Synthesis, Structures And Properties Of 2-D Chalcogenides

H₂eteronuclear metal chalcogenide compounds are attractive not only due to their fascinating architectures and topologies but also their applications in areas of semiconductors and photovoltaic materials. Two dimensional compounds have got increasing interest because of their unique 2-D structural character and hence enrich their physical properties. The research goal of this work is integrating some photoelectric active organic ligands with inorganic chalcogenide segments using the solvothermal method, to synthesize unique organic-inorganic hybrid 2-D structural chalcogenide compounds, and to study their unique structures and photo-current response properties.1. Solvothermal syntheses of main-group metal chalcogenides and their structures are summarized briefly. Synthesis, structures and properties of hetero-metal chalcogenide compounds are also discussed. The 2-D chalcogenide compounds are emphasized in discussion.2. Unique In-Sn-Q ternary compounds with 2-D structure are synthesized by solvothermal method, [Fe（Phen）₃][（In/Sn）₄S8]·0.5（Dah）·2H₂₂O（1）,[Fe（Phen）₃][（In/Sn）₄Se8]·0.5（Dah）·2H₂₂O（2）, [Co（Phen）₃][（In/Sn）₄Se8]·0.5（Cha）·2H₂₂O（3）,in which the M-phen cations act as structure-directing ions and charge balance agent. The anionic network of these compounds is a two-dimensional porous framework. The[M（Phen）₃]²⁺cations are sandwiched between the layered anions and part of the cations extends into the porous window of the anions and stabilizes the anion network. These compounds show improved photo absorption properties due to the cation-centered M-to-Phen charge transfer（MLCT） and cation-anion charge transfer.3. A kind of new organic-inorganic intercalation chalcogenide materials Zn S（AN）n are prepared by solvothermal method. The fundamental structure of these compounds are two-dimensional material, and protonated aniline cations are intercalated in the inorganic layers to be Zn S-（AN）n-Zn S structure. The morphologies and thickness of these materialsare time-dependent. The best photo-current responsive material is found for the thin disc samples.