Bulk cubic CdS is known to have band gap of 2.42 eV. But hexagonal CdS band gap is not so easy case to find. Does anyone have reference data for bulk hexagonal CdS bandgap?
Do a google search for hexagonal CdS bandgap and you will find numerous refernces including this one:
Photocatalytic Hydrogen Production with Visible Light over Pt-Interlinked Hybrid Composites of Cubic-Phase and Hexagonal-Phase CdS
Silva, L.A.; Ryu, S.Y.; Choi, J.; Choi, W.; Hoffmann, M. R. Journal of Physical Chemistry C 2008, 112, 12069
Abstract
A hybrid photocatalytic system, which is based on a mixed-phase cadmium sulfide matrix composed of nano-particulate cubic-phase CdS (c-CdS) with average particle diameters of 13 nm and a bandgap energy of 2.6 eV, is coupled with bulk-phase hexagonal CdS (hex-CdS) that has a bandgap energy of 2.3 eV and is interlinked with elemental platinum deposits......
Hi guys,
you can find some refs here.
Nano Lett., 2014, 14 (2), pp 486–494
good luck!
Dear colleague,
for hexagonal CdS, in analogy to most other semiconductor materials and insulators, there does not exist a simple, unambiguous answer to your question, because the band gap is rather strongly depending on lattice temperature. It is known from series of experimental papers (published in particular between 1960 and 1995) that Eg(T) is monotonically decreasing with increasing T. A list of these papers, including a physically reasonable analytical descriptiption of this Eg(T) dependence for h-CdS you can find in my first paper on this problem: R. Passler, Phys. Stat. Sol. (B) 193, p. 135 to 144 (1996) (see in particular formula (6), with empirical parameters Eg(0), alfa, Thetaeff, and p(=2.47) given in the upper part of Table 1). In various later papers, I have still developed some other (partly more elaborate) analytical formulas for Eg(T) dependences, with applications to many other materials. In these papers, I have quoted also the corresponding parameter values for h-CdS: see e. g.
Table 1 in Phys. Stat. Sol. (B) 216, 975 (1999),
Table 1 in J. Appl. Phys. 89, 6235 (2001),
Table 1 in Phys. Rev. B 66, 085201 (2002), and
Table 1 in Phys. Stat. Sol. (B) 236, 710 (2003).
If some of these papers are not available to you, please let me know. I can send you reprints (or pdf-files) of these papers.
With best regards
Roland Passler
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