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Photoemission Study of the Electronic Structure of Cadmium Telluride (CdTe)
Johnson O. Akinlami, and Ayo M. Awobode

Here we report the electronic structure of Cadmium Telluride CdTe. The theoretical photoemission (PES) spectrum at ħω=21.2eV shows two distinct structures with peaks at about -9.7 eV as most prominent peak and at -16.5eV. Each of these peaks represent the peak of a distinct band, so, the theoretical photoemission (PES) spectrum shows two distinct bands. On the basis of the results of band structure calculation, these structures are interpreted to be associated with the density of states features. The peak at -16.5eV comes from symmetry point X6 at -9.2 eV, the peak at -9.7eV which is the most prominent peak arises from L4,5 at -0.6 eV. Peak at -9.7eV and at -16.5eV are separated by an energy gap or (energy level difference) of -6.9 eV.

Finally, the energy gap (or energy level difference) between two peaks for CdTe fell within the range -0.5 eV to -7.5 eV indicating that it could be used for the development of solid-state devices such as blue light emitting diodes, lasers, solar cells and micro-wave. PACS numbers: 78.90.+t, 71.22.+i.

Keywords: Photoemission spectroscopy, Electronic structure, Superconductor, Energy level difference.

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