Interface Transporting Materials And Organic-Inorganic Hybrid Solar Cells

Organic Inorganic hybrid solar cells have a great research and application value in the new energy field because of their simple preparation process and low cost.In recent years,organic inorganic hybrid solar cells,including polymer solar cells,perovskite solar cells,antimony sulfide solar cells,have been intensively studied.In this thesis,in order to optimize the fabrication process and performance of organic inorganic hybrid photovoltaic devices,we studied the relationship between materials and device performances based on the preparation and application of different interface transporting materials.Interface transporting materials with excellent photoelectric properties,high mobility and suitable bandgap are studied and used for solar cells to enhance efficiency and stability.Two-dimension CuS nanosheets were fabricated by in-situ hydrothermal method.The effects of seed layer thickness and hydrothermal temperature and time on the growth process were systematically studied.The high p-type conductivity,high hole mobility and optical transmittance of CuS increased the photoelectric conversion efficiency of the polymer solar cells based on P3HT to 3.5%.While for PBDTTT-C-T system,the photoelectric conversion efficiency was increased to 7.4%.The stability of the devices has been greatly improved.A new type of planar antimony sulfide(Sb2S3)solar cells was designed to decrease the costs caused by useage of polymer acceptors such as PCBM and improve the stability of the devices.A solar conversion efficiency of 2.8%was obtained at 1 sun illumination by a planar antimony sulfide heterojunction solar cells using chemical bath deposited(CBD)Sb2S3 as the absorber,low-temperature solution-processed tin oxide(SnO2)as the electron conductor.A non-stoichiometric copper sulfide film was prepared by vacuum-vapor evaporation method.By cooprating with conventional Spiro-OMeTAD as the hole transporting layer or buffer layer for perovskite solar cells,perovskite solar cells based on p-type Cu1.75S achieved 18.58%power conversion efficiency,and the device performance remained more than 90%after 1000h storage at 40%humidity.The improvement was attributed to the high mobility,flatness and high hydrophobicity of Cu1.75S.Low-temperature and solution-precessed X1 and small-molecule C3 were designed and synthesized and used as the hole transporting material and cathode interface material respectively in planar p-i-n type perovskite solar cells.X1 improved the open circuit voltage of the device.C3 improved the contact between the PCBM electron transport layer and the cathode,optimized the electron transport performance of the device,and reduced the hysteresis effect of the device.The photoelectric conversion efficiency of the device based on the novel material can reaches 17.42%,and the device has no hysteresis effect.