Semiconductor Electronics — Chapter Summary
ICSE · Class 12 · Physics
Summary of Semiconductor Electronics for ICSE Class 12 Physics. Part of the ICSE Class 12 Physics syllabus. Semiconductor electronics studies.
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Overview
Semiconductor electronics studies the electrical behaviour of materials with conductivity between conductors and insulators, and how this behaviour is explained using energy bands, holes, intrinsic semiconductors, and doped semiconductors. Conductors have a large number of free electrons, insulators
Key Concepts
Conductors allow charge to flow easily
Conductors allow charge to flow easily because they have many free electrons. Insulators have practically no free electrons and a large forbidden gap,
When many atoms come together
When many atoms come together in a solid, their discrete atomic energy levels split into a large number of closely spaced levels called an energy band
The valence band is the highest
The valence band is the highest occupied band containing valence electrons. The conduction band is the next permitted band above it. Current conductio
The forbidden gap is the range
The forbidden gap is the range of energies between the valence band and the conduction band where no electron states are allowed. In diamond the gap i
The highest energy level in
The highest energy level in the valence band at absolute zero is called the Fermi level. In an intrinsic semiconductor, it lies at the centre of the f
Learning Objectives
- Classify materials as conductors, insulators, or semiconductors using energy band structure
- Understand the meaning of valence band, conduction band, forbidden gap, and Fermi level
- Explain why semiconductors conduct poorly at low temperature and better at higher temperature
- Describe intrinsic semiconductors and the origin of electron-hole pairs
- Understand doping and the formation of n-type and p-type semiconductors
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