Study On Synthesis Of CIGS Powder By Self-propagating High-temperature Synthesis

The limit of fossil energy and environment problems caused by its use badly influence the sustaining development of economy and society.Solar energy is advantaged and potential because it is a kind of new energy with clear,safe,no pollution,and no bad effect on environment and reproducible.Cu(In,Ga)Se₂ received more and more attention as absorber layer of solar cell due to its optimum energy band gap and extraordinarily high absorption coefficient and long-term stability without any signs of degradation,high photoelectric conversion efficiency,low-cost and envi-ronmental protection.At present,the Cu(In,Ga)Se₂ films for high efficient solar cell are prepared either by multi-sourse thermal evaporation or sputtering and selenization.However,the co-evaporation is difficult to scale up for the mass production because of its vacuum process and expensive equipments.The sputtering and selenization process is not adequate for environmental point of view of using toxic H₂Se gas.Recently,one class of non-vacuum deposition techniques is nonvacuum processing of particulate materials.The method of deposition offers a simple inexpensive alternative for fabrication of high efficiency CIGS solar cells.Particle precursors can be deposited in thin layers using simple atmospheric-pressure techniques such as screen printing,spraying and dip coating.CuIn_0.7Ga_0.3Se₂ were synthesized using the elemental Cu,In,Ga and Se powders by Self-propagating High-temperature Synthesis method.A reaction initiated from the sample surface by a heated coil and sustained by itself with generating a large amount of heat and strong light emission.The samples synthesized by SHS are milled and dealed by planet milling,high energy milling and micros milling for preparing the painting ink.The phase and crystallographic structure,chemical composition of the products were analyzed by X-Ray Diffraction,X-Ray Photoelectron Spectroscopy,Energy Dispersive X-Ray,Laser Raman Spectroscopy,X-Ray Fluorescence.The morphologies were examined by scanning electric microscopy.The different influence factors in this process such as reactant ratio,atmosphere pressure and temperature were investigated in detail.The result showed:stoichiometric crystallographic chalcopyrite-type CIGS can be prepared by Self-propagating High-temperature Synthesis.The CIGS nano-particle is available for the requirement of painting to produce CIGS thin film by milling.