Materials Literature
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The intrinsic silicon thin film for passivation of the crystalline silicon wafer surfaces in silicon heterojunction cells was prepared by very high fregucency plasma enhanced CVD (VHF-PECVD). Plasma emission versus time was recorded by optical emission spectroscopy (OES) during the silicon thin film deposition. Result…
A molecular dynamics simulation study is performed on the effect of the thermal history of initial melt temperature on the microstructure evolution in solidification process of liquid metal Ni by means of quantum Sutton-Chen n-body potential. The pair distribution function g(r) curves, the bond-type index method, the…
The formation energies and ionization energies of Ag-N dual-doped ZnO and interstitial N and H monodoped ZnO:(Ag,N) are investigated from the firstprinciples pseudo-potential approach based on density functional theory. It is found that AgZn-NO accepter pair has lower formation energy and ionization energy than Ag-N r…
The electron transport properties of the system consisting of the zigzag graphene nanoflake doped with nitrogen and boron atoms connected to two Au electrodes through S-Au bonds are investigated theoretically. The results show that a nanoflake doped with nitrogen and boron atoms at edges has poor rectifying performanc…
The amorphous silicon TFT (α-Si thin film transistor) were fabricated in a new structure, in which the ohmic contact layer (n+ layer) and the nitride silicon insulating layer for grid (G-SiNx) were stratified. Various factors which affect the electron mobility of α-Si TFT are studied using orthogonal test. With the in…
采用分子束外延技术对δ掺杂GaAs/AlxGa1-xAs二维电子气(2DEG)样品进行了生长. 在样品生长过程中, 分别改变掺杂浓度(Nd)、空间隔离层厚度(Wd) 和AlxGa1-xAs中Al组分(xAl)的大小, 并在双温(300 K, 78 K)条件下对生长的样品进行了霍尔测量; 结合测试结果, 分别对Nd, Wd及xAl与GaAs/AlxGa1-xAs 2DEG的载流子浓度和迁移率之间的关系规律进行了细致的分析讨论. 生长了包含有低密度InAs量子点层的δ掺杂GaAs/AlxGa1-xAs 2DEG 样品, 采用梯度生长法得到了不同密度的InAs量子点. 霍尔测量结果表明, 随着InAs量子点密度的增加, GaAs/Alx…
MCNP program is used to calculate the neutron transmission coefficient of 3–9 cm-thick neutron absorber material B4C/Al composite with 5%–15% B4C content in air, water, 200–1400 ppm (1 ppm=10-6) H3BO3 solution, irradiated by 0.5–20 MeV neutrons and 235U thermal neutron fission source. The results show that the transmi…
The molecular dynamics simulations are performed with single-crystal copper thin films under cyclic loading to investigate temperature effects on the mechanical responses. First, the method to determine the number of cycles to failure is reported: the total energy-the number of cycles curve and the stress-the number o…
The thickness of an active layer is limited by its low mobility of carriers in a polymer solar cell composed of the blend bulk-heterojunction formed by P3HT as donor material and PCBM as acceptor material, which can affect the light absorption of the polymer solar cell. Metal nanocrystals-doped polymer active layer ca…
We have changed the resonance energy of the graphene oxide molecular clusters by using the external electric field. From the graphene oxide resonance fluorescence we could study the polarization dynamics of graphene oxide under the electric field. It is found that the electric field makes the FWHM of fluorescence reso…
The machined workpiece has high mechanical storage energy because of the defect structures formed in nanocutting and their evolution from high energy state to the low energy state by adjusting atom positions automatically is called surface-energy aging. The effect of surface-energy aging on the surface properties of m…
Eu2+/Ce3+ single doped and co-doped oxide glasses with high Gd2O3 concentration were prepared in a reducing atmosphere using a high-temperature glass melting method. Excitation and emission spectra measurements indicated that Ce3+ can enhance the luminescence intensity of Eu2+ effectively, which exhibited a 2.3 times…
As one of the most important ignition capsules, the polyimide capsule was prepared by depolymerizable mandrels technique combined with vapor deposition polymerization method. Instead of the plane pan and piezoelectric vibration model, the mesh pan and pulse tapping was selected to reduce microsphere collision so that…
We experimentally achieved optical third harmonic generation (THG) from two-dimensional periodically arrayed gold-island films. The gold-island films were fabricated using micro-spherical lithography. By using a reflection-type optical system, these arrays can produce significant THG with the help of a spectrum-resolv…
The characteristic properties including equilibrium lattice constants, elastic constants, cohesive energies and alloy formation energies, of stoichiometric L12 type NiAl3, L12 type Ni3Al, L10 type NiAl and B2 type NiAl, are calculated using a constructed n-body potential model combined with molecular dynamics. Further…
W(Mo, 9.8 at.%)/Cu nanometer multilayer films of different individual layer thickness were prepared by RF magnetron sputtering, which were irradiated by 60 keV He+ ions at ion fluence from 0 to 51017 He+/cm2. Microstructures of nanometer multilayer W(Mo)/Cu films were investigated by high-resolution transmission elect…
The objectives of this research were to analyze the physical and mechanical properties of con block and paving block composites made from rice husk. Cement and aggregate ratio for con block and paving block were set at 1:6, 1:8, 1:10, and 1:4, 1:6, respectively. The content of rice husk ash in aggregate was varied fro…
The influences of oxygen ion dose and annealing temperature on the microstructural and photoelectrical properties of microcrystalline diamond films with Si-V luminescence centers were systematically investigated. Results show that high temperature annealing prefers to increase the Si-V luminescence intensity in oxygen…
Proteins are a fascinating class of macromolecules from both functional and structural perspectives. They catalyze the reactions that sustain life, bind ligands with high affinity and specificity, and mediate interactions among biomolecules in complex cellular milieux. Proteins also assemble into higher-order structur…
In this paper, we present the design, simulation, and experimental demonstration of a miniaturized low-frequency metamaterial absorber based on the broadside-coupled spiral structures. The tested results indicate that the metamaterial absorber can achieve a miniaturized narrowband absorption with a peak absorption of…