Study On Hydrothermal Deposition Fabricated Antimony Sulfide-Selenide Solar Cells

Energy is closely related to human survival and development,and is the cornerstone to support the normal operation of human society.With the development of society and the advancement of science and technology,the traditional fossil energy is likely to be exhausted.So people turn their attention to new renewable energy technology.As a kind of inexhaustible and clean energy,solar energy is regarded as the most promising renewable energy source.Up to now,many kinds of photovoltaic materials have been developed.As a kind of inorganic light harvesting materials,antimony sulfide(Sb2S3)and antimony selenide(Sb2Se3)have attracted people's attention due to their abundant reserves,non-toxic elements,suitable optical band gap and large absorption coefficient.In addition,this kind of material has good water and oxygen stability,various preparation methods and relatively low price,providing the possibility for large-scale industrial production.In this paper,the antimony sulfide thin film was deposited by hydrothermal deposition method.The films and their devices obtained under different experimental conditions were analyzed and characterized.Furthermore,we used hydrothermal deposition method to prepare dense,flat antimony sulfide selenide films with larger grains.Besides,it was found that the band gap of the film could be easily regulated by adjusting the ratio of sulfur source and selenium source.The advantages of antimony sulfide and antimony selenide were combined in the devices prepared by using antimony sulfide selenide films as the absorbing layer,and it provides a basis of material property regulation for improving the photoelectric conversion efficiency.This paper discussed from the following five aspects.Chapter 1 introduces the development history,working principle and main performance parameters of solar cells,and explains the classification of solar cells.Besides,the research projects and research methods of this paper are proposed.In chapter 2,the deposition methods of functional layers are involved,and then we introduced the characterization method of thin films and devices used in this paper.In Chapter 3,antimony sulfide films were prepared by hydrothermal deposition method.We explored the effects of annealing temperature and deposition time on the properties of films and the performance of devices.And we proposed a hydrothermal system for depositing high-quality antimony sulfide films.In chapter 4,we used hydrothermal deposition method to obtain antimony sulfide selenide films.And devices were fabricated using these films.It was found that the addiction of selenium in the absorption layer can realize the adjustment of the optical band gap of the films,and the obtained antimony sulfide selenide films were more suitable as absorber layers of solar cells.We optimized the performance of the devices by changing experimental conditions,and finally the device achieved an optimal photoelectric conversion efficiency of 7.41%.In chapter 5,we summarized the conclusions of the research.And we reflected the shortcomings of the research and prospected the future development directions.