According to the characteristics of rotary direct drive electro-hydraulic pressure servo valve, the lumped parameter modeling and three-dimensional (3D) field analysis methods are integrated. The lumped parameter method is used for mathematical modeling for system parts with clear physical concept, and for complicate structures difficult to simply and derive, the 3D mathematical model is employed to analyze the magnetic field, flow field and structural field. Moreover, numerical fitting is carried out to the field analysis results, and the model recognition methods, such as neural network, are used for modeling. Specific mathematical algorithms are used to represent the mathematical relationship between the input parameters (such as structural parameters and environmental parameters) and the feature output parameters. Finally, the algorithm which can be used to evaluate the relationship between the input parameters (such as structural parameters and environmental parameters) of the analyzed object and its static and dynamic performances is obtained. For similar research objects, the user only needs to change the values of input parameters to complete the analysis and evaluation of the static and dynamic performances of system.
This study investigates the potential of inorganic perovskite CsPbBr3 as a photovoltaic material, highlighting its superior stability compared to that of organic–inorganic hybrid perovskite materials. Conventional methods for preparing CsPbBr3 perovskite films, such as the two-step method and the dual-source thermal evaporation method, face challenges in obtaining high-purity films due to the decomposition of precursor films and the formation of multiple heterogeneous phases. To address this issue, we synthesized CsPbBr3 powder material using thermal evaporation deposition, which effectively suppressed decomposition and the formation of heterogeneous phases. Consequently, we achieved uniform and dense CsPbBr3 perovskite films. By incorporating energy-band engineering modification with CsPbBr3 quantum dots (QDs), the all-inorganic perovskite solar cells (PSCs) attained a power conversion efficiency (PCE) of 7.01% under standard solar illumination conditions. The device PCE remained at 93% of its initial efficiency under 30% relative humidity conditions for over 100 days, showcasing its durability. The developed method produced an average grain size of 800 nm, resulting in a smooth and uniform film surface, thereby demonstrating the method’s high repeatability. Additionally, the optimized PSCs exhibited a high open-circuit voltage (VOC) with the champion device reaching a VOC of 1.38 V and a PCE of 7.01%. This research presents a robust, efficient, and cost-effective approach for fabricating high-quality all-inorganic PSCs.
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