Physical, optical and nonlinear properties of InS single crystal

Abstract

Indium Sulphide (InS) single crystals are successfully grown by In flux. Single crystal X-ray diffraction shows orthorhombic structure of Pnnm space group. Ellipsometry measurements performed on the (010) oriented crystal exhibit low anisotropy in the 300-1000 nm wavelength range and consequently negligible THz emission is observed. Optical band gap of $2.09 eV$ is deduced from linear optical measurements. Nonlinear optical properties are studied by single beam Z-scan measurements at 800 nm, where two-photon absorption is present. Nonlinear refractive index and absorption coefficient are estimated to be $\eta_2$ = $2.3 10^{-11} cm^2/W$ and $\beta$= $62.4 cm/ GW$, respectively for excitation intensity of $0.32 GW/cm^2$. The origin of nonlinearity in InS crystal is accounted to be due to the third-order anharmonic motion of the bound electrons.Comment: 15 pages, 4 figures, 1 tabl

First‐principles Calculations of InS‐based Nanotubes

“…The atomic structure of InS bulk crystal was completely optimized before performing the calculations of layers and nanotubes. The obtained lattice parameters and atomic positions in the orthorhombic cells are close to the experimental values (see Table ). The calculated band gap of 2.12 eV almost coincides with the experimental value of 2.09 eV …”

“…Everywhere below we will refer to this stable polymorph as InS (I). InS has a quasi‐layered structure, with a three‐dimensional network, in which In atoms have tetrahedral coordination (three S atoms and one In atom), whereas each S atom is three‐fold coordinated ,…”

“…[a] Experimental structure data from Ref. . [b] Experimental structure data for InSe are given for comparison.…”

“…Literature concerning the preparation and physical properties of InS bulk crystal is relatively rare, due to the difficulty of growing large single crystals. Nevertheless, the structural properties of the crystal are fairly well established, and the crystal structure of InS can be considered as a three‐dimensional network that is different from a layered structure of its counterparts (GaS, GaSe, InSe). There have been several studies on the optical absorption and electrical conductivity of InS.…”

Formation of Colloidal Copper Indium Sulfide Nanosheets by Two-Dimensional Self-Organization

“…This resulted in k -meshes of 14 × 14 × 4 for the covellite structure, 6 × 6 × 4 for 2 × 2 × 1 supercells of the covellite structure, 14 × 14 × 8 for the chalcopyrite structure, and 16 × 8 × 18 for the orthorhombic InS structure. 40 Both the crystal lattice and the atomic coordinates were fully relaxed. The formation enthalpy is defined with respect to pure CuS covellite and pure InS covellite as For ligand-covered configurations, supercells were constructed that were 58 Å in height, containing a vacuum slab at least 22 Å thick.…”