Temperature Dependences of Optical Energy Gaps of SbSI@CNT and SbSeI@CNT

M. Jesioneka, M. Nowaka, M. Kępińskaa and I. Bednarczykb aSolid State Physics Section, Institute of Physics, Silesian University of Technology, Z. Krasińskiego 8, 40-019 Katowice, Poland bFaculty of Materials Science, Silesian University of Technology, Z. Krasińskiego 8, 40-019 Katowice, Poland

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This paper presents for the first time temperature dependences of optical energy gaps of SbSI@CNT and SbSeI@CNT, i.e. carbon nanotubes (CNTs) filled with antimony sulfoiodide (SbSI) and antimony selenoiodide (SbSeI). The heterostructures were prepared sonochemically using CNTs and elemental Sb, S or Se and I in the presence of solvent under ultrasonic irradiation. Spectral characteristics of diffusive transmittance and reflectance of SbSI@CNT and SbSeI@CNT were measured in temperature range 274 K < T < 333 K. The determinal temperature dependence of indirect forbidden optical energy gap of SbSI@CNT has been fitted with EgIf (T) = (1.92(2)-3.6(6) × 10-4 × T) eV. Indirect allowed optical energy gap of SbSeI@CNT has been fitted with EgIa (T) = (1.817(5)-7.1(2) × 10-4 × T) eV.

DOI: 10.12693/APhysPolA.124.836 PACS numbers: 78.67.Ch, 62.23.Hj, 78.67.Uh, 81.07.Gf