Semiconductors-Basic Transistor Electronics-Lecture Slides, Slides of Basic Electronics

Jagmeet Chatterji delivered this lecture at Aliah University for Basic Electronics course. Its main points are: Conductors, Semiconductors, Insulators, Resistance, Intrinsic, Extrinsic, Pure, Impurity, Covalent, Bonds

Typology: Slides

2011/2012

Uploaded on 07/13/2012

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Basic Electronic Engineering
Lecture 1
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Basic Electronic Engineering

Lecture 1

Types of Materials

  • Conductors
    • Materials that offer low resistance to electric current
  • Semi conductors
    • Materials that have a value of resistance between that of a conductor and an insulator
  • Insulators
    • Material that offers high resistance to the flow of current

Covalent Bonds

Types of Semiconductors

  • Semiconductors do not conduct well in intrinsic form
  • Semiconductors are modified by adding impurity atoms to increase conductivity
  • Two types of extrinsic semiconductors exists
    • n-type Semiconductors
    • p-type Semiconductors

n-type semiconductors

p-type semiconductors

  • Trivalent impurity atoms are added to intrinsic silicon or germanium
  • Impurities include Boron, Indium and Gallium
  • Holes are the majority carriers in p-type semiconductor materials
  • Electrons are minority carriers

Majority and Minority Carriers

p-n junction Diode

  • Diode is formed by joining p-type and n-type materials together
  • A diode is a unidirectional device
  • There is no net charge on the device as the number of electrons are equal to the number of protons

Diode

  • Depletion Region
    • Charges move across the junction to combine leaving behind a region void of charges

Diode

  • Barrier potential
    • Positive and negative charge around the junction forms an electric field
    • This electric field acts as a barrier for further electrons from n-region to move to p-region
    • Barrier potential of silicon is 0.7 V and barrier potential of germanium is 0.3 V at room temperature