Bulg. J. Phys. vol.27 no.S3 (2000), pp. 021-024



Threshold Energy in Direct Transition

M. Istrate
Technical University, Department of Physics B-dul D. Mangeron, Corp T, 6600 Iasi, Romania
Abstract. The photon absorbtion in a semiconductor lead to: the electron transition from the valence band to the conduction band (the fundamental absorbtion), the electron transition within the same band, the formation of excitons, the electron transitions from the donor impurity levels to the conduction band or from the valence band to the acceptor impurity levels etc...

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