Optical absorption, piezoelectric effect and second harmonic generation studies of single crystal AgGaGe3Se7.6Te0.4 solid solution

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2017-03, Vol.123 (3), p.1-8, Article 175
• Main Authors: Myronchuk, G. L., Lakshminarayana, G., Kityk, I. V., Krymus, A. S., Parasyuk, O. V., Rudysh, M. Ya, Shchepanskyi, P. A., Piasecki, M.
• Format: Article
• Language: English
• Subjects: Absorption; Anisotropy; Applied physics; Characterization and Evaluation of Materials; Condensed Matter Physics; Crystal structure; Crystals; Energy gap; Machines; Manufacturing; Materials science; Nanotechnology; Optical and Electronic Materials; Physics; Physics and Astronomy; Piezoelectricity; Processes; Rietveld method; Room temperature; Second harmonic generation; Single crystals; Solid solutions; Surfaces and Interfaces; Temperature; Thin Films
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-017-0823-7

Spectral features of absorption were studied for novel AgGaGe 3 Se 7.6 Te 0.4 solid-state alloys at different temperatures. The synthesized crystals structure parameters are obtained by the X-ray Rietveld refinement method. During increasing temperature from 100 up to 300 K, the energy gap of AgGaGe 3 Se 7.6 Te 0.4 decreases linearly from 2.05 up to 1.94 eV at a rate 5.7 × 10 −4 еV/K. The magnitudes of piezoelectric coefficients are significantly changed and demonstrate substantial anisotropy. At room temperature, these values are equal to 5.2 pm/V ( d 11 ), 31.5 pm/V ( d 22 ) and 35.5 pm/V ( d 33 ). It is crucial that with an increasing temperature the piezoelectric efficiencies are increased. We have explored temperature and laser-induced changes of piezoelectric coefficients.