Study On The Preparation And Performance Of The Inorganic Electron Transport Layer Of Perovskite Solar Cells

With the development of society and economy,the demand for energy is more and more big,the fossil energy to the environment pollution is more and more big,but along with the people environmental protection consciousness enhancement,people are more friendly to environment clean energy,solar energy one of choice.At present,the three generations of solar cells has been perovskite solar cell has the process is simple,flexible and wide application prospect,etc,since 2009,its efficiency is increased from 3.8%to more than 22%now,caused the wide attention of researchers.In this paper,TiO₂,ZnO and WOx are studied as the electron transport layer of the perovsktie solar cell.The preparation process of the electron transport layer was investigated and the effects of the preparation of the electron transport layer on the morphology and the performance of the battery were analyzed,and the factors affecting the uniform forming of the perovskite were discussed.The solar cell was built on the basis of different electron transport layer,and its influence on battery performance was discussed（1）Study of the performance of the solar cell based on TiO₂ electron transport layer.The TiO₂ slurry was prepared by sol-gel method,the TiO₂electron transport layer was prepared by the method of TiO₂ electron transport,and a one-step method was used to prepare the CH₃NH₃PbI₃perovskite thin film.And the hole transport layer was spiro-OMeTAD,and evaporated Au was used as counter electrode.Finally got the FTO/TiO₂/CH₃NH₃PbI₃/spiro-OMeTAD/Au the structure of the battery.The effects of electron transport layer morphology and thickness on the efficiency of calcium titanium mine and battery were studied.After optimization,when the surface roughness of electron transport layer is13nm,the thickness is about 60nm,the efficiency reaches 5.57%,Jsc=8.7mA/cm2,Voc=0.96V,FF=66.61.Using SEM,XRD,AFM and UV-vis,the structure and performance of the electron transport layer materials were characterized and tested,and the effect on battery efficiency was discussed.（2）Study of the performance of the solar cell based on WOx electron transport layer.WOx slurry was prepared by sol-gel method,WOx electron transport layer was prepared by spin coating,and CH₃NH₃PbI₃perovskite thin films were prepared by one-step process.And the hole transport layer was spiro-OMeTAD,and evaporated Au was used as counter electrode to assemble FTO/WOx/CH₃NH₃PbI₃/spiro-OMeTAD/Au battery.The effects of the morphology of the electron transport layer on the perovskite layer and the battery performance during the preparation of WOx were investigated.The factors affecting perovskite formation were analyzed from the aspects of solution concentration,roughness and thickness.The optimized perovskite solar cells obtained 8.27%photoelectric conversion efficiency,Jsc was 18.90mA/cm²,Voc was 0.73V,and FF was 59.84.（3）Study of the performance of the solar cell based on ZnO electron transport layer.ZnO pulp was prepared by sol gel method,ZnO thin films were prepared spin-coating,the hydrothermal method were used to grow ZnO nanorods and CH₃NH₃PbI₃ perovskite thin films were prepared by one-step process,spiro-OMeTAD as hole transport layer,steamed Au plating for electrodes,assembly FTO/ZnO/CH₃NH₃PbI₃/spiro-OMeTAD/Au batteries.At the same time,the influence of the concentration of solution and the time of heat preservation on the morphology of the nanometer rods was discussed.The optimum concentration of ZnO precursor is 0.5mol/L by optimization.The effect of the optimized Zinc Oxide film on the performance of the battery is discussed.