Semiconductor Devices

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Semiconductor Devices

  1. 1. Semiconductor Devices <ul>By Rajesh Kumar </ul>
  2. 2. <ul><li>Introduction
  3. 3. Types of Semiconductor Devices
  4. 4. Diode
  5. 5. Forward & Reverse Bias
  6. 6. Transistor
  7. 7. Types of transistors
  8. 8. Queries </li></ul>Agenda
  9. 9. Introduction <ul><li>Semiconductor:
  10. 10. Unit which consists lagely or wholly,of semiconductor materials which can perform useful function in electronic apparatus & solid state research.
  11. 11. Ex:p-n jun diode,transistros,IC's and etc. </li></ul>
  12. 12. Types of Semiconductors <ul><li>There are two types of Semiconductors
  13. 13. 1)Intrisic Semiconductors
  14. 14. 2)Extrinsic Semiconductors
  15. 15. Intrinsic Semiconductors:Tetravalent
  16. 16. Ex:Si,Ge etc
  17. 17. Extrinsic Semiconductors: </li><ul><li>Ex:p-type and n-type </li></ul></ul>
  18. 18. DIODE <ul><li>Diode is device with two electrodes.
  19. 19. A p-n juncion diode is a two terminal device made up of semiconductor crystal.
  20. 20. P-N junction diode </li></ul>+ - P-n junction diode ckt symbol
  21. 21. Forward Bias <ul><li>Resistance is very small </li></ul>+ - mA Depletion Layer B p n P-n junction-Forward Bias
  22. 22. Reverse Bias <ul><li>Resistance is very high
  23. 23. Conduction is due to thermal agitation. </li></ul>Depletion Layer B + - p n MA P-n junction-Reverse Bias
  24. 24. Transistors <ul><li>Invented in 1948
  25. 25. A transistor is a semiconductor device used to amplify and switch electronic signal.
  26. 26. Consist of two p-n junctions back to back
  27. 27. Has three regions:
  28. 28. 1)Emitter
  29. 29. 2)Base
  30. 30. 3)Collector </li></ul>
  31. 31. <ul><li>Base is made up of P-type
  32. 32. Current conduction is mainly due to holes </li></ul><ul>P-N-P Transistor </ul>p p p p n Ckt symbol of p-n-p transistor E B C p-n-p transistor
  33. 33. N-P-N Transistor <ul><li>Base is made up of p-type.
  34. 34. Current conduction is mainly due to electrons. </li></ul>E C B n n p Ckt symbol of n-p-n transistor n-p-n transistor
  35. 35. Advantages <ul><li>Used in microcircuits.
  36. 36. They're quite strong&sturdy.
  37. 37. Usually,they've long life.
  38. 38. Swithches turn on&off with the use of transistor. </li></ul>
  39. 39. ANY QURIES? <ul><li>Can two diodes combined back to back as shown in
  40. 40. fig to form a transistor? </li></ul>P N N P
  41. 41. THANK YOU

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