Preparation and Optical Properties of Substrates with Surface Nanostructure

Authors V.P. Makhniy1, G.I. Bodyl1, M.F. Pavlyuk2, O.М. Slyotov1

1 Yuriy Fedkovych Chernivtsi National University, 2, Kotsubinskiy Str., 58012 Chernivtsi, Ukraine

2 Vasyl Stefanyk Precarpathian National University, 57, Shevchenko Str., 76018 Ivano-Frankivsk, Ukraine

Issue Volume 9, Year 2017, Number 5
Dates Received 28 July 2017; published online 16 October 2017
Citation V.P. Makhniy, G.I. Bodyl, M.F. Pavlyuk, O.М. Slyotov, J. Nano- Electron. Phys. 9 No 5, 05026 (2017)
DOI 10.21272/jnep.9(5).05026
PACS Number(s) 61.46. – w,68.37.Ps, 78.30.Fs,78.55. – m
Keywords Cd1-xMnxTe solid solutions, annealing (16) , АFM-topograms, Surface nanostructure (2) , Nanopyramids, Luminescence (24) , Differential optical transmission spectra.
Annotation It is experimentally established that thermal annealing of single-crystal substrates of Cd1-xMnxTe (x  0.04-0.45) solid solutions in the air at 920 K results in formation of surface nanostructure (SNS). In so doing, optimal annealing time ta for each molar composition х is determined by empirical expression ta ≈ 35 + 1.3·x, min. Analysis of АFM-topograms shows that SNS is a set of pyramids with the base size 2-5 µm, which are a combination of smaller 10-100 nm nanopyramids. The result of size quantization in the latter is luminescence band in the energy region ħ larger than the energy gap of material Eg, and its maximum ħωm with increasing х is displaced toward high-energy region. Large half-width of this band is due to considerable spread in dimensions of small nanopyramids. Displacement of maxima of bands of differential optical transmission spectra of substrates with SNS to low-energy region is explained by joint action of light absorption and scattering with participation of free pyramids.

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