Practice question · Sort into groups
Doping adds impurity atoms to silicon to supply mobile charge carriers. Sort each description.
Groups: n-type · p-type
- The majority carriers are negative
- The majority carriers are absences of electrons
- Holes act as mobile positive carriers
- Extra mobile electrons are supplied
Hints
- The letter names the sign of the carrier the doping supplies.
- A hole is a missing electron, which behaves like a positive charge.
Show the answer
n-type: Extra mobile electrons are supplied, The majority carriers are negative
p-type: Holes act as mobile positive carriers, The majority carriers are absences of electrons
Why
n-type supplies negative carriers, p-type supplies positive holes, and joining the two makes the p-n junction that conducts in only one direction. The names encode the carrier's sign, which is the fastest way to keep them straight.
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