Preparation Of Indium Tin Oxide Nanocrystals And Potassium Doped Caesium Lead Bromide Perovskite And Their Properties

Doped metal oxides with excellent optoelectronic properties showed great promise in a wide range of potential applications such as future photonic integrated circuits,sensors,micro-optical components,medical diagnoses and treatments.As heavily doped n-type semiconductor,indium tin oxide nanoparticles(ITO NPs)have drawn wide interest for their low resistance,high light transmittance and infrared reflectance,good wear proof and chemical erode resistant property,but very few studies have involved applying ITO NPs to lithium ion batteries(LIBs).Transition metal oxides show high theoretical specific capacity,but severe volume expansion caused by lithium ion electrochemical alloying which leads to the loss of large capacity and poor cycle performance.Elastic MoS2 nanosheets serve as an ideal substrate material to prevent the particles from aggregation and accommodate the strains during repeated lithation/delithation.Herein,ITO NPs and ITO/MoS2 nanocomposites were prepared by colloidal process and their electrochemical performance was revealed when used as anode material of LIBs.ITO/MoS2 nanocomposite showed better performance than pure ITO NPs.The nanocomposite displayed a high reversible discharge capacity of 496 mAh g-1 and retention rate of 58.2%after 50 cycles at 100 mA g-1.What was more,coulombic efficiency for most of the cycles were larger than 97%,indicating excellent reversibility of the electrode.These results exhibited the importance of attaching ITO NPs to MoS2 nanosheet for maximum utilization of electrochemically activive ITO NPs and well-structured MoS2 for energy storage applications in high-perf-ormance LIBs.In addition,the compelling combination of easy processing of the organic components and superior mechanical,electromagnetic properties and thermal stability of inorganic components make organic-inorganic hybrid perovskite crystals appealing for laser,field effect transistor,solar cell and other applications.In recent years,perovskite halide nanocrystals have been caught extensive concerns due to simple formulation method,high quantum yield(about 80%),narrow emission lines(line width 0.12 eV)and enhanced optical properties.However,this aspect of the research rarely covered doped cesium lead halide perovskite.Based on improved photovoltaic properties of some metal doped CH3NH3PbX3,a series of potassium doped KxCs1-xPbBr3(x=0,0.02,0.04,0.06,0.08,0.1)nanocrystals were prepared by colloidal method and their size,morphology and optical properties were investigated.The results showed that the fluorescence emission peak of doped KxCs1-xPbBr3 with cubic structure appeared minor blue shift as the doping concentration increased from x=0 to x=0.1 compared with CsPbBr3.