This slide was made for my university presentation in "Electronic Devices and Circuits" course.

1. SEMICONDUCTOR

2. Course: CSE225 (Electronic Devices and Circuits)
Course Teacher: Md. Sayedul Arefin(MSA)
Section: P Depertment: CSE(43 Batch)
Group Members:
01. Md. Ashaf Uddaula (161-15-7473)
02. Alamin Hossain (161-15-7483)
03. Md. Khasrur Rahman (161-15-7214)
04. Md. Abdullah Al Mamun(161-15-7476)
05. Ijaz Ahmed Utsa (161-15-7180)
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3. GOING TO TELL ABOUT…………….
• What is semiconductor?
• Invention history of semiconductor
• Properties of Semiconductors
• Energy bands in semiconductors
• Effect of Temperature on Semiconductors
• Hole current
• Majority and Minority Carriers
• Types of Semiconductors
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4. WHAT IS SEMICONDUCTOR?
• A semiconductor material is one whose electrical properties lie
in between those of insulators and good conductors. Examples
are: germanium and silicon.
• In mathematically, A semiconductor is a substance which has
resistivity 10-4 to 0.5 Ω-m in between conductors and insulators
e.g. germanium, silicon, selenium, carbon etc.
• In terms of energy bands, semiconductors can be defined as
those materials which have almost an empty conduction band
and almost filled valence band with a very narrow energy gap (of
the order of 1 eV) separating the two.
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5. INVENTION HISTORY OF SEMICONDUCTOR
• The beginning of semiconductor
research is marked by Michael
Faraday’s 1833 report on negative
temperature coefficient of resistance
of silver sulfide. This is the first
observation of any semiconductor
property.
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6. PROPERTIES OF SEMICONDUCTORS
Variable
conductivity
Heterojunctions
Excited
electrons
Light emission
Thermal energy
conversion
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7. ENERGY BANDS IN SEMICONDUCTORS
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8. EFFECT OF TEMPERATURE ON SEMICONDUCTORS
At absolute zero
Above absolute zero
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9. HOLE CURRENT
In physics, a hole is an
electric charge carrier with a
positive charge, equal in
magnitude but opposite in
polarity to the charge on the
electron. Holes and electrons
are the two types of charge
carriers responsible for
current in semiconductor
materials.
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10. MAJORITY AND MINORITY CARRIERS
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11. TYPES OF SEMICONDUCTORS
Semiconductors
Extrinsic
Semiconductors
N-type P-type
Intrinsic
Semiconductors
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12. THE END
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