Urbach tail in the absorption spectra of
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Hu, S. Y. ;Lee, Y. C. ;Shen, J. L. ;Chen, K. W. ;Huang, Y. S.
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Article
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2007
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John Wiley and Sons
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English
β 391 KB
## Abstract Urbach's rule and steepness parameter of 2HβWSe~2~ layered crystals have been studied via the absorption spectra from the photoconductivity (PC) measurements in the temperature range of 15β300 K. From the analysis of the temperatureβdependent band gap with Varshni semiβempirical equatio