JEE (Based on NTA Guidelines-IIT Engg.) Mains Physics Electronic Devices-Junction Transistor Study Material (Page 1 of 3)

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Techniques for Making P-N Junction

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  • Alloy Method:
    • Here a small piece of three group impurity like indium is placed over n-Ge or n-Si and melted as shown in figure ultimately P-N junction form.
    • This impurity is p-type impurity into the surface of n-type crystal.
    • Heating the material until liquefaction, where two materials are meet. After cooling the materials give P-N junction at the boundary of the alloy substance.
    • Alloy diodes have high current rating.
  • Diffusion Junction:
Image Shows the Diffusion Junction
  • A heated p-type semico…

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Junction Transistors

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Junction Transistors

  • A junction transistor is a semiconductor electronic device, discovered by Willium Shockly in 1951. It is made in two forms:
    • p-n-p Transistor
    • n-p-n Transistor

P-N-P Transistor

It is a single crystal containing two p-n junctions such that there is very thin central layer of n-type semi-conductor enclosed on either side by p-type semiconductor. The central layer has a thickness of about cm and is called the base.

P-N-P Transistor
Symbol of PNP

Symbol of PNP

  • The p-type semiconductors on left and right side o…

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