Synthesis,Assembly And Photoelectric Properties Of Tetrahedral Copper Indium Chalcogenide T5 Cluster

Due to stable structures and good photoelectric properties,copper indium chalcogenides have been used in the preparation of a series of new thin-film solar cells and have become promising materials in photovoltaic field in recent years.However,most of copper-indium chalcogenide cluster materials are polymers with a very low solubility in common solutions.Therefore,the preparation of photovoltaic films often requires special processes.The study of homogeneously dispersed solution systems for these materials is still progressing very slowly.It is particularly important to obtain an optoelectronic device that is easy to prepare and easily obtainable precursor solution for photoelectric devices.In this research,a new kind of copper-indium chalcogenide crystal compound was synthesized by an economical and practical one-step using situ solvent thermal synthesis method.The structure was a discrete supertetrahedral T5 nanocluster.We have found a novel method that can make discrete clusters dispersed in solution,which provides a new method to study dispersed clusters.At the same time,we have further explored the re-assembly of this homogeneous discrete cluster solution.Transition metal halide ions are used to bridge the T5 single clusters in solution to obtain a porous polychalcogenide materials.A series of measurements are performed to study the film properties.The main research content of the paper includes:Part ?,the introduction part mainly includes two aspects of the research content.One is focused on the synthesis methods and early research progress of indium and chalcogenide compounds.The other is concerned with the development process of discrete tetrahedral?Tn?indium chalcogenide compounds and a series of assembly processes based on Tn clusters.The performance of these clusters and the ideas for this project were also introduced.Part ?,a ternary discrete supertetrahedral T5 CuInS nanoclusters compound was first synthesized with high yield and low toxicity.This compound is a potential semiconductor photoelectric material with a band gap of 2.15 eV and can maintain high stability at room temperature.A unique method to uniformly disperse T5 clusters in LiBr-DMF solution was found.The nanoclusters in the solution were modified by wet spin coating on an ITO glass electrode with TiO₂ substrate,and the photocurrent and photocatalytic properties were further measured.This work created a simple method for the wet modification of nanoclusters.Part ?,based on the above T5 discrete cluster solution,transition metal ions are further introduced to bridge a single copper-indium chalcogenides nanocluster to form a new type of multi-component chalcogenide material?CuMInS,M=Zn,Cd?with larger pores,which was characterized by a series of tests?XPS,SEM,BET,etc.?.A nickel-foam-CuMInS electrode was prepared and cyclic voltammetry,capacitance and impedance properties were measured.The results show that the new compound sample obtained by this method has good electrochemical performance.