7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Coupling coefficients and excitonic transitions in CuGaSe<sub>2</sub>

9 Jul 2014, 17:10
1h 50m
D Ring ground level

D Ring ground level

Board: A.384
Poster Presentation Track A - Division for Physics of Condensed Matter and Materials Poster2

Speaker

Dr Augusto Machatine (University of Pretoria)

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

No

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

The chalcopyrite structure contains semiconductor compounds and alloys that crystalize in a space group D2d12. These compounds are used in the fabrication of solar cells.
The excitonic radiative transitions in chalcopyrite CuGaSe2/ are investigated using group theoretical methods in the absence and presence of spin-orbit interaction. We have calculated the coupling coefficients for optical direct transitions at high symmetry points Γ, X, N and P in the Brillouin zone of chalcopyrite structure. The inclusion of spin-orbit interactions results in modification of selection rules for radiative processes. The obtained dielectric functions,tensors, absorption coefficients and refractive index are determined by the exciton symmetry &Gamma6x&Gamma6, &Gamma6x&Gamma7 and &Gamma7x&Gamma7 Kronecker products. The critical point analysis throughout the Brillouin zone at point &Gamma, X, N, and P are discussed in the absence and presence of spin-orbit interaction in the study of reflectivity peaks. The theoretical results are used in the interpretation of reflectivity and photoluminescence spectra in chalcopyrite group and coupling coefficients also useful in the construction of effective Hamiltonains from which estimates of optical transition energies can be made.

Main supervisor (name and email)<br>and his / her institution

Augusto Machatine , augusto.machatine@up.ac.za, University of Pretoria

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

PhD

Primary author

Dr Augusto Machatine (University of Pretoria)

Co-author

Dr Mmantsae Diale (University of Pretoria)

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