Abstract
Electronic density of states in the extended and localized states govern optical and electrical properties. We see, in this chapter, that studies on electronic properties have yielded a lot of valuable ideas, such as Tauc gap, mobility edge, and charged defects. In addition, concepts originally proposed for crystals such as polaron and Urbach edge bear special importance in chalcogenide glasses. We also consider optical nonlinearity, which is prominent in the chalcogenide glass. Electrical conduction mechanisms, under dc and ac electric fields, are also discussed. It is suggested that the Meyer–Neldel law is important to obtain full understanding of the transport mechanisms. The final section refers to composition dependence of the bandgap energy.
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Notes
- 1.
Theoretically, we may multiply the right-hand side by 1/ω, while the factor gives least effects. Absorption with n = 2 appears also in indirect transitions in crystals, which suggests that static and vibrational disorders play similar (neglecting and suppressing wavenumber conservation) roles in the electronic excitation.
- 2.
2A slightly different expression was given later. See Saitoh and Tanaka (2011).
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Tanaka, K., Shimakawa, K. (2011). Electronic Properties. In: Amorphous Chalcogenide Semiconductors and Related Materials. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-9510-0_4
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