Synthesis And The Property Study Of Pyrite FeS₂ Micro Nano Materials

In recent years,as the large scale development and utilization of traditional energies,problems like climate change and environmental damage are threatening the sustainable development of human.Now solar cells are developing fast,and the key problem is to seek appropriate materials which used to prepare solar cells.Pyrite FeS₂ has attracted considerable interests as a promising photovoltaic application material because of its suitable band gap,high light absorption coefficient,vast abundance and nontoxicity.Early researches show that there are still some problems when synthesizing pyrite FeS₂,for example,impurities hard to remove,inhomogeneous products with big sizes,surface structure of FeS₂ films with distortion and complex synthesis processes,these challenges need researchers to solve.According to the present research status of pyrite FeS₂,this paper’s main contents can be summarized as follows:Utilizing a novel microwave-assisted synthesis method successfully obtained pure-phase pyrite FeS₂ microspheres.The products were uniform and with good crystallinity.The study showed that the microspheres’ absorption performance were strong,surfactants could influence the phase,morphology and absorption property of the products.A relatively long reaction time was ideal to the formation of uniform microspheres with smooth surfaces.The microwave-assisted method can rapidly synthesise uniform pyrite FeS₂ with better absorption property than the high-pressure solvothermal heating method.A single precursor was utilized to synthesis pyrite FeS₂ in two ways.In the way of using three necks flask,the influences of ratio of Fe to S and reactants concentration on products’ crystal type,morphology and property were studied.In the way of using reaction kettle,hierarchical microparticles were obtained.The mechanism,morphology evolution processes and the role of ethylenediamine were studied.This research simplified the operation and reduced the cost of experiment by utilizing the single precursor.Also,the research provided an effective way for synthesizing polymorphic appearance of pyrite FeS₂.Pyrite FeS₂ nanocrystalline obtained in this article was used as sensitization agent in TiO₂ dye-sensitized solar cell,the experimental results showed that FeS₂ could increase the photoelectric property of DSSC.What’s more,Voc and Jsc was proved to increase first and then decline as the increase thickness of FeS₂/TiO₂ film which caused by the increase of screen printing times.