-Reverse Bias
- 8. 5.12.2014 Semiconductor Devices 8 Transistors ●Invented in 1948 ●A transistor is a semiconductor device used to amplify and switch electronic signal. ●Consist of two p-n junctions back to back ●Has three regions: ●1)Emitter ●2)Base ●3)Collector
- 9. 5.12.2014 Semiconductor Devices 9 ●Base is made up of P- type ●Current conduction is mainly due to holes P-N-P Transistor ppp pn Ckt symbol of p-n-p transistor E B C p-n-p transistor
- 10. 5.12.2014 Semiconductor Devices 10 N-P-N Transistor ●Base is made up of p- type. ●Current conduction is mainly due to electrons. E C B n np Ckt symbol of n-p-n transistor n-p-n transistor
- 11. 5.12.2014 Semiconductor Devices 11 Advantages ●Used in microcircuits. ●They're quite strong&sturdy. ●Usually,they've long life. ●Swithches turn on&off with the use of transistor.
- 12. 5.12.2014 Semiconductor Devices 12 ANY QURIES? ●Can two diodes combined back to back as shown in ●fig to form a transistor? P N N P
- 13. 5.12.2014 Semiconductor Devices 13 THANK YOU