Semiconductor Electronics: Materials, Devices and Simple Circuits
Uttarakhand Board · Class 12 · Physics
Complete topic list for Semiconductor Electronics: Materials, Devices and Simple Circuits in Uttarakhand Board Class 12 Physics. Key concepts, sub-topics, and what to focus on for board exams.
Topics in Semiconductor Electronics: Materials, Devices and Simple Circuits
Classification of Materials
- Materials are classified into metals, semiconductors, and insulators based on electrical conductivity
- Metals have very low resistivity (10⁻² to 10⁻⁸ Ω m) and high conductivity (10² to 10⁸ S m⁻¹)
- Semiconductors have intermediate resistivity (10⁻⁵ to 10⁶ Ω m) and conductivity (10⁻⁶ to 10⁵ S m⁻¹)
Intrinsic Semiconductors
- Pure semiconductors like Si and Ge with no impurities are intrinsic semiconductors
- Silicon and germanium have diamond lattice structure with 4 valence electrons each
- Covalent bonding occurs between neighboring atoms sharing electron pairs
Extrinsic Semiconductors
- Doping pure semiconductors with impurities creates extrinsic semiconductors
- Dopant atoms must have similar size to host atoms to avoid lattice distortion
- Two types: n-type (pentavalent dopants) and p-type (trivalent dopants)
p-n Junction Formation
- p-n junction forms when p-type and n-type regions are created in same semiconductor
- Two processes occur: diffusion (due to concentration gradient) and drift (due to electric field)
- Electrons diffuse from n-side to p-side, holes diffuse from p-side to n-side
Key Concepts
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