Raising the efficiency of polycrystalline cells with new luminescent EVA film

Chinese researchers have developed a pure EVA film which they claim can enhance the conversion efficiency of conventional crystalline solar cells by around 0.50%. The film is able to convert UV light into strong visible light.

Researchers at China’s Hebei University of Technology have developed a luminescent ethylene-vinyl acetate (EVA) copolymer film that is said to have the potential to raise the efficiency of conventional polycrystalline solar cells by around 0.50%.

The scientists affirmed that the pure film has a high thermal stability, which was demonstrated under light-soaking test for 500 h, with no luminescence degradation having been observed.

The EVA film is based on Europium3+, which is a monoatomic trication and an elemental europium able to convert UV light into strong visible light, as a down-shift material. Each Europium3+ atom is linked to four ligands, which also carry favorable light-harvesting abilities, and one hexadecyltrimethylammonium ion.

Efficiency increase by 0.51%

The new copolymer film, described by the formula Eu(ND)4CTAC/EVA, was used for the coating of large area polycrystalline silicon solar cells with an active area of 110 cm2.

“A series of luminescent films with varying complex concentrations have been compared and studied in photovoltaic characterization,” the research team wrote. “The results show that in the best case, the conversion efficiency of poly-crystalline silicon solar cells increases from 15.06% to15.57% by using the luminescent film.”

High photostability

The scientists further explained that the new luminescent film has also showed excellent photostability during the experiment. According to their findings, the device maintained its luminescence intensity unchanged even under continuous UV radiation at 30°C for 500 h. “The realization of employing stable Eu(ND)4CTAC/EVA film as a medium to enhance the PCE of Si-based solar cells demonstrated here makes it attractive for photovoltaic industry,” they also affirmed.

The results of the research are presented in the paper Photovoltaic efficiency enhancement of polycrystalline silicon solar cells by a highly stable luminescent film, published in Science China Materials.

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