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Semiconductors

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by

Melissa Becker

on 4 January 2013

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Transcript of Semiconductors

A substance with electrical intermediate conductivity between that of an insulator (which does not allow am electrical current) and a conductor (does allow the flow of electrical currents). Semiconductors Categories Semiconductors are classified into two categories. Intrinsic and Extrinsic. Doping doping- A semiconductors behavior can be manipulated by the addition of impurities. This means you can inject a semiconductor with another element and it will alter the semiconductor's properties. Properties Silicon and Germanium-(most common)C
Crystalline structure
Four valance electrons
Used in circuitry
Moderately okay at conducting
Form perfect covalent bonds with four neighboring atoms, creating a lattice Why Germanium and Silicon have the same type of structure and semiconducting properties Questions 1. What is a semiconductor?
2. What are the two categories semiconductors
are classified in?
3. Explain the process of doping Compound Semiconductors Intrinsic- a material that is chemically very pure and possesses poor conductivity. It has an equal number of negative carriers (electrons) and positive carriers (holes). Intrinsic Extrinsic- an improved intrinsic semiconductor with a small amount of impurities added by a process, known as doping Extrinsic A semiconductor can be doped to such high levels that it acts more like a conductor then a semiconductor which is known as degenerate. Germanium and silicon are located in the same group on the periodic table. Which means they share the same electrical properties.

They can both also be doped with Arsenic and Gallium which means their properties must be similar. Answers 1. A material that has a conductivity between a conductor and an insulator.


2. Intrinsic and Extrinsic


3. Injecting a semiconductor with another element to alter its properties. A compound semiconductor is a semiconductor composed of elements from two or more different groups of the periodic table. These semiconductors typically form in groups 13-15. The advantage of compound semiconductors is that they provide the device engineer with a wide range of energy gaps and mobilities, so that materials are available with properties that meet specific requirements. Some of these semiconductors are therefore called wide band gap semiconductors lattice All elements used to make semiconductors appear in column IV or are a combination of elements in columns at equal distance of column IV on each side. Column IV includes Carbon, Silicon, Germanium, and Tin.
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