18 Questions
What is the relationship between electron density (n) and hole density (p) in an intrinsic semiconductor?
n = p = ni
Where is the Fermi level (EFi) located in an intrinsic semiconductor?
Near the middle of the forbidden band
What happens to the Fermi level (EFi) if kT is significantly lower than the energy gap?
Remains near the middle of the forbidden band
What type of semiconductor has a lower electron density but a higher hole density compared to an intrinsic semiconductor?
P-type semiconductor
What are impurities called that lack one or several electrons to realize a full bonding with the rest of the crystal in a semiconductor?
Acceptors
What type of impurity is intentionally added to a P-type semiconductor like silicon?
Acceptor
What is an intrinsic semiconductor?
A semiconductor with evenly distributed electrons and holes
What role does doping play in semiconductor behavior?
Introduces impurities to modify carrier concentrations
What is the role of the energy density of states N(E) in semiconductors?
Represents the number of states per unit volume and energy range
For a direct gap semiconductor, what is the effective mass of an electron in the crystal?
The effective mass of an electron
What does Nc(E) represent in semiconductors?
Number of states in the conduction band per unit volume and energy
Intrinsic semiconductors differ from doped semiconductors mainly by:
Having vacancies created by thermally excited electrons
What is the most well-known material in semiconductor research?
Silicon
Which type of semiconductor consists of two different elements?
Extrinsic semiconductor
What type of device was germanium frequently used in before silicon took over?
Rectifiers
Which material was not suitable for applications requiring weak current consumption and high temperature operation?
Germanium
What type of semiconductors have electrical or optical properties that are not achievable with pure semiconductors?
Extrinsic semiconductors
When did silicon start to overcome all other semiconductors?
1960
Learn about intrinsic semiconductors, which are undoped semiconductors, and how electron-hole densities in the conduction and valence bands play a crucial role in their behavior.
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