Ch 14 - SEMICONDUCTOR ELECTRONICS: MATERIALS, DEVICES AND SIMPLE CIRCUITS12th Physics
Vacuum Tubes vs. Solid-State Devices
What is the fundamental physical difference in how charge carriers are generated and flow in classical vacuum tubes compared to modern solid-state semiconductor devices?
What is the fundamental physical difference in how charge carriers are generated and flow in classical vacuum tubes compared to modern solid-state semiconductor devices?
Vacuum Tubes (Valves): Electrons are supplied by a heated cathode and must flow unidirectionally through an evacuated space (vacuum) to reach the anode. They require high operational voltages (), consume high power, and are physically bulky.
Solid-State Semiconductors: The supply and flow of charge carriers (electrons and holes) occur entirely within the solid lattice itself. They require no external heating or vacuum, operate at very low voltages, consume minimal power, and offer high reliability.
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Classification by Resistivity & Conductivity
What are the standard order-of-magnitude ranges for resistivity () that physically distinguish Metals, Semiconductors, and Insulators?
What are the standard order-of-magnitude ranges for resistivity () that physically distinguish Metals, Semiconductors, and Insulators?
Metals: Possess very low resistivity.
Semiconductors: Possess intermediate resistivity.
Insulators: Possess extremely high resistivity.
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Valence Band vs. Conduction Band
In the energy band theory of solids, how are the Valence Band and the Conduction Band formally defined at absolute zero ()?
In the energy band theory of solids, how are the Valence Band and the Conduction Band formally defined at absolute zero ()?
Valence Band: The highest energy band that contains the bonded valence electrons. At absolute zero (), this band is completely filled with electrons.
Conduction Band: The energy band located directly above the valence band. At absolute zero (), this band is completely empty in semiconductors and insulators. Electrons must jump here to become free mobile charge carriers.
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Also in this chapter
44 more cards to study in Prism
- 4Energy Band Gap ($E_g$) Classification
- 5Intrinsic Semiconductors
- 6The Concept of a Hole
- 7Total Current in a Semiconductor
- 8Doping and Extrinsic Semiconductors
- 9n-Type Semiconductors
- 10p-Type Semiconductors
- 11Charge Neutrality of Doped Semiconductors
- 12Donor and Acceptor Energy Levels
- 13Formation of p-n Junction: Diffusion vs. Drift
- 14Mass Action Law (Equilibrium Concentration)
- 15The Depletion Region
- 16Barrier Potential ($V_0$)
- 17Digital Signals and Logic Gates
- 18Universal Logic Gates
- 19Monolithic Integrated Circuits (ICs)
- 20p-n Junction under Forward Bias
- 21Minority Carrier Injection
- 22p-n Junction under Reverse Bias
- 23Reverse Saturation Current & Breakdown
- 24Output Ripple Frequency of Rectifiers
- 25Dynamic Resistance of a Diode
- 26Capacitor Input Filter
- 27Zener Diode Principle
- 28Zener Diode as a Voltage Regulator
- 29Working of a Photodiode
- 30Light Emitting Diode (LED)
- 31Physics of a Solar Cell
- 32Emitter, Base, and Collector
- 33Transistor Current Equation
- 34Dynamic Resistances in CE Configuration
- 35CE Current Amplification Factor ($\beta$)
- 36Voltage Gain of a CE Amplifier
- 37Transistor Oscillator Frequency
- 38Temperature Dependence of Intrinsic Concentration
- 39The Carbon Insulator Anomaly
- 40p-n Junction Diode Current Equation
- 41Threshold / Cut-in Voltage
- 42I-V Characteristics of a Solar Cell
- 43Temperature Coefficient of Resistance (TCR)
- 44Material Selection for Solar Cells
- 45CB and CE Current Amplification Factors
- 46Visible LED Material Specifications
- 47Zener Voltage Regulator Currents
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