In this study, we report solution-processed photodetectors fabricated by methylammonium triiodide perovskite (CH 3 NH 3 PbI 3) incorporated with PbS quantum dots (QDs) through the trapassisted charge-injection effect. In order to increase the photo-responsivity by eliminating the charge injection barrier from the cathode electrode, PbS QDs, which possesses large amount of trap states, are introduced into the CH 3 NH 3 PbI 3 thin film for establishing ohmic contact at the CH 3 NH 3 PbI 3 /aluminum (Al) interface. As a result, an external quantum efficiency of ~4500 %, a photoresponsivity of ~15000 mA/W and a detectivity of over 6×10 13 Jones (1 Jones=1 cmHz 1/2 W-1) at a small bias of 2 volts, and a photoresponse time of 11.5 µs are observed from the solution-processed photodetectors fabricated by the CH 3 NH 3 PbI 3 :PbS QDs nanocomposites thin film.

In this study, we report novel NiSe@MoSe nanosheet arrays prepared by a facile one-step hydrothermal method through nickel (Ni) foam as Ni precursor and the framework of MoSe. Owing to the unique interconnection and hierarchical porous nanosheet array architecture, the NiSe@MoSe nanosheet arrays exhibit a high specific capacitance of 774 F g at the current density of 1 A g, which is almost 2 times higher than that (401 F g) of the NiSe matrix and about 7 times greater than that (113 F g) of the MoSe nanoparticles. Moreover, we report an asymmetric supercapacitor (ASC), which is fabricated by using the NiSe@MoSe nanosheet arrays as the positive electrode and the graphene nanosheets (GNS) as the negative electrode, with aqueous KOH as the electrolyte. The NiSe@MoSe//GNS ASC possesses an output voltage of 1.6 V, an energy density of 25.5 Wh kg at a power density of 420 W kg, and a cycling stability of 88% capacitance retention after 5000 cycles. These results indicate that the NiSe@MoSe nanosheet arrays are a good electrode for supercapacitors.

Supercapacitors have attracted enormous attentions for energy storage in both academic and industrial sectors in the past years. In this study, we report all-solid-state flexible asymmetric supercapacitors (ASCs) without any binder, incorporated with the hydrophilic carbon cloth (HCC) with MnO 2 nanocomposite (HCC@MnO 2 ) as the positive electrode, the HCC with polypyrrole (PPy) (HCC@PPy) as the negative electrode, and polyvinyl alcohol (PVA)-LiCl gel as both gel electrolyte and separator. The HCC@MnO 2 and HCC@PPy electrodes are prepared by direct deposition of either MnO 2 nanoparticles or PPy nano-films on the HCC through a simple, facile and controllable electrochemical deposition method, respectively.The HCC@MnO 2 and HCC@PPy electrodes provide rich contact area for gel electrolyte, This article is protected by copyright. All rights reserved. 2facilitating the rapid delivery of electrolyte ions, and also minimize the resistance of ASCs.As a result, all-solid-state flexible binder-free HCC@MnO 2 //HCC@PPy ASCs exhibit a large operating voltage of 1.8 V, high energy density of 28.2 Wh kg -1 at the power density of 420.5 W kg -1 and excellent cycling stability (91.2% capacitance retention after 5000 cycles). Our studies provide a facile, scalable and efficient approach to fabricate all-solid-state ASCs with high electrochemical storage performance for flexible electronics.