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i read sth about how to achieve effective mass in infinte potential well problem, i don't get the second part of your word! tunneling efect which describe the reverse current in p-n junction!
@teteamijo: you mean: because high effective mass of electron in conduction band rather than carriers in valence band, electrons move faster than holes, and there is another question, why is effective mass of carriers in conduction band higher than carriers in valence band?
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