Question 1 of 20
What defines an intrinsic semiconductor?
An intrinsic semiconductor is a pure semiconductor material, like silicon or germanium, with no impurities.
Question 2 of 20
What is the primary source of electrical conductivity in an intrinsic semiconductor?
Electrical conductivity in an intrinsic semiconductor arises from breaking covalent bonds due to thermal energy.
Question 3 of 20
What happens when a covalent bond breaks in an intrinsic semiconductor?
When a covalent bond breaks, a free electron and a corresponding hole are generated.
Question 4 of 20
What is an extrinsic semiconductor?
An extrinsic semiconductor is created by adding impurities (dopants) to a pure semiconductor.
Question 5 of 20
What is the process of adding impurities to a semiconductor called?
The process of adding impurities is called doping.
Question 6 of 20
What type of semiconductor is formed when holes are the majority carriers?
A p-type semiconductor has holes as the majority carriers.
Question 7 of 20
What type of semiconductor is formed when electrons are the majority carriers?
An n-type semiconductor has electrons as the majority carriers.
Question 8 of 20
Which dopant would typically create a p-type semiconductor in silicon?
Boron, with three valence electrons, creates a 'hole' in the silicon lattice, making it p-type.
Question 9 of 20
Which dopant would typically create an n-type semiconductor in silicon?
Phosphorus, with five valence electrons, provides an extra electron, making it n-type.
Question 10 of 20
In an intrinsic semiconductor, the concentration of electrons is always equal to the concentration of:
In an intrinsic semiconductor, electron and hole concentrations are equal.
Question 11 of 20
What is the primary function of doping in a semiconductor?
Doping increases the electrical conductivity of a semiconductor.
Question 12 of 20
At low temperatures, what is the state of covalent bonds in an intrinsic semiconductor?
At low temperatures, all covalent bonds are complete, meaning no free carriers are available.
Question 13 of 20
What is a 'hole' in a semiconductor?
A 'hole' represents the absence of an electron in the crystal lattice.
Question 14 of 20
What type of charge does a hole effectively have?
A hole behaves as if it has a positive charge.
Question 15 of 20
What happens when an electron 'fills' a hole?
When an electron fills a hole, the hole is eliminated, as the absence of an electron is now filled.
Question 16 of 20
Which of the following is NOT a property of an intrinsic semiconductor?
Intrinsic semiconductors have relatively low conductivity.
Question 17 of 20
Which element, when added to silicon, would most likely create an n-type semiconductor?
Phosphorus has five valence electrons and will donate an electron to the silicon lattice, making it n-type.
Question 18 of 20
What is the effect of temperature increase on an intrinsic semiconductor's conductivity?
As temperature increases, more covalent bonds break, increasing the number of free electrons and holes, thus increasing conductivity.
Question 19 of 20
What is the primary difference between intrinsic and extrinsic semiconductors concerning their conductivity?
Extrinsic semiconductors are much more conductive than intrinsic semiconductors due to the presence of dopants.
Question 20 of 20
Which of the following materials is most commonly used as a base for semiconductors?
Silicon is the most commonly used semiconductor material.
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