Synthesis Of A New Type Of Copper Indium Chalcogenide And Preparation Of Its Thin Film By Solution Process

The solar cells with thin films of inorganic copper-indium chalcogenide has obtained advantages of cost effective, high photoelectric conversion efficiency, stable performance and so on. Due to the poor solubility of copper indium chalcogenide(Cu In S2) materials, the nano ink printing method is mostly adoped to prepare its film, despite the complex process. Other methods like solution process, however, involve toxic hydrazine hydrate as the solvent. Taking the safety, environment, and cost into consideration, there’s still a long way to go. In this thesis, on the one hand, a new crystal [Cu4In16S35H4]2[Cu12S8]·32Hen has been prepared and it is soluable at some circumstance. The thin film of Cu In S2 is prepared through spin-coating the solution of crystals. A preliminary device is further designed using the Cu In S2 film to test its photocurrent properties. On the other hand, after introducing two organic function cations into a thioindate-thioantimonate with 2-D inorganic structure, the ion-exchange products are studied by several tests. The primary coverage of the thesis is as follows:Part I, the overall introduction includes the structures and the characteristics of the chalcogenides, and their main application in ion exchange, photoelectric responds and so on. In addition, the research progress of synthesis and properties of various chalcogeniades solar cells will be summarized.Part II, a new compound [Cu4In16S35H4]2[Cu12S8]·32Hen is synthesized. It is constructed by the discrete T4(Tn, where T means tetrahedral and n is the number of metal layers in the cluster) tetrahedral [Cu4In16S35H4]14- clusters and discrete [Cu12S8]4- cubic clusters that fill the inter-T4-cluster cavities. The crystal of compound separates out from the mother liquor containing of coppor, Indium, excessive sulfur and ethylenediamine. However, under moist condition or calcination, generally its colour turns from red to black. We adopt ultraviolet visible spectra(UV-vis), microscopic IR to study the optical properties of crystals before and after discoloration, and the three-electrode-system is also employed to test its photocurrent responses. The results indicate that blackend crystals have good performance. Compound 1 can be expected to be the precursor for near-infrared absorption material.Part III, Using the above mentioned clear solution containing of copper, indium, excessive sulfur and ethylenediamine, the films with different transmittance and thickness are prepared using spin coating and then sintering methods. The film is composed of Cu In S2 identified through X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS) etc. This method produce the layer of Cu In S2 mainly by solution, which is relatively simpler and easier to control than other ways. Besides, a simple solar cell is constructed using Cu In S2 layer modified titanium dioxide(Ti O2) and the photoelectric properties are also investigated.Part IV, we herein select an inorganic structure from the [(CH3CH2CH2)2NH2]5In5Sb6S19 · 1.45 H2 O which concludes permeable layers with large Windows, introducing two species of methylviologen into the interlayer and studying the characterization and photocurrent performance of the production after the intercalation.