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[求助] 半导体载流子的寿命

On illumination of a trap-free p-type semiconductor, the promotion
of photoelectrons to the conduction band is followed by rapid
thermalization to the band-edge, resulting in an excess free-carrier
density that is sustained over the band-to-band lifetime of the
charge carriers.
  这段文字请大神帮忙翻译一下,大概是说半导体载流子寿命的,具体的看不太懂。
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