Beijing Solar Energy Research Institute Co.

Beijing, China

Beijing Solar Energy Research Institute Co.

Beijing, China

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Shu Q.,Tsinghua University | Wei J.,Tsinghua University | Wang K.,Tsinghua University | Song S.,Beijing Solar Energy Research Institute Co. | And 7 more authors.
Chemical Communications | Year: 2010

Hybrid photoelectrochemistry and heterojunction solar cells made from carbon nanotubes and silicon nanowires show high energy conversion efficiencies of up to 6%. © The Royal Society of Chemistry 2010.


Jia Y.,Tsinghua University | Li P.,Tsinghua University | Gui X.,Tsinghua University | Wei J.,Tsinghua University | And 6 more authors.
Applied Physics Letters | Year: 2011

We report a metal-insulator-semiconductor heterojunction solar cell by depositing a carbon nanotube film onto silicon substrate, followed by acid oxidation of the Si surface to form a thin oxide layer at the junction interface. The nanotube-oxide-Si solar cells with polymer encapsulation show stable efficiencies of above 10%, owing to enhanced photon absorption, inhibited charge recombination, and reduced internal resistance. Parallel and series connections without sacrificing cell efficiencies were demonstrated. © 2011 American Institute of Physics.


Wu S.,Chongqing University | Wu S.,Beihang University | Wang C.,Beihang University | Cui Y.,Beijing Solar Energy Research Institute Co.
Applied Surface Science | Year: 2014

Bismuth oxychloride (BiOCl) granular and flake-like films with specific {0 0 1} crystal facets are synthesized by a facile hydrolysis route. The percentage of reactive {0 0 1} facets is up to 97.36% in granular film and 91.69% in flake-like film, respectively. It is found that the synthesized granular film is composed by the nano grains with average size around 5-10 nm, but the flake-like film contains the flakes originated from the large nano crystals. The percentage of the {0 0 1} reactive facets and morphology of the BiOCl film can be tuned by adjusting the concentration or the pH value of the solution during the synthesis process, companied with the appearance of the (1 0 1), (1 0 2), and (1 1 0) facets. The formation mechanism of {0 0 1}-preferential orientation has been rationally explained in terms of crystal growth habit and dynamics. Photocatalytic degradation of RhB dye has been observed under UV light, representing that the flake-like film with {0 0 1} facets preferred orientation exhibits excellent photoactivity. © 2013 Elsevier B.V.


Xiao S.Q.,Nanyang Technological University | Xu S.,Nanyang Technological University | Wei D.Y.,Nanyang Technological University | Huang S.Y.,Nanyang Technological University | And 2 more authors.
Journal of Applied Physics | Year: 2010

Hydrogenated silicon (Si:H) thin films were fabricated on glass substrates by low frequency inductively coupled plasma-assisted chemical vapor deposition using a silane precursor with low hydrogen dilution at room temperature. The crystallinity and microstructure properties of the Si:H thin films deposited at different inductive radio-frequency (rf) power density were systematically studied by Raman spectroscopy, x-ray diffraction, and scanning electron microscopy. We found that at a low rf power density of 16.7 to 20.8 mW/ cm 3, the structure of silicon thin films evolves from a completely amorphous phase to an intermediate phase containing both amorphous and microcrystalline silicon. As the power density is increased to a moderate value of 25 mW/ cm3, a highly crystallized (111)-preferred hydrogenated microcrystalline silicon (μc-Si:H) film featuring a vertically aligned cone-shaped structure, is emerging. Both the crystallinity and deposition rate exhibit a monotonic increase with the increase in the rf power density, reaching a maximum value of 85% and 1.07 nm/s, respectively, at a power density of 41.7 mW/ cm3. Scanning electron microscopy reveals that continuous and dense μc-Si:H films with grain size of tens to hundreds nanometers can be achieved deterministically without the formation of amorphous incubation layer, and this is of great importance for synthesis of multilayer structures in p-i-n solar cells. The formation mechanism of the μc-Si:H films and the elimination of the amorphous incubation layer are explained in terms of the high electron density and the plasma-surface interactions. © 2010 American Institute of Physics.


He Z.,Beijing Solar Energy Research Institute Co.
ICMREE 2013 - Proceedings: 2013 International Conference on Materials for Renewable Energy and Environment | Year: 2013

This paper introduces a solar raw petroleum heating system to reduce viscosity of the petroleum for its easier transport. Some aspects of design and operation are described in the paper. Natural gas, oil and water are simultaneously contained in the raw petroleum, which need to be heated up to 55°C-60°C in summer and to 68°C in winter. In order to make the system reliable, heat-pipe evacuated tube solar collectors have been used for the solar heating system. Totally 245 sets of heat-pipe evacuated tube collectors, including 1,960 tubes with total aperture area of 392 m2 are adopted. Practical operation results have shown that about 30% of daily average natural gas consumption could be saved. © 2013 IEEE.


