Advanced Materials Research Vol. 1094

Abstract: This paper discusses the particles irradiation effect of solar cells, particles irradiation damage mechanism of the solar cell are summarized. Through in-depth analysis and summary of predecessors' research results, proposed a variety of means such as electron irradiation, cobalt 60 irradiation and proton irradiation research the irradiation damage effect of polysilicon batteries. Through comparative analysis for rules, and for new materials research of the battery, improving preparation technology of the solar cell and monitoring the production process providing some reference of improving the radiation resistance and electrical performance of the battery.

Abstract: We investigate the effects of polytetrafluoroethylene (PTFE) on organic photovoltaic (OPV) devices with structure of ITO/PTFE/PEDOT:PSS/P3HT:PCBM/PTFE/Al by inserting thermally evaporated PTFE films between indium-tin-oxide (ITO) and PEDOT:PSS layers, and also between P3HT:PCBM and Al, respectively. Significant improvement in terms of open-circuit voltage, Fill factor (FF), and thereby in its commensurate power conversion efficiency is achieved compared to devices with PEDOT:PSS and LiF buffer layers. The OPVs performance enhancement is attributed to the formation of an artificial dipole layer resulting from the rich, negatively charged fluorine that facilitates the charge extraction process.

Abstract: Safety is the key-feature of high energy density lithium-ion batteries and thermal stability of the electrolytes is crucial. In this work, the thermal and flammability properties of mixed electrolytes based on the conventional ethylene carbonate (EC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC) (1:1:1 v/v/v), 1M LiPF₆ and the hydrophobic ionic liquid (IL) N-methyl-N-propylpiperidinium bis (trifluoromethanesulfonyl) imide (Pp13TFSI) have been investigated. The mixed electrolyte is observed to be nonflammable at the Pp13TFSI contents of more than 40 vol.%. And physical and electrochemical characteristics of high energy density lithium ion batteries based on Li [Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ as the cathode and artificial graphite as the anode with mixed electrolyte are also investigated. The cell of graphite/ Li [Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ with 1 mol/L LiPF6/40%Pp13TFSI + 60% (EC+DMC+EMC) (1/1/1,v/v/v) electrolyte shows first charge capacity of 313.8 mAh g-1 and discharge capacity of 201.8 mAh g-1, respectively. Moreover, the nail penetration tests are carried out on the charged lithium-ion cells after formation, and the results show no explosion, ignition, or thermal runaway. These results suggest that the IL has potential to improve the safety of lithium ion batteries and can be used to fabricate the high energy density lithium ion batteries for electric vehicles and hybrid electric vehicles.

Abstract: We investigate the effects of Au nanoparticles (Au NPs) on poly [N-9′′-hepta-decanyl-2,14-carbazole-alt-5,5-(4′,14′-di-2-thienyl-2′,1,3′-benzothiadiazole)]:ph-enyl-C61-butyric acid methyl ester (PCDTBT:PCBM) based organic photovoltaic (OPV) devices by thermal evaporating Au NPs onto polytetrafluoroethylene (PTFE) layer which is based on indium-tin-oxide (ITO) glass substrate.Significant improvement in terms of short-circuit current density (Jsc) by 33.6%, fill factor (FF) by 0.9%, and thereby commensurate power conversion efficiency (PCE) by 40.7% were achieved compared to devices without Au NPs. The OPVs performance enhancement is attributed to the formation of Au NPs-induced surface plasmons that increases the rate of exciton generation, and the probability of exciton dissociation.

Abstract: Since the rare earth based compounds have shown excellent properties such as luminescence and photo-electric transformation effect due to their 4f electronic structures. A novel Sm-doped CuIn_1-xSm_xTe₂ semiconducting compounds have been designed and their crystal structures, microstructures and optical properties have been investigated using X-ray diffraction(XRD), scan electron microscopy (SEM), ultraviolet and visible spectrophotometer and Raman scattering. The results reveal that the doping of samarium into CuInTe₂ (CIT) could stabilize the chalcopyrite structure, the lattice parameters shows fluctuation phenomenon with doping Sm in CIT. The SEM morphologies show that the grains tend to be agglomeration and form the column-like or the flake-like single crystals. The band gap Eg are corresponding to 1.25eV and 1.32eV before and after doping Sm with 0.1 mole into CuInTe₂. Raman scattering analysis proves that Sm significantly adjusts the atomic vibrating models, and result in the losses of some vibrating peaks. It reveals that doping of Sm into CuInTe₂ is helpful for the absorption of spectra with special frequencies.

