The ever-increasing demand for flexible electronics calls for the development of low-voltage and high-mobility organic thin-film transistors (OTFTs) that can be integrated into emerging display and labeling technologies. Polymer dielectrics with comprehensive and balanced dielectric properties (i.e., a good balance between their insulating characteristics and compatibility with organic semiconductors) are considered particularly important for this end. Here, we introduce a simple but highly efficient strategy to realize this target by using a new type of copolymer as dielectrics. Benefiting from both high chain packing density guaranteeing dielectric properties and surface polarity optimizing molecular packing of organic semiconductors, this rationally designed copolymer dielectric endows flexible OTFTs with high mobility (5.6 cm2 V−1 s−1), low operating voltage (3 V) and outstanding stability. Further, their applicability in integrated circuits is verified. The excellent device performance shows exciting prospects of this molecular-scale engineered copolymer for the realization of plastic high-performance integrated electronics.
In an underwater imaging system, a refractive interface is introduced when a camera looks into the water-based environment, resulting in the usually linear rays of light bending and the commonly used pinhole camera model to be invalid. In this paper, a novel method to model and calibrate the underwater stereo system is proposed. Unlike most existing recent works that use vector operations to express light propagation, this paper remodels the underwater imaging system in the view of the light field, which is more organized and concise. Additionally, a forward projection error function, which is more accurate and efficient, is used for non-linear optimization to minimize the reprojection error. The proposed method allows improved accuracy compared with other methods and is evaluated in a set of experiments.
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