semi conductor Flashcards
conduction band
where electrons are delocalised and can move as part of a current
valence band
electrons fixed in place as part of a bond
bond gap
energy required to move electrons from valence to conduction band
semi conductor exapmle
thermistor
ldr
silicon
semi conductors band gap is
small
conductors dont have a
band gap
semi conductor conduction band
low n value
increasing a n value
less resistance so better conductor
postive hole
space left by the electron that jumped the band gap into the conduction band
electrons enter conduction band once they have gained enough energy, leaving behind a
positive ion
electrons move towards
pos terminal
another electron will fill the pos hole, leaving behind
another pos hole
there’s an overall movement of pos holes towards
the neg terminal
pos hole are another
charge carrier - contributing to the current in a semiconductor
