We present an experimental method for in-situ observation of the lattice behavior of a single crystal silicon nanobelt during uniaxial tensile testing.An in-situ silicon nanobelt tensile testing device for transmissio...We present an experimental method for in-situ observation of the lattice behavior of a single crystal silicon nanobelt during uniaxial tensile testing.An in-situ silicon nanobelt tensile testing device for transmission electron microscopy is developed.Atomic behavior and lattice parameters of the nanobelt are studied using selected area electron diffraction.A statistical and least square methods are used for reducing the measurement errors of the lattice parameters.The results suggest that the trends of the lattice parameters during the tensile test are in agreement with the increasing tensile stress in the silicon nanobelt.Furthermore,the local strain calculated from lattice parameters and the average strain of the nanobelt are compared.展开更多
Highly conducting ZnO：Al （AZO） films are normally prepared through substrate heating and post-annealing in reducing atmosphere, which is deleterious to maintain the high transparency of films and the overall solar ...Highly conducting ZnO：Al （AZO） films are normally prepared through substrate heating and post-annealing in reducing atmosphere, which is deleterious to maintain the high transparency of films and the overall solar cell performance. Here we fabricate AZO films through one-step sputtering at room temperature using oxygen-deficient targets prepared via double crucible method. The best-performed AZO film achieves a low resistivity of 4.4 x 10-4 Ω cm, a high haze factor of 35.0%, and optimizes the efficiency of Cu （In, Ga）Se2 solar cell with a high value of 14.15%. This letter demonstrates that oxygen deficiency can induce high surface texture, conductivitw and boost solar cell performance.展开更多
A novel yttrium citrate-templated conversion method for morphology controlled synthesis of Y2O3 microspheres, microflowers and microsheets was reported for the first time. The precursors with controllable morphologies...A novel yttrium citrate-templated conversion method for morphology controlled synthesis of Y2O3 microspheres, microflowers and microsheets was reported for the first time. The precursors with controllable morphologies were synthesized with a homogenous precipitation method in aqueous solution without any surfactant. Y2O3 samples with well-preserved morphological architectures were obtained by a subse-quent thermal transformation strategy. The chemical formula of the precursor was identified and a two-stage growth mechanism was proposed. The effects of the aging time, reaction temperature, reactant concentration and molar ratio of yttrium nitrate to sodium citrate were discussed. The photoluminescence properties of the Y2O3：Eu3＋ microspheres, microflowers and microsheets prepared were also studied.展开更多
基金Supported by the National Basic Research Program of China under Grant Nos 2011CB309501,2012CB933301the Key Project of National Natural Science Foundation of China(NSFC)under Grant Nos 60936001,91123037+1 种基金the Youth Project of National Natural Science Foundation of China(NSFC)under Grant No 81201358the Fund for Creative Research of NSFC under Grant No 61021064.
文摘We present an experimental method for in-situ observation of the lattice behavior of a single crystal silicon nanobelt during uniaxial tensile testing.An in-situ silicon nanobelt tensile testing device for transmission electron microscopy is developed.Atomic behavior and lattice parameters of the nanobelt are studied using selected area electron diffraction.A statistical and least square methods are used for reducing the measurement errors of the lattice parameters.The results suggest that the trends of the lattice parameters during the tensile test are in agreement with the increasing tensile stress in the silicon nanobelt.Furthermore,the local strain calculated from lattice parameters and the average strain of the nanobelt are compared.
基金financially supported by the National 863 Program of China(No.2011AA050505)the National Science Foundation of China(Nos.51121064 and 51125006)the Science and Technology Commission of Shanghai(No.12XD1406800)
文摘Highly conducting ZnO：Al （AZO） films are normally prepared through substrate heating and post-annealing in reducing atmosphere, which is deleterious to maintain the high transparency of films and the overall solar cell performance. Here we fabricate AZO films through one-step sputtering at room temperature using oxygen-deficient targets prepared via double crucible method. The best-performed AZO film achieves a low resistivity of 4.4 x 10-4 Ω cm, a high haze factor of 35.0%, and optimizes the efficiency of Cu （In, Ga）Se2 solar cell with a high value of 14.15%. This letter demonstrates that oxygen deficiency can induce high surface texture, conductivitw and boost solar cell performance.
基金Project supported by the National Natural Science Foundation of China (50990304)State "973" Project (2007CB936704)
文摘A novel yttrium citrate-templated conversion method for morphology controlled synthesis of Y2O3 microspheres, microflowers and microsheets was reported for the first time. The precursors with controllable morphologies were synthesized with a homogenous precipitation method in aqueous solution without any surfactant. Y2O3 samples with well-preserved morphological architectures were obtained by a subse-quent thermal transformation strategy. The chemical formula of the precursor was identified and a two-stage growth mechanism was proposed. The effects of the aging time, reaction temperature, reactant concentration and molar ratio of yttrium nitrate to sodium citrate were discussed. The photoluminescence properties of the Y2O3：Eu3＋ microspheres, microflowers and microsheets prepared were also studied.
