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Solid State Devices

Quiz 1 Review

What is a semiconductor? a material whose electrical conductivity can be controlled over a wide range from near-insulating to metal-like conducting.
What property makes semiconductors special for electronic device applications? engineerable conductivity
The following are semiconductors... Silicon(Si),Germanium(Ge),Diamond,Gallium Nitride(GaN)
Energy bandgap is? the span of energies that lie between the valence and conduction bands for insulators and semiconductors.
A unit cell is the smallest part of a crystal that has no periodicity in itself.
The lattice constant is one of the dimensions of a unit cell.
Where can you find GaAs? Cell phone, TV remote, TV satellite dish
Why is crystalline semiconductor more desirable than polycrystalline and amorphous? because electron speed is much faster in crystalline.
Where do most of today's semiconductors come from? they are made by industries.
Why do people try so hard to grow semiconductors rather than take it from nature? because they want a very pure crystal.
How many crystals do people want to get, when they grow a big boule? just a single crystal.
Epitaxial growth means: the growth of a semiconductor on the surface of a semiconductor.
Why do impurities matter? Impurities affect the transport properties of a semiconductor. It can make semiconductors highly conducting (shallow donors or acceptors) or highly insulating (deep traps).
True or False: Impurities will always make a semiconductor useless. False.
Doping means... to put certain atoms in a semiconductor or the insertion of controlled impurities.
A doped semiconductor: has a different electrical conductivity than before doped.
An unintentionally doped semiconductor is: a semiconductor that gets doped accidentally during the growth.
True or False: A zero-impurity polycrystalline semiconductor is always more valuable than a single-crystal semiconductor with impurities. False. Controllable impurities are desirable because this is how we make devices.
Can you just buy raw semiconductors (not in a circuit)? Yes.
What were the motivations for people to develop semiconductors? To have materials whose electrical conductivity can be controlled.
Before the development of semiconductor devices, people: did computation with mechanical devices(e.g. abacus, mechanical gears, etc.) and metal and glass-bulb electrical devices.
The development of semiconductor devices improved what? Radio, telephone, wireless communication.
Created by: ravalencia