Et 2In IIIS 2CNEt 2), has been explored for vapor deposition techniques. Production from volatile complexes of indium and sulfur, for example dithiocarbamates (e.g. Indium sulfide is usually prepared by direct combination of the elements. The unstable γ-In 2S 3 polymorph has a layered structure. It has been proposed to replace the hazardous cadmium sulfide, CdS, as a buffer layer in solar cells, and as an additional semiconductor to increase the performance of TiO 2-based photovoltaics. Β-In 2S 3 is an N-type semiconductor with an optical band gap of 2.1 eV. The disordered subtype of β-In 2S 3 shows activity for photocatalytic H 2 production with a noble metal cocatalyst, but the ordered subtype does not. In the T-In 2S 3 subtype, the tetragonally-coordinated vacancies are in an ordered arrangement, whereas the vacancies in C-In 2S 3 are disordered. A portion of the tetrahedral interstices are vacant, which leads to the defects in the spinel. The sulfide anions are closely packed in layers, with octahedrally-coordinated In(III) cations present within the layers, and tetrahedrally-coordinated In(III) cations between them. Another phase transition at 740 ☌ produces the layered γ-In 2S 3 polymorph. The polymorph undergoes a phase transition at 420 ☌ and converts to the spinel structure of β-In 2S 3. In 2S 3 features tetrahedral In(III) centers linked to four sulfido ligands. Reich and Richter determined the existence of indium as a new element from the sulfide precipitate. Indium sulfide was the first indium compound ever described, being reported in 1863. In 2S 3 is attacked by acids and by sulfide. The red, β, form is considered to be the most stable form at room temperature, although the yellow form may be present depending on the method of production. Three different structures (" polymorphs") are known: yellow, α-In 2S 3 has a defect cubic structure, red β-In 2S 3 has a defect spinel, tetragonal, structure, and γ-In 2S 3 has a layered structure. It has a "rotten egg" odor characteristic of sulfur compounds, and produces hydrogen sulfide gas when reacted with mineral acids. Indium(III) sulfide (Indium sesquisulfide, Indium sulfide (2:3), Indium (3+) sulfide) is the inorganic compound with the formula In 2 S 3.
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