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Quiz: Topic 2 Question responses should be in short answer form or 1-2 sentences maximum. Write on back of paper if needed. 1. What is the difference between a crystalline solid and an amorphous solid?
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Quiz: Topic 2
Question responses should be in short answer form or 1-2 sentences maximum. Write on back of paper
if needed.
1. What is the difference between a crystalline solid and an amorphous solid?
Crystalline solids have an orderly geometric arrangement of their constituent particles and also have
sharp melting . Amorphous solids contain no geometry shapes; they have a range of temperature
over which they melt.
2. What are grain boundaries and how do they relate to crystals?
A grain boundary can be defined as the interface between two crystallites in a polycrystalline
material. They are formed when two disoriented crystals relative to each other are brought into
intimate contact.
3. What is the difference between a metal and an insulator?
A metal allows electric current to flow freely through it whereas an insulator does not allow electric
current to flow through it.
4. What is Band-gap energy and how does it relate to the properties of semiconductors?
Band gap energy is an energy range needed by a valence electron to move to the conduction band. A
key property of semiconductor is that it Band gap energy varies with applied potential energy hence it
can act as conductor or insulator depending on the conditions.
4. Draw a simple silicon-carbide lattice.
6. What is a radical? And which two elements have most reactive radicals?
A radical is a molecule or atom that contains an unpaired electron hence unstable and highly reactive.
Hydroxyl and carbine molecules are among the most reactive radicals.
7. What is the advantage and disadvantage of E-beam lithography compared to Photolithography?
The main advantage of using E-beam lithography is that it is not limited by diffraction since it is not an
optical process whereas photolithography is limited by diffraction. The disadvantage of E-beam
lithography over Photolithography is that it can only operate in vacuum and not operate in ambient
pressures while photolithography can operate in ambient pressures and vacuum.
8. What is a common method for depositing thin metal films? E beam deposition It takes place under
high vacuum.
9. Name two methods of an etching a wafer. Which would I use if I n...
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