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Solution-processed organic photodetectors (OPDs) simultaneously integrating high sensitivity, ultrafast response and broadband detection have rarely been achieved so far. Herein, we demonstrate OPDs based on a semi-tandem structure with remarkable performance by solution-processability. The semi-tandem structure directly superimposes two active layers with complementary absorption spectra, achieving a broad spectral response of 300-1000 nm. It provides a detection covering from ultraviolet to near-infrared range, while the external quantum efficiency in the spectral range of 550-950 nm retains 70%. The high electron and hole injection barriers enable a dark current density as low as 6.51 × 10-5 mA cm-2 at -0.1 V, resulting in a noise current of 3.91 × 10-13 A Hz-1/2 at 70 Hz, which is nearly three times lower than single-junction photodetectors. Encouragingly, the device response speed is improved by suppressing the resistance-capacitance time constant of the device employing semi-tandem structure induced capacitance decreasing. The state-of-the-art OPDs contribute to the response time of 26.27 ns, which is the fastest one in OPDs to the best of our knowledge. We believe that the semi-tandem structures provide a new approach to achieving high-performance photodetectors integrating fast, sensitive and broadband response.Incorporation of heteroatoms and defects in carbonaceous material is well-known approach to improve the electrochemical performance of anode in sodium ion battery (NIB). However, previous works aim either towards heteroatom doped or defect enriched carbon material. Present work is focused on nitrogen-doped, defect induced surface modified carbon nanotubes (MN-BCNT) having synergy of both the effects to improve the electrochemical performance of NIB. Initially, in-situ nitrogen doped carbon nanotubes were grown using scalable, cost-effective and green synthesis technique. In-situ nitrogen doping introduces lattice defects resulting in bamboo shaped carbon nanotubes. Defects were further enriched by opening the ends of tubes and also by length shortening. This structure demonstrates the high capacity of 278 mA h g-1 at a current density of 50 mA g-1, which is more than two times as compared to conventional carbon nanotubes. The improved performance of MN-BCNT is attributed to the improved electrical conductivity due to nitrogen doping and availability of significant active sites owing to length shortening. Moreover, the designed structure shows the good cyclic stability at 200 mA g-1 accompanied with excellent rate capability. © 2020 IOP Publishing Ltd.Adhesion is a major factor in film failure. Based on the basic theory of interfacial toughness, the relationship between film thickness and internal stress and adhesion is qualitatively analyzed. The adhesive properties of silicon nitride deposited on stainless steel substrate by plasma enhanced chemical vapor deposition methods is discussed. The case where nickel, nickel-chromium and alumina films are respectively used as transition layers is compared. After vacuum annealing thermal treatment of these films, the results show that the alumina film has better matching performance with 304 stainless steel, and the interface toughness is improved by 51.2% compared with the silicon nitride film. After the samples are stretched, the silicon nitride film show a large number of cracks when the transition layer is nickel or nickel-chromium, possibly due to the large thermal stress in the film. GA-017 At the same time, the process parameters of magnetron sputtered alumina are optimized, and the optimal deposition rate of alumina film is determined to be 40.25 nm min-1. Then, the effect of film thickness on adhesion is investigated by theoretical analysis and tape breakage test. As the film thickness ratio of alumina and silicon nitride increases, the adhesion is optimal.Wurtzite CdTe and (Cd,Mn)Te nanowires embedded in (Cd,Mg)Te shells are grown by employing vapour-liquid-solid growth mechanism in a system for molecular beam epitaxy. A combined study involving cathodoluminescence, transmission electron microscopy and micro-photoluminescence is used to correlate optical and structural properties in these structures. Typical features of excitonic emission from individual wurtzite nanowires are highlighted including the emission energy of 1.65 eV, polarization properties and the appearance B-exciton related emission at high excitation densities. Angle dependent magneto-optical study performed on individual (Cd,Mn)Te nanowires reveals heavy-hole-like character of A-excitons typical for wurtzite structure and allows to determine the crystal field splitting, ΔCR. The impact of the strain originating from the lattice mismatched shell is discussed and supported by theoretical calculations.The magnetic moment dynamics excited by 35 fs laser pulses in TbCo2/FeCo heterostructure is experimentally investigated by pump-probe technique. The studies are carried out in two typical geometries with magnetizing field perpendicular and along to the easy magnetization axis. In the 'easy axis' orientation, high-frequency oscillations of magnetic moments odd with respect to the sign of the magnetizing field are observed using the magneto-optical Kerr effect. In the perpendicular 'hard axis' orientation corresponding to the spin reorientation phase, the experiment shows oscillations that are even with respect to the field. The maximum angle of Kerr rotation as a function of the magnetizing field strength depicts a specific hysteretic loop that reveals ultrafast optical control of uniaxial magnetic anisotropy originally induced during deposition of the heterostructure in a DC magnetic field. The results provide new ways of ultrafast control of magnetic states in exchange coupled intermetallic heterostructures designed for spintronic applications.Organic light-emitting diodes (OLEDs) have attracted increasing attention due to their superiority as high quality displays and energy-saving lighting. However, improving the efficiency of solution-processed devices especially based on blue emitter remains a challenge. Excitation of surface plasmons on metallic nanoparticles has potential for increasing the absorption and emission from optoelectronic devices. We demonstrate here that the incorporation of gold nano particles (GNPs) in the hole injection layer of poly(3,4-ethylene dioxythiophene)polystyrene sulfonic acid with an appropriate size and doping concentration can greatly enhance the efficiency OLED device especially at higher voltage. Apparently, the spectral of the multiple plasmon resonances of the GNPs and the luminescence of the emitting materials significantly overlap with each other. At 1000 cd/m2 for example, the power efficiency of a studied green device is increased from 29.0 to 36.2 lm/W1, an increment of 24.8%, and the maximum brightness improved from 21,550 to 27,810 cd/m2, an increment of 29.