| 单词 | impurity level |
| 释义 | > as lemmasimpurity level impurity level n. an energy level in a semiconductor that is due to an impurity atom and generally lies either just above the highest filled (valence) energy band (in the case of an acceptor) or just below the lowest empty (conduction) band (in the case of a donor). ΘΚΠ the world > matter > physics > solid state physics > semiconductivity > [noun] > energy band or gap energy gap1933 impurity level1933 conduction band1939 valence band1956 1933 R. H. Fowler in Proc. Royal Soc. A. 140 507 Semi-conductors with impurity levels full of electrons at low temperatures owe their conductivity to the excitation of electrons to band 1 both from the impurity levels and from band 2, the former predominating at ordinary temperatures. 1964 J. M. Ziman Princ. Theory Solids vi. 169 In a semiconductor there may also be scattering from a neutral impurity—where, for example, an electron has settled in a donor impurity level, or a hole is resident on an acceptor level. < as lemmas |
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