HgCdTe多层异质结技术是未来主流红外探测器发展的重要技术方向,在高工作温度、双/多色和雪崩光电管等高性能红外探测器中扮演着重要的角色。近年来基于多层异质结构的Hg Cd Te高工作温度红外探测器得到了快速发展,尤其是以势垒阻挡型...HgCdTe多层异质结技术是未来主流红外探测器发展的重要技术方向,在高工作温度、双/多色和雪崩光电管等高性能红外探测器中扮演着重要的角色。近年来基于多层异质结构的Hg Cd Te高工作温度红外探测器得到了快速发展,尤其是以势垒阻挡型和非平衡工作P~+-π(ν)-N~+结构为主的器件受到了广泛的研究。本文系统介绍了势垒阻挡型和非平衡工作P~+-π(ν)-N~+结构HgCdTe红外探测器的暗电流抑制机理,分析了制约两种器件结构发展的关键问题,并对国内外的研究进展进行了综述。对多层异质结构Hg CdTe红外探测器的发展进行了总结与展望。展开更多
TiBN coatings have huge potential applications as they have excellent properties with increasing modem industrial requirements.Nanocomposite TiBN coatings were synthesized on cemented carbide,high speed steel and Si s...TiBN coatings have huge potential applications as they have excellent properties with increasing modem industrial requirements.Nanocomposite TiBN coatings were synthesized on cemented carbide,high speed steel and Si substrates by using cathodic arc plasma ion plating from pure TiB2 ceramic targets.The structure and mechanical properties of the TiBN coatings were significantly influenced by the nitrogen partial pressure.Rutherford backscattering spectrometry demonstrates that the nitrogen content of the coating varied from 2.8% to 34.5% and highresolution electron microscopy images reveal that all coatings have the characteristic of nanocrystals embedded in an amorphous matrix.The root-mean-square roughness of the coatings increases from 3.73 to 14.64 nm and the coefficients of friction of the coatings at room temperature vary from 0.54 to 0.73 with increasing nitrogen partial pressure.The microhardness of the coating increases up to 35.7 GPa at 10 sccm N2 flow rate.The smallest wear rate is 2.65 ×10^-15m^3N^-1m^-1 which indicates that TiBN coatings have excellent wear resistance.The adhesion test revealed that the TiBN coatings have good adhesion at low nitrogen partial pressure.展开更多
We fabricated a silver ion emitter based on the solid state electrolyte film of RbAg4 I5 prepared by pulsed laser deposition. The RbAg4 I5 target for PLD process was mechano-chemically synthesized by high-energy ball ...We fabricated a silver ion emitter based on the solid state electrolyte film of RbAg4 I5 prepared by pulsed laser deposition. The RbAg4 I5 target for PLD process was mechano-chemically synthesized by high-energy ball milling in Ar atmosphere using β-AgI and RbI as raw materials. The ion-conducting properties of RbAg4 I5 were studied by alternating current(AC) impedance spectroscopy and the ionic conductivity at room temperature was estimated 0.21 S/m. The structure, morphology, and elemental composition of the RbAg4 I5 film were investigated. The Ag+ ion-conducting property of the prepared superioni-conductor film was exploited for ion–beam generation. The temperature and accelerating voltage dependences of the ion current were studied. Few nA current was obtained at the temperature of 196?C and the accelerating voltage of 10 kV.展开更多
Copper ion conducting solid electrolyte Rb_(4)Cu_(16)I_(6.5)Cl_(13.5)was prepared by means of mechano-chemical method.The structure and morphology of the powder was investigated by x-ray diffraction and scanning elect...Copper ion conducting solid electrolyte Rb_(4)Cu_(16)I_(6.5)Cl_(13.5)was prepared by means of mechano-chemical method.The structure and morphology of the powder was investigated by x-ray diffraction and scanning electron microscopy.The grain size was estimated to be 0.2-0.9μm and the ionic conductivity at room temperature was approximately 0.206 S/cm.The solid electrolyte Rb_(4)Cu_(16)I_(6.5)Cl_(13.5)was exploited for copper ion beam generation.The copper ion emission current of several nA was successfully obtained at acceleration voltages of 15 kV and temperature of 197℃in vacuum of 2.1×10^(-4)Pa.A good linear correlation between the logarithmic ion current(logI)and the square root of the acceleration voltage(U_(acc))at high voltage range was obtained,suggesting the Schottky emission mechanism in the process of copper ion beam generation.展开更多
