Influence of ZnSe:Te substrate's surface morphology on their optical properties

V. P. Makhniy; I. I. Herman; G. I. Bodul; I. M. Senko

doi:10.15222/TKEA2016.6.36

V. P. Makhniy Yurii Fedkovych Chernivtsi National University, Chernivtsy, Ukraine
I. I. Herman Yurii Fedkovych Chernivtsi National University, Chernivtsy, Ukraine
G. I. Bodul Yurii Fedkovych Chernivtsi National University, Chernivtsy, Ukraine
I. M. Senko Yurii Fedkovych Chernivtsi National University, Chernivtsy, Ukraine

DOI: https://doi.org/10.15222/TKEA2016.6.36

Keywords: zinc selenide, mirror and matte surfaces, quantum-dimensional effect, luminescence, transmission

Abstract

The authors have experimentally established, that etching of ZnSe:Te substrates in CrO₃:HCl=2:1 and H₂SO₄:H₂O₂=3:1 solutions leads to formation of mirror and matte surfaces. Analysis of the topogram obtained by an atomic power microscope showed that the matte surface is a set of equally oriented pyramids with basis size 2–5 μm and each of them is an association of nanopyramids with 10-100 nm lateral size. In such samples, the wide photoluminescence band at 2.7–3.8 eV is a result of dimensional quantization in smaller nanocrystals. The latter also causes an observed decrease of transmission coefficient of substrates with matte surface in comparison to those with mirror surface owing to increase of light scattering processes.

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