Interface Optimization Of Perovskite Solar Cells Based On Inorganic Hole Conductor Layers And Electrochemical Energy Storage Properties Of Three-Dimensional NiCo₂S₄ Fibrous Electrodes

With the rapid development of science and technology and the continuous growth of population,the energy crisis is a maj or challenge on the road of human civilization.In terms of energy conversion,perovskite solar cells have developed rapidly in recent years.The advantages of high photoelectric conversion efficiency,simple preparation method,low price and abundant raw materials make them the darling of new energy fields.In terms of energy storage,supercapacitors are considered to be an important energy storage device due to their fast charge and discharge speed,high power density and long service life.Supercapacitors have much higher power densities and energy densities than batteries and conventional capacitors.In this paper,the energy conversion is mainly focused on the preparation process and performance optimization of multi-system planar heterojunction perovskite solar cells.The spin-coating process of perovskite films and the inorganic hole transport layer material suitable for the system were explored,and the mechanism of the action of BCP as a buffer layer between the PCBM layer and the Ag electrode was deeply studied.In terms of energy storage,we applied electrospinning technology to the synthesis of electrode materials,and combined them with hydrothermal reaction to synthesize two new structures of NiCo2S4.And their electrochemical energy storage properties were tested as well.The main innovations and achievements of this paper are outlined as follows:1.The spin-coating process of Cs0.08(MA0.17FA0.83)0.92Pb(I0.83Br0.17)3 perovskite thin films was explored,and NiOx was used as a hole transport layer to assemble a planar heterojunction perovskite solar cell.The efficiency of such PSCs was 12.69%.2.Bathocuproine(BCP)was first employed as the interface buffer layers between the PCBM and Ag layers to improve the performance of Cs0.08(MA0.17FA0.83)0.92Pb(I0.83Br0.17)3 perovskite solar cells based on NiOx hole transporting layers.The effect of different evaporation times on the device performance at the same evaporation temperature(100 ?)was carefully investigated.The optimum device efficiency of 14.47%was obtained by evaporating BCP for 36 s,suggesting an enhancement of 14%as compared to the cell without BCP modification.3.The three-dimensional NiCo2S4 nanofibers were directly obtained by electro spinning technology for the first time.In the experiment,electrospinning technology and hydrothermal reaction were combined to prepare tubular fiber and hexagonal petal NiCo2S4 compounds.The corresponding flexible electrodes were fabricated and showed excellent electrochemical energy storage performance.