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UCLA scientists double efficiency of novel solar cell

Nearly doubling the efficiency of a breakthrough photovoltaic cell they created last year, UCLA researchers have developed a two-layer, see-through solar film that could be placed on windows, sunroofs, smartphone displays and other surfaces to harvest energy from the sun.

The new device is composed of two thin polymer solar cells that collect sunlight and convert it to power. It’s more efficient than previous devices, the researchers say, because its two cells absorb more light than single-layer solar devices, because it uses light from a wider portion of the solar spectrum, and because it incorporates a layer of novel materials between the two cells to reduce energy loss.

While a tandem-structure transparent organic photovoltaic (TOPV) device developed at UCLA in 2012 converts about 4 percent of the energy it receives from the sun into electric power (its “conversion rate”), the new tandem device—which uses a combination of transparent and semi-transparent cells—achieves a conversion rate of 7.3 percent.

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