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Energy band structure and Frenkel excitons in PbGa2S4 |
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| Authors: | IG StamovNN Syrbu VV UrsakiVI Parvan VV Zalamai |
| Institution: | a Tiraspol State Corporative University, Lablocikin Street 5, 2069 Tiraspol, Republic of Moldova b Technical University of Moldova, 168 Stefan cel Mare Avenue, 2004 Chisinau, Republic of Moldova c Institute of Applied Physics, Academy of Sciences of Moldova, 5 Academy Street, 2028 Chisinau, Republic of Moldova |
| Abstract: | Optical reflection spectra are measured and calculated in PbGa2S4 crystals in the region of resonances related to excitons with large oscillator strength and binding energy (Frenkel excitons). The splitting of the upper valence band in the center of the Brillouin zone due to crystal field (Δcf) and spin orbit (Δso) interaction are determined. Optical reflection spectra are measured and calculated according to Kramers-Kronig relations in the region of 3-6 eV in Е⊥с and Е∥с polarizations, and the optical constants n, k, ε1 and ε2 are determined. The observed electronic transitions in PbGa2S4 crystals are discussed in the frame of theoretical energy band structure calculation for thiogallate crystals. |
| Keywords: | Semiconductor compound Optical absorption reflection and luminescence spectra Excitons Optical constants Band structure |
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