Zhang Y.C.,Beijing Solar Energy Research Institute Co.
Applied Mechanics and Materials | Year: 2014

Stearic acid/silicon dioxide composite shape-stabilized phase change materials with different mass fraction of stearic acid have been successfully prepared using sol-gel methods. In such an organic/inorganic composite structure, the stearic acid was used as the filling material that is the latent heat storage phase change material (PCM), and the silicon dioxide acted as the matrix material which prevented the leakage of the melted stearic acid. The structure, morphology, thermal properties, thermal conductivity of the composite PCM were determined by X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR) spectra, Scanning electron microscope (SEM) and Differential scanning calorimetry (DSC). The results show that the form-stable composite PCM has the optimal effect, preventing the leakage of stearic acid from the matrix of silicon dioxide, emerges when the composite containing 50% (mass fraction) stearic acid. The latent heat and melting temperature of the corresponding composite PCM is measured as 85.7J/g and 52.2 °C respectively. Meanwhile, the thermal conductivity of the composite PCM could be improved effectively by using silicon dioxide as a supporting material. © (2014) Trans Tech Publications, Switzerland.


He Z.,Beijing Solar Energy Research Institute Co.
Energy Procedia | Year: 2014

A solar raw petroleum heating system to reduce viscosity of the petroleum for its easier piping transport is introduced in this paper. Some aspects of design and operation are described. Natural gas, oil and water are simultaneously contained in the raw petroleum, which need to be heated during its piping transport. In order to make the system reliable, advanced heat-pipe evacuated tube solar collectors have been used for the solar heating system. Practical operation results have shown that about 30% of daily average natural gas consumption could be saved.


Zhang Y.C.,Beijing Solar Energy Research Institute Co.
Advanced Materials Research | Year: 2013

Ni-Fe layered double hydroxide containing carbonate anion (CO3 2-) has been successfully synthesized by a process of homogeneous precipitation involving urea hydrolysis under hydrothermal conditions. Factors that influence the composition and the crystallinity degree of NiFe-LDH, such as the molar fraction of urea/NO3 - in solution, the total metal ion concentration in solution and the aging time, have been investigated in detail. Structure and morphology of the sample were characterized by X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR) spectra and scanning electron microscope (SEM). The results indicate NiFe-LDH with high purity present well-crystalline, uniform crystallite size. © (2013) Trans Tech Publications, Switzerland.


Bennett I.,Beijing Solar Energy Research Institute Co. | Loiseaux N.,Beijing Solar Energy Research Institute Co.
Energy Procedia | Year: 2012

In this paper a method of measuring the residual strains in a foil-based MWT module is introduced. These strains are a result of differences in thermal expansion coefficients between the different components in the module. The method involves the design and manufacture of a test module allowing the different components to be visualised and the development of a camera system and software for strain measurement and analysis. Strains were measured in the glass, cells and back-sheet foil for a module laminated at 150°C and subsequently cooled to room temperature. The results show that strain is dominated by the glass sheet and that strain is uniform in the glass and cells, but complex in the foil. Strain in the foil and cell is relatively small. Parallel to this, a study was made of the relationship between the position of a conductive adhesive contact in the module and its shape. Analysis of the shape showed that a contact with concave sides was the most stable, whereas contacts with a convex shape result in a weaker interface with the cell and foil. Combining the two techniques allows analysis of the module design, in particular of the interconnections. The results can be used to adjust, for example, the foil specification and the conductive adhesive print size. This will result in an improved module reliability and lifetime.


Zhang Y.C.,Beijing Solar Energy Research Institute Co.
Advanced Materials Research | Year: 2014

In this paper, porous silica antireflective thin film with special nano-structure has been successfully established using glass-cover board as a single precursor through a novel chemical etching route. The process mainly involves selective leaching of active component on the surface of glass such as sodium oxide, calcium oxide. The effects of etching time, acid concentration and temperature on the porous silica antireflective thin film were demonstrated. Surface microstructure and optical properties of the porous silica antireflective thin film were characterized in detail by scanning electron microscopy (SEM), UV-visible (UV-Vis) spectroscopy. The results indicate the porous silica antireflective thin film were composed of granular with diameter less than 30nm, and the thickness of film was in the range of 80~100nm. Enhanced transparency (up to 94.6%) was achieved in a wide wavelength range. © (2014) Trans Tech Publications, Switzerland.

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