Photovoltaic stability of flexible silicon-based solar cells under different bending times

Recently, the research team of Ye Changhui, a researcher at the Department of Micro-nano Technology and Devices of the Institute of Solid State Physics, Chinese Academy of Sciences, has made new progress in the research of flexible monocrystalline silicon micro-nanostructured solar cells. The relevant results were published in the form of a cover paper. Nanores. 2015, 8(10), 3141-3149.

The crystalline silicon solar cell has become the most popular solar cell by virtue of its mature preparation process and high photoelectric conversion efficiency, but the inherent rigid structure of the monocrystalline silicon substrate has limited its use in building integration and wearable Applications in electronic products. Flexible monocrystalline silicon-based solar cells have characteristics such as light weight, low cost, and foldability, which are of great significance for practical applications.

The Solids Research Group has developed a technology for thinning monocrystalline silicon wafers. Using a simple manufacturing process, a flexible silicon pyramid micro/nanostructure/PEDOT:PSS solar cell with a photoelectric conversion efficiency of 6.3% was constructed. Experimental tests have shown that, after various times of mechanical bending (bending angle of 800), the photovoltaic device characteristics such as open circuit voltage, short-circuit current, and fill factor of the battery exhibit excellent stability (the change rate is less than 10%). It lays the foundation for the practical application of next-generation portable electronic devices for flexible silicon-based solar cell devices. The above research was funded by the Ministry of Science and Technology's "973 Program", the National Natural Science Foundation of China, the Chinese Academy of Sciences 100-person plan and the Chinese Academy of Sciences International Innovation Team project.

Neodymium Magnet, is the most widely used type of Rare Earth Magnet,also known as the  Permanent Magnet which have strongest magnetism in normal working temperature,is made from an alloy of neodymium,iron, boron to form a steady column structure that has arrayed in same direction. Neodymium magnets are the most commercial permanent magnet and have replaced other permanent magnet in many industrial areas.

The structure of Ndfeb Magnet is very vulnerable when meet oxygen, iron element and separate from Nd2Fe14B and become Fe2O3 that structure is arrayed randomly which will cause the magnetic field become directionless and decline the magnetism. Protective coatings has been added to the neodymium magnet to make it more commercial.Usually,many of the coating are through electrical plating means. coatings like Nickel,Zinc,NiCuNi, Epoxy, Gold, color glaze will be the surface coating treatment.

 Main Manufacturing process of ndfeb magnets

1.Pressing ndfeb garins: pressing process needed to operate in strong magnetic environment.

2.Sintering of ndfeb blocks: sintering process usually in a vacuum furnace at 800~1400 ℃ environment .

3.Wire cut: ndfeb magnet usually are in small and different sizes, cutting process need operated on wire cut machine controlled by automatic system.

4.Grinding of Ndfeb magnet: Operate on artificial diamond polish tool.

 5.Plating of ndfeb: Plating need a lot of poisonous and deadly chemicals ,only expert plating factory could get the business license from China government. Thus we usually send for plating company,

 6.Magnetization of NdFeB,  north pole magnetization facility and south magnetization facility are both needed.(2~30 Koe)

 Application

Neodymium magnet have a widely application area on modern electric and electronic product,computer,earphone,motor,alternator, sensor, MRI... By using the neodymium magnet , product size will smaller and function will better. Neodymium magnet also be called as ndfeb magnet,they could catch iron steel, hence neodymium magnet could be designed as a magnetic catcher for catching things with ferromagnetic surface.

 The curie temperature for the neodymium magnet is from 305~330 ℃.pending on the material grade , working temperature for different neodymium magnets are also different.

Operating the magnet at highest working temperature will decreasing its` magnetism 8~13 % each time of use, thus please carefully with product designs.

The great magnetic force might cause injure to body parts pinched two magnets or with iron steel.Big magnet would broke bones,do not swallow magnets,or using magnet two close to eyes., it will cause injure.The huge magnetic field of neodymium magnet have hazard to electronic product like watch,credit card,floppy disc, medical equipment,phone...

Please keep magnet away from these things.

Neodymium Magnet

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