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Determining the sub-surface damage of CdTe single crystals after lapping

  • O. Šik
  • L. Škvarenina
  • O. Caha
  • P. Moravec
  • P. Škarvada
  • E. Belas
  • L. Grmela
Article

Abstract

We introduce an affordable and easy-to-implement method of determining the thickness of a mechanically damaged layer on the surface of a cadmium telluride single crystal after mechanical lapping. This method is based on This method is based on different usage of already known defect-revealing etchants: the side projection of the lapped surface. A comparison of developed etch pit patterns in the vicinity of the lapped side etched by the Everson solution, Nakagawa solution, Hähnert and Schenk solution, Saucedo solution, Inoue E-Ag II solution and FeCl3 is provided. The most commonly used defect-revealing etchants the Nakagawa and Everson solutions—did not show any trend of etch pit formation towards a mechanically damaged surface. On the other hand, the Saucedo, FeCl3 and E-Ag II etches were successful and achieved similar results. These etchants revealed three distinctive regions of sub-surface damage: (i) a severely polycrystalline 50 µm deep damaged region with micro cracks. This region was best revealed by the FeCl3 etch. (ii) A region of plastic deformations that is 180 µm deep. This region was best revealed by the E-Ag etch. (iii) A region free from mechanical damage. High-resolution X-ray diffraction (HRXRD) further confirmed the results obtained by chemical methods. Full-width at half maximum of the rocking curves decreased from the value of 1000 arcsec on the lapped surface to the value lower than 30 arcsec after the removal of 200 µm of the surface. From HRXRD analysis, the region (i) can be further divided into an approx. 10 µm thin nearly amorphous region, followed by a microcrystalline region. The region (ii) showed mosaic structure consisted of large crystallic blocks, with low angle misorientation from the main diffraction peak. The results showed that the thickness of the mechanically damaged layer is ten times higher than the size of the abrasive used.

Notes

Acknowledgements

The research described in the paper was financially supported by the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic under the project CEITEC 2020 (MEYS Grant No. LQ1601), CEITEC Nano Research Infrastructure (MEYS Grant No. LM2015041), by the Grant Agency of the Czech Republic under No. GACR 15-05259S and by the National Sustainability Program under grant MEYS LO1401. For the research, infrastructure of the SIX Center was used. The research has been also supported by the Internal Grant Agency of Brno University of Technology, Grant No. FEKT-S-17-4626.

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Authors and Affiliations

  1. 1.Department of Physics, Faculty of Electrical Engineering and CommunicationBrno University of TechnologyBrnoCzech Republic
  2. 2.CEITEC - Central European Institute of Technology, Brno University of TechnologyBrnoCzech Republic
  3. 3.CEITEC - Central European Institute of Technology, Masaryk UniversityBrnoCzech Republic
  4. 4.Department of Condensed Matter Physics, Faculty of ScienceMasaryk UniversityBrnoCzech Republic
  5. 5.Institute of Physics, Faculty of Mathematics and PhysicsCharles UniversityPrague 2Czech Republic

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