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Questions and Answers
What is the expression for electrical conductivity in a semiconductor?
What is the expression for electrical conductivity in a semiconductor?
- sigma = n*e*mue + p*e*muh
- sigma = n+e*mue + p+e*muh
- sigma = n*e/mue + p*e/muh
- sigma = n/e*mue + p/e*muh (correct)
How does the conductivity of pure silicon change with increasing temperature?
How does the conductivity of pure silicon change with increasing temperature?
- it decreases
- it stays the same
- it increases (correct)
- it becomes infinite
How does the conductivity of intrinsic semiconductors change with increasing temperature?
How does the conductivity of intrinsic semiconductors change with increasing temperature?
- it stays the same
- it increases (correct)
- it becomes infinite
- it decreases
What is the relationship between the number of conduction electrons in an intrinsic semiconductor and the energy bandgap?
What is the relationship between the number of conduction electrons in an intrinsic semiconductor and the energy bandgap?
What is the energy bandgap of CdS in eV?
What is the energy bandgap of CdS in eV?
For an intrinsic semiconductor, what is the relationship between the number of electrons and the number of holes?
For an intrinsic semiconductor, what is the relationship between the number of electrons and the number of holes?
In an n-type semiconductor, what are the majority carriers?
In an n-type semiconductor, what are the majority carriers?
What is the relationship between the difference in electronegativity between the constituting elements and the energy bandgap in compound semiconductors?
What is the relationship between the difference in electronegativity between the constituting elements and the energy bandgap in compound semiconductors?
What type of bonds are formed between the impurity and the nearest Si atom when a group-V impurity is added to Si?
What type of bonds are formed between the impurity and the nearest Si atom when a group-V impurity is added to Si?
When a group-V impurity is added to Si, how many valence electrons from the impurity form bonds with the nearest Si atom?
When a group-V impurity is added to Si, how many valence electrons from the impurity form bonds with the nearest Si atom?
In an intrinsic semiconductor, what is the typical state of the valence and conduction bands?
In an intrinsic semiconductor, what is the typical state of the valence and conduction bands?
What is the correct statement about phosphorus substitutional atoms in a silicon at room temperature?
What is the correct statement about phosphorus substitutional atoms in a silicon at room temperature?
What is the primary cause of free electron creation in an intrinsic conductor?
What is the primary cause of free electron creation in an intrinsic conductor?
In an intrinsic semiconductor, what is the result of thermal excitation?
In an intrinsic semiconductor, what is the result of thermal excitation?
What is the correct statement about donor exhaustion in a n-type semiconductor?
What is the correct statement about donor exhaustion in a n-type semiconductor?
What type of dopant is Boron in Si and Ge semiconductors?
What type of dopant is Boron in Si and Ge semiconductors?
What is the primary mechanism of electrical conduction in intrinsic semiconductors?
What is the primary mechanism of electrical conduction in intrinsic semiconductors?
What type of excitation is primarily responsible for conductivity in intrinsic semiconductors?
What type of excitation is primarily responsible for conductivity in intrinsic semiconductors?
What are the majority carriers in a p-type semiconductor?
What are the majority carriers in a p-type semiconductor?
What happens to the conductivity of doped silicon with increasing doping concentration?
What happens to the conductivity of doped silicon with increasing doping concentration?
In an n-type doped silicon, what do the n-type atoms donate to give the silicon a conduction band?
In an n-type doped silicon, what do the n-type atoms donate to give the silicon a conduction band?
What is the extrinsic doping level for phosphorus in silicon?
What is the extrinsic doping level for phosphorus in silicon?
At what temperature is the thermal energy too low to excite donor electrons, resulting in a freeze-out?
At what temperature is the thermal energy too low to excite donor electrons, resulting in a freeze-out?
What is the temperature range for which conduction is extrinsic in an extrinsic semiconductor?
What is the temperature range for which conduction is extrinsic in an extrinsic semiconductor?
What is the nature of conduction in an extrinsic semiconductor at very high temperatures?
What is the nature of conduction in an extrinsic semiconductor at very high temperatures?
How can the structure of glassy silicate ceramics be modified?
How can the structure of glassy silicate ceramics be modified?
What is the effect of flaws on the properties of ceramics?
What is the effect of flaws on the properties of ceramics?
What is the primary purpose of refractories in ceramics?
What is the primary purpose of refractories in ceramics?
What is the main application of ceramic glasses?
What is the main application of ceramic glasses?
What is the classification of ceramic materials that includes glasses, clays, and refractories?
What is the classification of ceramic materials that includes glasses, clays, and refractories?
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