Evidence for a common origin of the Urbach tails in amorphous and crystalline semiconductors
- 10 May 1982
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 15 (13), L419-L424
- https://doi.org/10.1088/0022-3719/15/13/008
Abstract
The absolute strengths of the exponential absorption tails of amorphous semiconductors can be correctly predicted from the band-to-band absorption spectra and the exponents of the tails only. This result shows that the tails are due to transitions between band-derived states, and that the mechanism giving rise to these states is common to all these materials. The same mechanism appears to operate in crystals, where it may be associated with band gap fluctuations.Keywords
This publication has 11 references indexed in Scilit:
- Urbach's rule derived from thermal fluctuations in the band-gap energyPhysical Review B, 1978
- Temperature and field dependence of the optical absorption edge in amorphous As2S3Journal of Physics C: Solid State Physics, 1974
- Urbach rulePhysica Status Solidi (a), 1971
- Urbach-Martienseen Rule and Exciton Trapped Momentarily by Lattice VibrationsJournal of the Physics Society Japan, 1971
- Conduction in non-crystalline systems V. Conductivity, optical absorption and photoconductivity in amorphous semiconductorsPhilosophical Magazine, 1970
- Structural, Optical, and Electrical Properties of Amorphous Silicon FilmsPhysical Review B, 1970
- Effect of Defect Fields on the Optical Absorption EdgePhysical Review B, 1963
- Electrical and Optical Properties of Vitreous SeleniumPhysical Review B, 1963
- Optical Properties of-Type Indium Arsenide in the Fundamental Absorption Edge RegionPhysical Review B, 1961
- The Long-Wavelength Edge of Photographic Sensitivity and of the Electronic Absorption of SolidsPhysical Review B, 1953