Hematite electron transporting layer based planar perovskite cells were developed with reduced hysteresis and good stability in ambient air.

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A novel planar terahertz (THz) plasmonic waveguide developed from coplanar stripline (CPS) is proposed for the first time to achieve strongly confined THz propagation performance based on the concept of spoof surface plasmon polaritons (SSPP). Guided-wave characteristics of the proposed plasmonic waveguide are theoretically investigated by eigen-mode simulation technique and finite-difference time-domain solutions. It is found that the waveguide propagation characteristics can be directly manipulated by designing the SSPP unit cells, which exhibit flexible tuning ability of the asymptotic frequency and strong THz field confinement. The idea has been validated through fabricated filter experiments in microwave frequency regime by scaling up the geometry size of the proposed structure. The measured results illustrate high performance of the ultra-wideband filter, in which the reflection coefficient is better than -10 dB from 3 to 13.1 GHz with the smallest and worst insertion losses of 2.2 dB and 5.6 dB, respectively. This work presents a new SSPP waveguide developed from CPS to realize the THz-wave propagation with strong field confinement, which may have promising potential applications in various integrated THz plasmonic devices.

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We have fabricated flexible amorphous Indium-Gallium-Zinc-oxide (IGZO) thin-film transistors (TFTs) with back-channel-etch structure by a chemical vapor deposition-free process. All the processes are performed well below 160°C on a polyethylene napthalate (PEN) substrate with anodic aluminum oxide as gate dielectric, which can be highly immune to the strain failure. The IGZO-TFTs show field-effect mobility of 11.2 cm2/V s, subthreshold swing (SS) of 0.27 V/decade, low off-state current ∼10 fA, low leakage current <1 pA and high ION/IOFF ratio of 109. Meanwhile, the performance of flexible IGZO-TFTs do not deteriorate during the bending with the curvature radius as 10 mm. Using a PEN as substrate, flexible active-matrix organic light-emitting diode (AMOLED) displays driven by the IGZO-TFTs have been demonstrated.