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conduction
electrons move through the ________ band
small
semiconductors have a ____ band gap
doping
how do we artificially move the gap for a material
adding or removing electrons from bands by introducing foreign atoms into the crystal lattice of a semiconductor.
what is doping?
n-type
introducing electron-rich atoms is called _____ doping
p-type
introducing electron-poor atoms is called _____ doping
raise, negative electrons
n-type semiconductors essentially (raise or lower) the valence band. The main charger carriers are ______ ______
lower, positive holes
p-type semiconductors essentially (raise or lower) the valence band. The main charger carriers are ______ ______
directionality
if you have a p-type and n-type next to each other you can induce __________ in electron flow
downhill, uphill
electrons flow _______ relative to potentiala energy, hole flow ________ relative to potential energy
excited, external
by choosing appropriate materials, bands can be aligned in such a way that an ______ electron can hop from one material to the next until it reaches an _______ circuit