In organic electronics, the use of self-assembled monolayer dielectric functional groups is considered an effective surface modification strategy that can significantly improve device performance. A flexible polymer (PEDOT:PSS) photodetector on the substrate polyimide with broadband response (450 nm ∼ 980 nm) and high response (0.56 A W −1 ) is reported, which is superimposed on the surface by small molecule (C 60 ) thermal evaporation. In addition, the planeness of the organic semiconductor and the overall performance of the organic thin film photodetector can be improved significantly by using a small molecule modified polymer thin film ; the photocurrent, R i and external quantum efficiency were all increased by more than 10%. The response time of the device reached an astonishing 5.87 ms, much faster than that of similar devices. The response of the small molecule modified organic device is improved by an order of magnitude, which provides a guarantee for better application of organic thin films in circuits. Moreover, the device has a strong flexible stability performance, which can meet the requirements of flexible stability for future photoelectric devices.

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Purpose Maintenance stands are the most valuable maintenance resources and provide the necessary maintenance space and maintenance facilities for aircraft maintenance. To expand the maintenance market, maintenance, repair and overhaul (MRO) urgently need to achieve a reasonable schedule between aircraft maintenance requirements and maintenance stand capability to improve aircraft maintenance continuity and reduce the risk of scratching due to aircraft movement. This study aims to design a maintenance stand scheduling (MSS) model based on spatiotemporal constraints to solve the problem of maintenance stand schedules. Design/methodology/approach To address the problem of maintenance stand schedules, this study introduces mixed-integer programming algorithm to design the MSS model on the basis of classical hybrid flow shop structure. When designing the optimization objective function of MSS modeling, the spatiotemporal constraints are mainly considered. Specifically, first, the spatial constraints between maintenance stands are fully considered so that more aircraft can be parked in the workshop. Second, the optimization objective is designed to minimize the number of aircraft movements by defining multiple maintenance capabilities of the stand. Finally, a solution based on spatiotemporal constraints is proposed in the solving process. Findings A set of MRO production data from Guangzhou is used as a test data set to demonstrate the effectiveness of the proposed MSS model. Originality/value The types of maintenance stands are defined and divided into four categories: fixed stand, temporary stand, half-body stand and engine ground test stand, which facilitates optimal modeling; a new scheduling model is designed considering both temporal constraints and spatial constraints, which can improve both the utilization of maintenance stand and safety (reduce the risk of scratching between aircraft).