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Now, findings by Xincai Wang from the A*STAR Singapore Institute of Manufacturing Technology and co-workers from Nanyang Technological University could turn the tables on silicon nanowires by improving the manufacturing of silicon'nanoholes'arrow cavities carved into silicon wafers
Nanoholes are particularly effective at capturing light because photons can ricochet many times inside these openings until absorption occurs.
One significant problem, notes Wang, is control of the initial stages of nanohole formation crucial period that can often induce defects into the solar cell.
'maskless'approach to producing nanoholes using silver nanoparticles. First, they deposited a nanometer-thin layer of silver onto a silicon wafer
nanohole-infused silicon surface (see image). The team analyzed the solar cell activity of their nanohole interfaces by coating them with a semiconducting polymer and metal electrodes.
Their experiments revealed a remarkable dependence on nanohole depth: cavities deeper than one micrometer showed sharp drops in power conversion efficiency from a maximum of 8. 3 per cent due to light scattering off of rougher surfaces and higher series
resistance effects.""Our simple process for making hybrid silicon nanohole devices can successfully reduce the fabrication costs
which impede the solar cell industry, "says Wang.""In addition, this approach can be transferred easily to silicon thin films to develop thin-film siliconolymer hybrid solar cells with even higher efficiency. e
Nanotech has developed some novel high resolution OVD effects based on nanohole arrays, which differ from conventional OVDS providing easy recognition and verification.
These nanohole structures create new colour shifting effects that provide unique visual features such as 3d, HD, and motion.
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