Preparation And Stability Of Organic-inorganic Hybrid Perovskite Solar Cell Materials

With the depletion of traditional non-renewable energy sources such as petroleum and coal,the“energy crisis”has also been put on the agenda,and the development of clean,renewable and environment-friendly new energy is imminent.This type of new energy mainly includes solar energy,wind energy,ocean energy and biological energy.Among them,solar energy is more clean and pollution-free,with abundant reserves,easy collection,and wide application area.At present,human life is inextricably linked with electric energy,and electric energy transmission is fast and easy to store.Photoelectric conversion is one of the best ways to extract solar energy to obtain electric energy,and experts in the field of photovoltaics have been focusing on research.One of the important devices for realizing the photoelectric conversion is a perovskite solar cell.The light absorption layer of the device is a perovskite layer,and the film quality determines the photovoltaic performance of the solar cell.In this experiment,an organic-inorganic hybrid perovskite material?CH₃NH₃PbI₃?was used as a light absorbing layer.Through X-ray diffraction?XRD?,scanning electron microscopy?SEM?,and Raman characterization,a one-step spin coating process was studied.The best process parameters.It was found that the prepared perovskite film had the best quality when DMF was used as the solvent and the precursor concentration was 0.3 mol/L for 10 min and the annealing temperature was 100°C.In-situ transmission electron microscopy was used to explore the microstructure changes of perovskite solar cell materials in the energized,heated and light irradiated environments.It was found that the morphology and crystal structure of the perovskite of CH₃NH₃PbI₃ changed significantly during energization,heating and light irradiation,and the perovskite material gradually decomposed into PbI₂.Finally,a fully-structured perovskite solar cell is prepared.By testing the photoelectric conversion rate,the effects of differently prepared CH₃NH₃PbI₃ films on the photovoltaic performance of solar cells were investigated.Using the best quality CH₃NH₃PbI₃ perovskite film as the light absorbing layer of the perovskite solar cell,the photoelectric conversion rate of the perovskite solar cell is the highest,reaching7.7%.This study not only provides basic data for the study of the photovoltaic performance of perovskite solar cells,but also provides a theoretical basis for the exploration of perovskite solar cell materials.