학술논문

CuInSe2 나노소재의 합성 및 분석 / Syntheses of CuInSe2 Nanomaterials and Their Characterization
Document Type
Dissertation/ Thesis
Author
Source
Subject
Language
English
Abstract
CuInSe2 is a I-III-VI2 semiconductor compound with properties suitable for photovoltaic applications. Laboratory-scale solar cells using this compound had reached efficiency values up to 17%. CuInSe2 is deemed as a potential material for thin-film solar cells due to its high optical absorption coefficient, high stability and low band gap. In this chapter, we present an aqueous phase synthetic route for CuInSe2 nanoparticles. In our synthesis, the Se precursor used was Na2SeSO3 and CuI and InCl3 were used as precursors for copper and Indium, respectively. The reaction was performed in water under basic condition in the presence of thioglycolic acid (TGA). It was concluded form our results that the metal ions were stabilized by TGA in aqueous media.
This is general introductory chapter and highlights a brief account on the chemistry of CuInSe2 nanomaterials and its applications. Here, we have described the various processes of CIS and its uses in solar cells. The concluding part of this chapter gives a brief account on the works that has been done by different groups in the field of CIS nanomaterials.
Copper indium diselenide (CuInSe2) is a semiconducting compound which belongs to group I, III and VI chalcopyrite family. CuInSe2 is a promising material for thin film solar cells because of its extraordinary radiation stability, have band gaps that match well with the solar spectrum, have large absorption coefficients, and avoid the use of overly toxic elements. In past years, solar cells based on CuInSe2 have been reported with an efficiency of nearly 17 %. CISe nanocrystals have previously been made by standard synthetic methods such as solvothermal techniques, Co-evaporation techniques, Electrodeposition and Sputtering techniques. Specially, a solution phase method is not only the cheapest way to make nanocrystals but also helps in making large scale at once. Although several methods have been reported which describe the synthesis of CISe and related Hexagonal platets and tetragonal nanowires, nanoparticles, nanowhiskers, nanorods, nanotubes, nanorings and pyramidal shapes. As a continuation of our previous studies, here, we have synthesized chalcopyrite CuInSe2 nanoplates using the above sources and coordinating solvent oleylamine followed by complete characterization of the nanoplates.
Copper selenides are p-type semiconductors having potential applications in solar cells, optical filters, nanoswitches, thermoelectric and photoelectric transformers and superconductors. Synthesis of CuSe nanomaterials in various morphologies has attracted much attention due to their physicochemical properties and applicability. The third chapter presents a novel solution-phase synthetic route for obtaining hexagonally shaped nanoplatelets of copper selenide. Chemical reaction involved in the synthesis is the reduction of copper selenite (CuSeO3) with hydrazine hydrate. The reaction is performed in various solvents and in presence of different capping agents. The structure, composition and properties of the nanomaterials obtained were studied with various techniques. The reduction reaction carried out in ethylene glycol even in the absence of any capping agents gave the best results. The relatively low temperature of reaction, usage of single precursor and the surfactant-free growth of nanomaterials make this synthetic route a promising one in perspectives of material science and nanochemistry.