Silica Nanoparticles And Solar Cells
Scientists laptop battery have been working to find better materials and methods to create high-performance solar cells. U.S. scientists, a new study found that in silicon solar cells formed on the surface layer of silicon nanoparticle films can enhance the ability of its energy conversion and reduce the battery's own heat and prolong life. Relevant papers will be published in "Applied Physics Express" (Applied Physics Letters) on.
The study was conducted by physicists at the University of Illinois Munir Nayfeh leadership, mainly targeted at the ultra-violet absorption and transformation. In terms of traditional solar cells, ultraviolet light leaking out of line either directly or by absorption of silicon devices, but it is converted into heat instead of electricity, which may affect the service life. In 2004, published in the "Photonics Technology Letters" (Photonics Technology Letters) in a study, Nayfeh confirmed that the UV lines with the appropriate nano-scale particles effectively combined to produce electricity.
In order to achieve practical results, Nayfeh and his colleagues conducted a new study. They first use its own developed a proprietary technology to larger silicon switch is made of discrete nano-scale particles, they will be issued in different colors of fluorescence. Then, the researchers of these particles dispersed in isopropyl alcohol and wipe the surface of the solar cell. When the alcohol evaporates, the surface of the battery will eventually form a tight layer of nano-granular films.
The researchers found that if the solar cells covering the surface is the thickness of 1 nm blue fluorescent nano-particles thin-film, the entire cell will be able to transform more than 60% of the UV lines, but the visible light, the conversion rate of increase less than 3%. However, if the battery is the thickness of the surface covered by 285 nm red fluorescent particle film, then the ultraviolet ray acer battery can increase the conversion rate of 67%, while the enhancement of visible light can reach 10%.
Nayfeh that the performance of solar cells such improvements should be more attributed to the improvement of the battery voltage rather than current. He said, "Our study conclusions indicate that charge transfer within the thin film and nano-particle interface, the importance of the amendment."
Nayfeh said that the new coating process can easily incorporated into the current solar cell manufacturing process, while the costs are not an additional increase.
Nokia intends to be completed end of this year recovery plan for bad batteries
Nokia Corporation (Nokia Corp.) Spokesman Marianne Holmlund said the company plans to complete its year-end 2007, the battery restoration program. The company currently too much heat is being replaced with 4,600 million cell phone batteries.
According to "Nihon Keizai Shimbun" (Nikkei) reported, Holmlund said, Nokia is working with Matsushita Electric Industrial Co., Ltd. (Matsushita Electric Industrial Co.) Cooperation to ensure that problems with lithium batteries can be repaired as soon as possible. Those batteries from Matsushita Battery Co., Ltd. (Matsushita Battery Industrial Co.) Manufacturing.
The Finnish mobile phone giant has released the battery product advice, because of the problems these batteries overheating while charging the battery itself, leading to deformation. Nokia insists that this is not a serious injury due to battery overheating carried back to the response, but consumers demand the product should be replaced.
Holmlund said that Nokia batteries to fix all problem is very difficult, like the call back to the car and computer parts products, fixed rates are usually 30% or less.
If the battery is low repair rate, Nokia is likely to consider continuing the Dell Latitude D520 Battery in 2007 after the rehabilitation program.
Holmlund did not indicate the cost of replacement batteries. Once the battery is expected to identify the cause of the malfunction, Nokia and Panasonic will be sharing costs.
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