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Neither a good insulator, now conductor.
Contains 4 electrons in valence shell.
When bonded with other substances creates impurities.
Most common semiconductor
Germanium
Silicon
Most common impurities
Antimony
Arsenic
Doping
The process of adding impurities to a semiconductor to create new characteristic.
Semiconductor
4 electrons.
Impurity
5 electrons.
New Substance
9 electrons.
Diode Solid state device composed of semiconductors.
Most common type of semiconductor
Device that is designed to permit electron flow in one direction, and block flow from the other direction
Think of a diode as an electrical check valve.
Two sides
Negative N type material
Positive P type material
Anode positive
cathode negative
PN junction in the middle
To ensure no short, a depletion region is included
Think of it as a neutral zone
In the middle
Cross hair with an arrow pointing to the middle Anode at the back Cathode at the front
Flows from negative to positive.
The cathode of a diode is physically identified with a dot or band or a schematic symbol will be present
Can act as a open or closed switch
This state can be refereed to as
Forward biased
Reversed biased
A forward biased diode is connected to a power source positive to positive and negative to negative
A forward biased diode will allow current flow
A reversed biased diode is connected to a power source positive to negative and negative to positive a reversed biased diode will not allow current flow
Used in rectifiers to convert ac to dc
Used to control direction of current
Safety device
Used to indicate voltage and status
LED
Photo sensor diode
Used for sensor application.
Light emitting diode
LED
Arrows going out emitting
Arrows going in receiving
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