Selasa, 04 Mei 2010

Trapping light to improve solar cells

 Scientists have uncovered why thinner solar cells with well organised patterns on their surface are better able to trap and absorb light.
The discovery could mean cheaper and more efficient solar cell technology.
Scientists have known that the efficiency of solar cells is improved when light is allowed to bounce inside the cell, increasing the chances that it will be absorbed.
One way to do this is by 'roughening up' the surface of the solar cell so that photons entering the material tend to be reflected inside it.
Reporting on the pre-publication website ArXiv, Dr Zongfu Yu and fellow researchers from Stanford University in California, have calculated the fundamental limit to the amount of light that can be trapped in a nano photonic solar cell.

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