[19p-PA7-1~10] 16.1 Fundamental properties, evaluation, process and devices in disordered materials

[19p-PA7-7] Estimation of absorption edge at the short wavelength side in Ge-Sb-S glass and influence of CsCl and Oxygen on the absorption edge

〇Kohei Iwasaki¹, Shigeru Yamamoto¹, Arifumi Okada¹, Takashi Wakasugi¹, Kohei Kadono¹ (1.Kyoto Inst. of Tech.)

Keywords:chalcogenide glass, Tauc plot, absorption edge

Since sulfide glass, which is one of the chalcogenide glass systems, has excellent infrared transmission in the near- and mid-infrared regions, it is expected to be applied for infrared optical systems such as surveillance cameras and remote sensing spectrometers. On the other hand, it is difficult to determine the absorption edge at the short wavelength side because glass has an amorphous structure. Therefore, quantitative and standard methods to determine the absorption edge have not been shown.
In this study, we examined estimation of absorption edge. The direct transition and indirect transition wear calculated according Tauc equation. And the absorption edge was evaluated from the thickness dependence of Tauc gap.