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Proceedings Paper

Semiconducting ferroelectric SbSI quantum dots in amorphous matrix: preparation and nonlinear optical properties
Author(s): Hui Ye; Ligong Yang; Peifu Gu
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Paper Abstract

Semiconducting ferroelectric antimony sulphoiodide (SbSI) microcrystallite doped organically modified TiO2 thin films were successfully fabricated with the sol-gel process. Ferroelectric SbSI crystallites have some attractive properties, including high dielectric permittivity, high electro-optical coefficient and high photoconductivity. SbSI is also an intrinsic semiconductor with a relatively narrow eneryg gap. The Bohr radius of the SbSI crystal was calculated larger than other semiconductors due to its large dielectric constant. If the crystal size is smaller than its Bohr radius and the microcrystallite are dispersed in a suitable matrix, a dramatic improvement of the nonlinear three-order nonlinearity will be achieved due to the quantum confinement effect. The SbSI quantum dot composites were proved to be good candidates for nonlinear and electro-optical devices. Glycidopropyltrimetroxysilane modified TiO2 was chosen as the matrix and SbSI was synthesized in situ by using SbI3, SC(NH2)2. The materials in thin film were heat-treated in different conditions and the size of the microcrystallite was characterized by the XRD. A value of 3.5pm/V of effective transverse electro-optical coefficient reff for the nano-composite containing 8 wt percent of antimony sulfide iodide was measured. The third-order nonlinear optical susceptibility of the SbSI quantum dot thin film was measured by degenerate four-wave mixing at 532nm using a frequency double Nd:YAG laser beams with a pulse width of around 10ns, the x(3) value of 3 μm sample was measured to be 6 × 10-11 esu.

Paper Details

Date Published: 17 September 2002
PDF: 6 pages
Proc. SPIE 4918, Materials, Devices, and Systems for Display and Lighting, (17 September 2002); doi: 10.1117/12.483042
Show Author Affiliations
Hui Ye, Zhejiang Univ. (China)
Ligong Yang, Zhejiang Univ. (China)
Peifu Gu, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 4918:
Materials, Devices, and Systems for Display and Lighting
Fuxi Gan; Ming Hsien Wu; Lionel C. Kimerling, Editor(s)

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