Polishing of CdTe, Cd(Zn)Te, Cd(Mn)Te Single Crystals by Iodine in Dimethylformamide

V.G. Ivanitska; P.M. Fochuk

doi:10.15330/pcss.23.2.322-327

Authors

V.G. Ivanitska Yuri Fedjkovych Chernivtsy National University, Chernivtsy, Ukraine
P.M. Fochuk Yuri Fedjkovych Chernivtsy National University, Chernivtsy, Ukraine

DOI:

https://doi.org/10.15330/pcss.23.2.322-327

Keywords:

CdTe solid solutions, single crystal, etching rate, chemical-mechanical polishing, dimethylformamide, iodine

Abstract

The process of chemical-mechanical polishing of CdTe, Cd_0,9Zn_0,1Te and Cd_0.95Mn_0.05Te surface by etchants, based on solutions of the I₂-dimethylformamide system, has been studied. Ethylene glycol and lactic acid were used as modifying components. The dependences of chemical-mechanical polishing rates on the content of ethylene glycol and lactic acid in the composition of the basic solution have been studied. The technological stability of the developed etchants has been determined. Qualitative characteristics of the surface are established by atomic force microscopy and non-contact profilographic analysis. Based on the obtained results, the compositions of etching solutions and technological modes of chemical-mechanical treatment of CdTe, Cd_0,9Zn_0,1Te and Cd_0.95Mn_0.05Te single crystals were optimized. Etchants modified with an organic component are promising for use in the semiconductor materials technology in the case when the main goal is to obtain high-quality, clean from contaminants and impurities, structurally perfect surface.

References

W. Mönch, Semiconductor Surfaces and Interfaces (Springer Series on Surface Sciences, (Springer Berlin, Heidelberg, 2001); https://doi.org/10.1007/978-3-662-04459-9.

A. Vilan and D. Cahen, Chem. Rev., Chemical Modification of Semiconductor Surfaces for Molecular Electronics 117(5), 4624, (2017); https://doi.org/10.1021/acs.chemrev.6b00746.

R.A. Awni, D.-B. Li, C.R. Grice, Z. Song, M.A. Razooqi, A.B. Phillips, S.S. Bista, P. J. Roland, F.K. Alfadhili, R.J. Ellingson, M.J. Heben, J.V. Li and Y. Yan, Solar RRL, The Effects of Hydrogen Iodide Back Surface Treatment on CdTe Solar Cells 3(3), 1800304 (2019); https://doi.org/10.1002/solr.201800304.

J.M. Kurley, M.G. Panthani, R.W. Crisp, S.U. Nanayakkara, G.F. Pach, M.O. Reese, M.H. Hudson, D.S. Dolzhnikov, V. Tanygin, J.M. Luther, and D.V. Talapin, Transparent Ohmic Contacts for Solution-Processed, Ultrathin CdTe Solar Cells, ACS Energy Lett. 2(1), 270, (2017); https://doi.org/10.1021/acsenergylett.6b00587.

E. Bastola, F.K. Alfadhili, A.B. Phillips, M.J. Heben, R.J. Ellingson, Wet chemical etching of cadmium telluride photovoltaics for enhanced open-circuit voltage, fill factor, and power conversion efficiency, J. Mater. Research 34(34), 3988 (2019); https://doi.org/10.1557/jmr.2019.363.

Z.F. Tomashik, V.G. Ivanitskaya, V.N. Tomashik, P.I. Feichuk, and L.P. Shcherbak, Effect of Surface Orientation on the Chemical Etching of CdTe Single Crystals with Iodine in Dimethylformamide, Russian J. Inorgan. Chem. 50(11), 1651 (2005).

V.G. Ivanits’ka, P. Moravec, J. Franc, V.M. Tomashik, Z.F. Tomashik, K. Masek, P.S. Chukhnenko, P. Hoschl, J. Ulrich, J. Electron. Mater., Chemical Polishing of CdTe and CdZnTe in Iodine–Methanol Etching Solutions 40(8), 1802, (2011); https://doi.org/10.1007/s11664-011-1649-2.

M. Chayka, Z. Tomashyk, V. Tomashyk, G. Malanych, A. Korchovyi, Appl. Nanosci., Formation of nanosized relief on the CdTe single crystals surface by bromine-emerging etchants 12, 603, (2022); https://doi.org/10.1007/s13204-021-01716-8.