Electronics 2

What is a conductor

Materials that conduct electricity

What is a insulator

Materials that do not conduct electricity

What is a semi conductor

Materials that conduct electricity under certain conditions.

What are the two methods of making semiconductors conduct

Heat and doping

What is doping

Adding impurities

What band do electrons normally sit in

The valance band

What band must electronic be in to conduct

The conduction band

What size energy gap do conductors have between the valance band and conduction band

No gap

What size energy gap do insulators have between the valance band and conduction band

A large energy gap

What size energy gap do semi conductors have between the valance band and conduction band

A small energy gap

What is a hole

A positive charge made by an electron jumping to the conduction band

What are the two types of impurities that can be added

N type and p type

How many electronics do N type have in their outer most shell

5

How many electronics do P type have in their outer most shell

3

What happens when a N - type impurity is add to silicon

4 covelent bonds are formed and 1 electron is left available to carry charge

What happens when a P - type impurity is add to silicon

3 covalent bonds are formed and 1 electron hole is created

What group in the peridoic table to N - type impurities come from

5th

What group in the periodic table to p - type impurities come from

3rd

What are the majority charge carriers for N - type semi conductors

Electronics

What are the majority charge carriers for P - type semi conductors

Holes

What are the minority charge carriers for N - type semi conductors

Holes

What are the minority charge carriers for P - type semi conductors

Electrons

What is an example of an N - type semi conductor

Arsenic

What is an example of an P - type semi conductor

Boron

When does a PN juction form

When P type and N type impuritees are joined togther

What happens at a PN juction

Charges align at the juction line and form a potential barrier

What is the potential barrier call at a PN juction

Depletion region

What is the potential difference of the depletion region

The amount of voltage required to move electrons through the electric field

What is the potential barrier for silicon

0.7

what is the potential barrier for germanium

0.3