Semiconductor Physics
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PHYSICS
Condensed Matter Physics
Semiconductor Physics
Semiconductors' tunable conductivity powers the digital age's core technology
6 Feb 2026
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What key process allows semiconductors to have adjustable electrical conductivity?
Changing the temperature of the semiconductor material
Doping by adding impurities to the crystal structure
Applying a magnetic field to the semiconductor
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PHYSICS
Semiconductor Physics
Depletion Region
Depletion region forms an insulating barrier critical to semiconductor device function
1 Feb 2026
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What is the primary reason the depletion region acts as an insulating barrier in a semiconductor device?
Because mobile charge carriers are depleted, leaving only fixed ionized impurities that do not conduct current
Because the depletion region contains an excess of free electrons that block current flow
Because the depletion region is made of a different material that is inherently non-conductive
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PHYSICS
Semiconductor Physics
Charge Carrier Separation in Solar Cells
How charge carrier separation drives the conversion of sunlight into electricity in solar cells
28 Jan 2026
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What role does the p-n junction play in charge carrier separation within a solar cell?
It absorbs photons and directly converts them into electric current without creating charge carriers.
It stores the charge carriers until they can be released as electric current later.
It creates an internal electric field that drives electrons and holes in opposite directions, preventing recombination.
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PHYSICS
Condensed Matter Physics
Semiconductor Physics
Semiconductors bridge the gap between conductors and insulators enabling modern electronics
28 Jan 2026
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What is the primary effect of doping in a semiconductor material?
It changes the crystal structure to make the material a perfect insulator.
It introduces impurities that create free charge carriers, modifying conductivity.
It converts the semiconductor into a superconductor at room temperature.
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PHYSICS
Semiconductor Physics
Tunnel Diode
Germanium tunnel diodes harness quantum tunneling to achieve ultra-fast electronic switching
24 Jan 2026
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What characteristic of the germanium tunnel diode allows it to exhibit negative resistance?
Thermal excitation of electrons over a wide bandgap
Quantum mechanical tunneling of electrons through a thin depletion region
Classical conduction through a thick p-n junction
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