文摘HgCdTe多层异质结技术是未来主流红外探测器发展的重要技术方向,在高工作温度、双/多色和雪崩光电管等高性能红外探测器中扮演着重要的角色。近年来基于多层异质结构的Hg Cd Te高工作温度红外探测器得到了快速发展,尤其是以势垒阻挡型和非平衡工作P~+-π(ν)-N~+结构为主的器件受到了广泛的研究。本文系统介绍了势垒阻挡型和非平衡工作P~+-π(ν)-N~+结构HgCdTe红外探测器的暗电流抑制机理,分析了制约两种器件结构发展的关键问题,并对国内外的研究进展进行了综述。对多层异质结构Hg CdTe红外探测器的发展进行了总结与展望。
基金supported by National Natural Science Foundation of China under grant 11375135International Cooperation Program of the Ministry of Science and Technology under grant 2015DFR00720
文摘TiBN coatings have huge potential applications as they have excellent properties with increasing modem industrial requirements.Nanocomposite TiBN coatings were synthesized on cemented carbide,high speed steel and Si substrates by using cathodic arc plasma ion plating from pure TiB2 ceramic targets.The structure and mechanical properties of the TiBN coatings were significantly influenced by the nitrogen partial pressure.Rutherford backscattering spectrometry demonstrates that the nitrogen content of the coating varied from 2.8% to 34.5% and highresolution electron microscopy images reveal that all coatings have the characteristic of nanocrystals embedded in an amorphous matrix.The root-mean-square roughness of the coatings increases from 3.73 to 14.64 nm and the coefficients of friction of the coatings at room temperature vary from 0.54 to 0.73 with increasing nitrogen partial pressure.The microhardness of the coating increases up to 35.7 GPa at 10 sccm N2 flow rate.The smallest wear rate is 2.65 ×10^-15m^3N^-1m^-1 which indicates that TiBN coatings have excellent wear resistance.The adhesion test revealed that the TiBN coatings have good adhesion at low nitrogen partial pressure.
基金Project supported by the National Natural Science Foundation of China(Grant No.11875210)China Postdoctoral Science Foundation(Grant No.2018M640724)+1 种基金the International Cooperation Program of Guangdong Provincial Science and Technology Plan Project(Grant No.2018A050506082)the Talent Project of Lingnan Normal University,China(Grant No.ZL1931)
文摘We fabricated a silver ion emitter based on the solid state electrolyte film of RbAg4 I5 prepared by pulsed laser deposition. The RbAg4 I5 target for PLD process was mechano-chemically synthesized by high-energy ball milling in Ar atmosphere using β-AgI and RbI as raw materials. The ion-conducting properties of RbAg4 I5 were studied by alternating current(AC) impedance spectroscopy and the ionic conductivity at room temperature was estimated 0.21 S/m. The structure, morphology, and elemental composition of the RbAg4 I5 film were investigated. The Ag+ ion-conducting property of the prepared superioni-conductor film was exploited for ion–beam generation. The temperature and accelerating voltage dependences of the ion current were studied. Few nA current was obtained at the temperature of 196?C and the accelerating voltage of 10 kV.
基金supported by Shenzhen Municipal Science and Technology Innovation Commission(Grant Nos.JCYJ20170818112901473 and GJHZ20200731095604015)the Department of Science and Technology of Guangdong Province,China(Grant Nos.2020A0505100059,2020A1515011531,and 2020A1515011451)by the Ministry of Education and Science of the Russian Federation in the frame of the state assignment(Grant No.FSSN-2020-0003)。
文摘Copper ion conducting solid electrolyte Rb_(4)Cu_(16)I_(6.5)Cl_(13.5)was prepared by means of mechano-chemical method.The structure and morphology of the powder was investigated by x-ray diffraction and scanning electron microscopy.The grain size was estimated to be 0.2-0.9μm and the ionic conductivity at room temperature was approximately 0.206 S/cm.The solid electrolyte Rb_(4)Cu_(16)I_(6.5)Cl_(13.5)was exploited for copper ion beam generation.The copper ion emission current of several nA was successfully obtained at acceleration voltages of 15 kV and temperature of 197℃in vacuum of 2.1×10^(-4)Pa.A good linear correlation between the logarithmic ion current(logI)and the square root of the acceleration voltage(U_(acc))at high voltage range was obtained,suggesting the Schottky emission mechanism in the process of copper ion beam generation.
