10 Questions
What is the function of a Group 3 impurity in a semiconductor?
It acts as an acceptor atom, creating an excess of holes
What happens when a P-N junction is formed using different semiconductor materials without doping?
The movement of electrons is inhibited by the grain boundary
What gives rise to a diffusion current across a P-N junction?
Diffusion of electrons from the n-side to the p-side
What is formed as a result of an electron diffusing from the n-side to the p-side in a P-N junction?
Layer of positive charge on the n-side
What causes an electric field to develop in a P-N junction?
Development of a layer of negative charge on the p-side
What is the pure form of a semiconductor known as?
Intrinsic semiconductor
How is the n-type semiconductor produced?
By adding Phosphorus (P) to the intrinsic semiconductor
What are the ionized phosphorus atoms added to the silicon called?
Donor atoms
What type of impurities are intentionally added to produce an extrinsic semiconductor?
Impurities from the fifth group of the periodic table
What is the P-type semiconductor produced by adding to the intrinsic semiconductor?
Aluminum (Al)
Study Notes
Semiconductor Basics
- A Group 3 impurity in a semiconductor acts as an acceptor, leading to a lack of electrons (holes) and a P-type semiconductor.
P-N Junction Formation
- When different semiconductor materials are used without doping, a P-N junction is not formed.
- A P-N junction can only be formed by combining a P-type and an N-type semiconductor.
Current Across a P-N Junction
- Diffusion current across a P-N junction occurs due to the concentration gradient of electrons and holes.
Electron Diffusion in a P-N Junction
- When an electron diffuses from the n-side to the p-side in a P-N junction, it combines with a hole, resulting in a depletion region.
Electric Field in a P-N Junction
- An electric field develops in a P-N junction due to the separation of charge carriers, creating a depletion region.
Intrinsic Semiconductors
- The pure form of a semiconductor is known as an intrinsic semiconductor.
Extrinsic Semiconductors
- An N-type semiconductor is produced by adding a Group 5 impurity, such as phosphorus, to an intrinsic semiconductor.
- Ionized phosphorus atoms added to silicon are called donors.
- Intentionally added impurities, such as boron or phosphorus, produce an extrinsic semiconductor.
- A P-type semiconductor is produced by adding a Group 3 impurity, such as boron, to an intrinsic semiconductor.
Learn about the concepts of intrinsic and extrinsic semiconductors in this quiz. Understand the differences between the pure form and impurity-added form of semiconductors.
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