Preparation And Research Of Perovskite Optoelectronic Devices Based On CuSCN Inorganic Hole-Transport Layer

Energy crisis is a major problem that all mankind must face in the 21 st century.At present,the rapid development of human economy mainly benefits from the earth’s coal mines,oil,natural gas,etc.But these kinds of resources are non-renewable.To maintain human’s development,we must focus on renewable energy.Solar energy is one of the most ubiquitous,widest used,and environment protecting energy.So,how to make good use of solar energy is a research fever at present.Perovskite material has been researched as photovoltaic semiconductor materials in the past decade.Perovskite solar cells have the characteristics of low cost and high energy conversion efficiency,and have great potential to replace expensive silicon-based solar cells.For applications,in addition to perovskite absorption layer,perovskite solar cells also need the cooperation of electron-transport layer and hole-transport layer,which could improve the carrier transmission capacity,make the device stable and improve the efficiency.However,the traditional hole-transport material Spiro-OMeTAD is extremely costly and require multiple materials doping to maximize the hole transmission rate,which is unfriendly to large-scale production and commercialization.But CuSCN,another kind of hole transmission material,is an ideal material that can replace Spiro-OMeTAD due to its low defect density,high hole mobility and low cost.Based on the principle properties of perovskite materials,the perovskite solar cell was firstly fabricated and explored around its hole transport layer CuSCN material.In the research process,the device was optimized to prepare the traditional mesoporous structure perovskite solar cells,and analyzed the conclusion that the influence of solvent on the perovskite in the mesoporous structure leads to a higher carrier recombination rate.So the inversion structure is studied,and the film formation status of the device is analyzed.After the process is improved,including the control of the annealing temperature and the concentration of the solution,to obtain the best preparation method,and to improve the efficiency of the battery.Finally,from the aspect of stability analysis,through the regulation of the halogen elements of the perovskite material,the efficiency of the preparation of the perovskite solar cell reached 15.7%,and the stability without significant degradation within 15 days.After that,it was found that CuSCN is an ideal material for the preparation of Photogating high-reactivity detectors because of its excellent hole transporting performance and high light transmission coefficient.The channel transmission based on perovskite is based on CuSCN.The layer photodetectors are controlled by different temperature annealing processes to obtain the best results.After the structure is further optimized,the response time is successfully reduced.Finally,it is found in the experiment that the detector also has a good detection effect on weak light,which has important research significance.