Study Of Optical And Electrical Properties Of Organic Solar Cells Based On Fdfd Method

Organic solar cells have become a hot research topic in the new energy field due to their advantages of light weight,low cost,low energy consumption,easy manufacture,good ductility and compatible easily with other devices.However,the low photoelectric conversion efficiency of organic solar cells has still been the bottleneck of organic solar cell research.Therefore,improving the photoelectric conversion efficiency of organic solar cells is still the focus of today's research.In this thesis,metal nanostructures are added into organic solar cells and surface plasmon resonance is used to enhance optical absorption,so as to improve the photoelectric conversion efficiency.At the same time,the photoelectric characteristics of organic solar cells under oblique incidence are also investigated.Then,the photoelectric characteristics of small period organic solar cells are also studied.In this thesis,finite difference frequency domain(FDFD)method is used to deal with equtions of organic solar cells,then the photoelectric characteristics of the solar cells are studied and analyzed.The main research of this paper is following:1.The basic theory of organic solar cells is briefly introduced,including organic solar cell development process,basic structure,working principle and measurement performance parameters.On the basis of traditional organic solar cells,the surface plasmon nanostructures are introduced,and the principle of surface plasmon resonance(SPR)effect on improving the photoelectric conversion efficiency of organic solar cells is introduced.2.The basic principle of frequency domain finite difference method is introduced,and making comparison with other algorithms.Frequency domain finite difference method has great advantages to treat frequency domain problem,oblique incidence problem and periodic structure problem.Then,FDFD method is introduced into the research of organic solar cells to solve Maxwell's equation,Poisson equation and drift diffusion equation of organic solar cells.3.On the basis of traditional organic solar cells,Ag nanograting structure is introduced.And surface plasma effect is used to enhance the absorption of organic solar cells,thereby improve the photoelectric conversion efficiency.At the same time,optical and electrical properties of organic solar cells are studied under oblique incidence.4.Reducing the period of organic solar cells with Ag gratings,light absorption and photoelectric conversion efficiency of small-pitch organic solar cells are studied.Then,changing grating spacing,we investigate effects of grating interval width on optical and electrical properties of organic solar cells.