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Is it polycarbonate or PMMA or some other material which traps photons? It is for: http://www.en.ideas4all.com/ideas/57580-innovation_in_a_solar_panel__innovacion_en_un_panel_solar
chlorophyll. or a silicon semiconductor.
http://www.nature.com/news/2008/080326/full/452400a.html
Or maybe a half-silvered "one-way" mirror....
another form of 'metamaterials'?