Optical spectra of CsI,CsBr, ZuGeP2, and SbSI |
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Authors: | Y Petroff S Kohn YR Shen |
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Institution: | Department of Physics, University of California, and Inorganic Materials Research Division, Lawrence Berkeley Laboratory, Berkeley, California 94720, USA |
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Abstract: | We report here the study of the normal reflectivity spectra R and the corresponding derivative spectra (1/R) dR/dE of SbSI between 2 and 6 eV. The spectra show very strong anisotropy. We have also tried to use the change of the wavelength modulation spectrum to monitor the change in the band structure of SbSI due to the phase transition at 292 °C (D2h16→C2v9). Careful examination of the spectra at various temperatures around Tc shows no observable change. We report also the wavelength-modulated reflectivity spectra of the chalcopyrite crystal ZnGeP2 at 5 K between 2 and 6 eV, for E∥ C and E⊥ C. The experimental results are compared with the theoretical band structure calculation by de Alvarez and Cohen. We also present measurements on CsBr, CsI in the vacuum uv (between 5 and 8 eV) at 1.8K, showing noticeable difference with previous reflectivity measurements at 77 K. |
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