SYNTHESIS AND PROPERTIES OF NANOCRYSTALLINE π-SnSe – A NEW CUBIC PHASE OF TIN SELENIDE
1,2
2
2,3
2
1,2
1,2
1Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva
2Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva
3Chemistry Department, Ben-Gurion University of the Negev, Beer-Sheva
2Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva
3Chemistry Department, Ben-Gurion University of the Negev, Beer-Sheva
We report on a new binary phase in the tin mono-selenide system, p-SnSe, which was obtained as cube shaped nanoparticles. The structure and atomic positions was deduced using X-ray diffraction and Rietveld refinement (a0 = 11.939Å, No. 198), and showed a structure which is analogous to the recently reported cubic phase of SnS (a0 = 11.595Å, No. 198). The new cubic SnSe phase was further characterized by Raman and optical absorption spectroscopies. The optical band gap was assessed to be indirect, with Eg=1.28eV (in the near infrared), compared to Eg=0.9eV (indirect) and 1.3eV (direct) eV for the conventional orthorhombic phase of SnSe. DFT calculation has been applied in order to validate the phase stability.
Powered by Eventact EMS