Optical Properties of Bismuth Tri-Iodide Single Crystals. : II. Intrinsic Absorption Edge
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概要
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The optical absorption spectra near the fundamental edge have been measured on high quality single crystals of BiI_3. Above 50K, the absorption coefficient near the edge is well described by the Urbach's rule. At lower temperatures, the corresponding transitions are of the allowed indirect type involving the creation of free excitons, and absorption components associated with three phonon energies have been resolved. The energies of the phonons are found to be 2.6±0.1, 7.1±0.2 and 13.4±0.4meV. The absorption cross-section of the indirect transition is very large compared with that observed in indirect semiconductors and ionic crystals. These results are discussed in view of band nature of BiI_3. Preliminary results on sharp absorption lines near the edge are also given.
- 社団法人日本物理学会の論文
- 1976-05-15
著者
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KOMATSU Teruo
Department of Physics, Osaka City University
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Komatsu Teruo
Department Of Physics Faculty Of Science Osaka City University
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KAIFU Yozo
Department of Physics, Faculty of Science, Osaka University
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Kaifu Yozo
Department Of Applied Physics Osaka City University
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