Nanocomposite of semiconducting ferroelectric antimony sulphoiodide dots-doped glasses

Abstract

Antimony sulphoiodide (SbSI) is a semiconducting ferroelectric crystal. The SbSI possesses attractive properties, such as high pizoelectric constant, very high dielectric permittivity, and high electro-optic coefficient, but it is very difficult to grow a single crystal with bigger size. Currently, a method for synthesis of SbSI by liquid reaction has been developed in our laboratory. Nanocomposites of SbSI dots in sodium borosilicate glass as well as in organic modified silicate (ORMOSIL) matrix have been fabricated by the sol-gel technique. The dot size is controlled by processing conditions. The nanocomposites were characterized by x-ray diffraction and high resolution TEM. Quantum confinement effect was observed on optical spectra. Nonlinear optical property, the third order susceptibility χ⁽³⁾. of the SbSI dots-doped glasses was measured by four wave mixing method at 532 nm. The value of χ⁽³⁾ was found to be 6 χ 10⁻¹¹ esu at this non-resonant wavelength.

Key Words:

• semiconducting ferroelectric
• antimony sulphoiodide(SbSI) dots-doped glass
• sol-gel methody
• the third order susceptibility