It is conceivable that it is due to the neutral condition requirements, may be internal to the semiconductor minority carrier injection, for example, can the water in the n-type semiconductor injection hole, because the injection of positively charged hole, immediately will be surrounded by a large majority carrier - electronic (electronic can come from the surface or impurities, defects), still can maintain the whole semiconductor is electrically neutral,
For the heat balance of the state of the semiconductor, there is not a balanced carrier, also need to satisfy electrically neutral conditions, for example, when the concentration of injected nonequilibrium electronic Dn, it will appear at the same time not equilibrium hole concentration of Dp, and they are equal in number, or Dn=Dp,
Excuse me:
The first paragraph, after the injection hole, surrounded by electron hole, show neuter inside? Clearly more holes? Are electronic also more from outside?
The second paragraph, the balance hole come from? If the internal excitation, but at the same time more is not the same number of electrons?
Pleas bosses help to reassure,
CodePudding user response:
Transistor principle understanding of attention as a whole is electrically neutral, partial electric potential difference