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Unformatted text preview: = 0.05 V 2 m = 2.5 x 10-2 V/m 201 18.28 (a) No hole is generated by an electron excitation involving a donor impurity atom because the excitation comes from a level within the band gap, and thus, no missing electron is created from the normally filled valence band. (b) No free electron is generated by an electron excitation involving an acceptor impurity atom because the electron is excited from the valence band into the impurity level within the band gap; no free electron is introduced into the conduction band. 202...
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- Spring '11
- Semiconductors, Condensed matter physics, valence band, Electronic band structure, acceptor impurity atom