Absorption edge and optical constants of Tl2Ga2S3Se crystals from reflection and transmission, and ellipsometric measurements

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Isik M., Gasanly N.

PHYSICA B-CONDENSED MATTER, vol.407, no.12, pp.2229-2233, 2012 (SCI-Expanded)

• Publication Type: Article / Article
• Volume: 407 Issue: 12
• Publication Date: 2012
• Doi Number: 10.1016/j.physb.2012.03.004
• Journal Name: PHYSICA B-CONDENSED MATTER
• Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
• Page Numbers: pp.2229-2233
• Middle East Technical University Affiliated: Yes

Abstract

The optical properties of Tl2Ga2S3Se layered crystalline semiconductors were investigated from transmission, reflection and ellipsometric measurements. The experimental results of the room temperature transmission and reflection measurements performed in the wavelength range of 400-1100 nm showed the presence of both indirect and direct transitions in the band structure of the crystals with 2.38 and 2.62 eV band gap energies.