| Summary: | 碩士 === 輔仁大學 === 化學系 === 107 === To meet the future challenge of energy requirement, photovoltaic device is one of the important renewable power sources. Dye-sensitized solar cells (DSSCs) and perovskite solar cells (PSCs) are emerging cost-effective photovoltaic technologies because of potential low-cost manufacturing processes, and simple device structure. In the development of dye-sensitized solar cells counter electrodes materials, the laboratory has established some foundations, and hopes to continue to develop novel counter electrodes materials and apply our synthesized graphene composite materials to perovskite solar cells. The disadvantages of perovskite solar cells include low stability under high humidity and high temperature, toxicity of lead-containing cations, and long-term stability of device properties. Especially moisture is the most difficult problem to overcome. At present, the organic-inorganic methylammonium lead halide perovskite material easily reacts with water, and changes its crystal structure, resulting in the material being unable to absorb visible light and the device fails. Therefore, in order to accelerate its commercialization, these problems still need to be overcome.
This study mainly introduces graphene oxide into perovskite solar cells as the interface buffer layer between PEDOT:PSS and perovskite layer, optimizes device conditions from adjusting concentration and rotation speed. The best photoelectric characteristics are obtained by repeating the sample, and the power conversion efficiency can reach 15.24%. Using EQE, UV-vis, FE-SEM, and XRD to prove that graphene oxide is used as an interface buffer layer, it can provide an effective medium for hole transmission and collection between PEDOT:PSS and perovskite layer.
In the future, the laboratory will be able to use graphene oxide as the basis of the interface buffer layer, and the graphene/metal composite material synthesized by our laboratory in recent years is introduced into the perovskite solar cell as the interface buffer layer. The layered graphene has the impermeability of moisture and oxygen. Therefore, graphene could improve the barrier property and heat resistance of the perovskite layer, avoiding structural damage caused by reaction with moisture and oxygen. Thus, the approach may achieve the purpose of effectively extending the life of device. Moreover, the graphene/metal composite material itself has high conductivity, matching energy level, and good stability, therefore it might have potentials to optimize the efficiency of the perovskite device.
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