The Study On Hole Transport Layer Application Of Transition Metal Sulfide For Perovskite Solar Cells

With the increasing demand for energy and worsening environmental problems,how to use solar energy as a clean renewable energy source has become a global research topic.Photovoltaic technology provides a renewable and environmentally friendly energy source that converts solar energy directly into electricity.In recent years,perovskite solar cells originated from dye-sensitized solar cells have developed rapidly in a very short period of time and have received great attention.At present,the research on perovskite solar cells mainly focuses on process optimization and material engineering to obtain efficient and stable solar cells.In this dissertation,the new inorganic transition metal sulfides（TMDs）are introduced into the inverse type planar heterojunction perovskite solar cells.The optimized preparation process of perovskite solar cells is investigated at first,then the preparation method of TMDs and its effects on the performance of perovskite solar cells are studied in detail.The dissertation is organized as follows:（1）Study on the preparation process of perovskite solar cells.The influence of annealing temperature and anti-solvent on the microstructure of the perovskite films and the performance of the solar cells were analyzed comprehensively.Perovskite films with good morphology and crystallinity can be obtained by adjusting the annealing temperatures and anti-solvent dropping time.It is found that the preferred annealing temperature is 100℃and the preferred anti-solvent dropping time is 15s.Using the preferred process parameters,the perovskite solar cell with a photoelectric conversion efficiency of 12.77%was achieved.The preparation process of the perovskite solar cell suitable for the reverse planar structure is establish based on the above preferred process parameters.（2）Study on the preparation of MoS₂,WS₂ hole transport layer and application research of perovskite solar cells.MoS₂ and WS₂ films were prepared by vacuum evaporation.High-quality two-dimensional layered structures MoS₂ and WS₂ were successfully prepared by liquid phase stripping method.Then,two-dimensional layered structure MoS₂ and WS₂ films were prepared by solution spin-coating method,and the photoelectric conversion efficiencies of 7.6%and 6.3%were obtained respectively.The surface morphology,crystallinity and photoelectric properties of different structures of MoS₂ and WS₂ on the active layer of perovskite and the influence on the performance of the cells were analyzed.（3）Interfacial modification of two-dimensional layered MoS₂ film and its application in perovskite solar cells.The two-dimensional layered MoS₂ film prepared by solution spin-coating was subjected to interface modification by ultraviolet ozone treatment.The results show that UV ozone treatment can improve the work function of MoS₂,make the energy level of MoS₂ more compatible with the active level of perovskite active layer,enhance its hole extraction performance,and improve the efficiency to 8.3%.Due to the presence of MoS₂ as a hole transporting layer,the perovskite active layer has defects that affect the performance of the device.By adopting the MoS₂/PEDOT:PSS double hole transport layer,the morphology of the active layer was optimized,the carrier recombination loss at the interface was reduced,and the battery performance was greatly improved,and the photoelectric conversion efficiency of 14.93%was obtained.