Imagine buildings in which the windows allow the sun’s light to enter, and at the same time capture the energy from the sun needed to meet all their energy needs. In this seemingly futuristic scenario, the windows become productive solar cells that help us decrease our reliance on fossil fuels and advance towards a greener and cleaner environment. In a recent study carried out at ICFO, researchers have fabricated an optimal organic solar cell with a high level of transparency and a high power conversion efficiency, a promising step forward towards affordable, clean, more widely utilized and urban integrated renewable energies . . .

. . . researchers have been able to implement a semi-transparent cell incorporating a photonic crystal and reach a cell performance almost as good as its opaque counterpart. By adding such extra photonic crystal to the cell, ICFO’s scientists were able to increase the amount of infrared and ultraviolet light absorbed by the cell, reaching a 5.6% efficiency while preserving a transparency almost indistinguishable from normal glass. The results in efficiency and transparency make these cells an extremely competitive product for Building-Integrated Photovoltaic (BIPV) technologies. To reach the adequate architectural look, the color of the cells may be tuned by simply changing the layer configuration of the photonic crystal. . . .

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