Abstract: A facile synthesis method of three dimensional reduced graphene oxide (RGO)/multiwalled carbon nanotubes (MWCNTs) hydrogel was introduced. Hydrogel samples which were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM) and examined by X-ray diffraction (XRD) have been used as the electrode of supercapacitor. Cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) were used to investigate the Supercapacitors which we have fabricated. Because MWCNTs inserting into layers of RGO homogeneously prevent the layers of RGO from stacking and enlarge the specific surface area of graphene, the specific capacitance of RGO/MWCNTs material has been greatly improved. At the current density of 0.2A/g, the specific capacitance of RGO/MWCNTs electrode is about 176F/g, which means a 52% increasement compared to which of pure RGO material electrode. And the specific capacitance of RGO/MWCNTs also achieves a good rate property.

Abstract: nanosized Sn-Ge/C composite powders were successfully prepared by rocking vibratory ball milling method, and characterized with X-ray powder diffraction and laser particle size analysis method. The electrochemical performance of the nanocomposite anodes was investigated by charge-discharge tests. The results show that Ge exhibits as the elemental form in the nanocomposites. The capacity of nanocomposite anodes can be enhanced by the introduction of micro-sized Ge powders. The Sn₉₀Ge₁₀/C nanocomposite anodes deliver the optimum electrochemical performance, including discharge capacity and cycling stability. However, the relatively fast capacity fade of the nanocompsoite anodes need to be further improved.

Abstract: The Zn/N co-doped composite thin films were deposited on medical glass slide by synthesis technique of arc ion plating and magnetron sputtering. The influence of N doping amount, annealing treatment on films properties were investigated. Film structure, surface morphologies and optical properties were measured with XRD, SEM and UV-VIS transmittance spectroscope. The results show that the absorption edges of the composite films increasing with the rising N doping amount. The greatest absorption edges of the composite films can reach 550nm, but the transmittance decreasing with the N doping amount increasing obviously. The absorption edge of the films decreased in different degree after annealing treatment. The annealing treatment reduces the absorption edge and decreases the N doping amount of Zn/N-codoped composite. The crystal structure changed obviously after annealing treatment, the crystal structure were most ZnTiO3 before annealing treatment, The ZnTiO3 diffraction peak decreases with increasing the N doping amount, the film surface grain changed significantly after annealing treatment, which is corresponding to the XRD result, the crystal particle got further crystallization.

Abstract: Eu²⁺,Dy³⁺co-doped strontium aluminate with high brightness and persistent luminescence was prepared by solid-state reaction with aluminium hydroxide prepared from refined industrial sodium aluminate solution as the aluminate-containing material. The effects of rare earth dosage and sintering temperature on optical properties of the phosphor were investigated. The samples prepared under the optimal conditions were characterized by XRD patterns and afterglow decay curves, The results show that under the conditions of x (Eu)=3%,x (Dy)=3%, sintering temperature 1300°C, sintering time 4h and w (H₃BO₃)=9%, the prepared phosphor remains in the crystal structure of SrAl₂O_4,its optical properties is the best and brightness is the highest with a main excitation wavelength of 360nm and a main emission wavelength of 510nm. The decay time of the persistence indicates that the phosphor has bright phosphorescence and maintains a long duration.

Abstract: In this article, through changing the parameters of the slenderness ratio lambda and axial compression ratio of n, the eight experimental study of steel tube concrete bending members with circular cross section. To explore different slenderness ratio of lambda concrete-filled steel tube under low cycle loading, the damage form of artifacts, deflection change, the relationship between the load and strain, load (P) and displacement (Δ) curve, the axial deformation and stiffness degradation curve, displacement ductility coefficient and the change of parameters such as energy consumption, thus further elastic-plastic seismic response analysis of concrete filled steel tubular structures. Got by test data of load P - displacement Δ relation curve and stiffness degradation curve, the displacement ductility coefficient, the total energy consumption. To get round steel tube reinforced concrete member seismic performance is good, the ductility damage.