Researchers from the Swiss Federal Laboratories for Supplies Science and Know-how (Empa) have developed a brand new low-temperature manufacturing course of for bifacial thin-film photo voltaic cells primarily based on copper indium gallium diselenide (CIGS). This resulted in a report yield of 19.8% for entrance lighting and 10.9% for rear lighting.
From pv journal in France
Researchers from Empa have developed a brand new low-temperature manufacturing course of that produces CIGS bifacial thin-film photo voltaic cells with an effectivity yield of 19.8% for the entrance gentle and 10.9% for the again gentle. lights
“It is rather troublesome to get good vitality conversion effectivity for photo voltaic cells with clear conductive contacts on the back and front,” mentioned Ayodhya Tiwari, the chief of Empa’s thin-film PV lab.
Excessive-efficiency CIGS photo voltaic cells are normally made in a high-temperature deposition course of. At temperatures above 550 C, a chemical response happens, leading to a gallium oxide interface layer that blocks the present move generated by daylight. This reduces the vitality conversion effectivity of the cell.
The Empa group has developed a brand new low-temperature deposition course of that produces much less gallium oxide, paving the way in which for larger cell efficiencies. They used a small quantity of silver to decrease the melting level of the CIGS alloy and obtain absorber layers with good digital properties at a deposition temperature of solely 350 C. They analyzed the multi-layered construction utilizing high-resolution transmission electron microscopy (TEM) and didn’t detect any gallium oxide on the interface.
The cell achieves effectivity values of 19.8% for entrance illumination and 10.9% for again illumination. The Fraunhofer Institute for Photo voltaic Power Programs (ISE) independently verified the values through the use of the identical cell on a glass substrate, in response to Empa.
The group additionally succeeded in making a bifacial CIGS photo voltaic cell on a versatile polymer substrate. Scientists say they hope it would broaden the spectrum of potential purposes for such cells, because of the lightness and adaptability of the supplies.
The researchers additionally developed a bifacial GICS-perovskite tandem cell. They revealed their findings in “Effectivity increase of bifacial Cu(In,Ga)Se2 thin-film photo voltaic cells for versatile and tandem purposes with silver-assisted low-temperature course of,” just lately simply revealed on Pure Power.
“Bifacial CIGS know-how has the potential to provide vitality conversion efficiencies of greater than 33%, opening up new potentialities for thin-film photo voltaic cells sooner or later,” mentioned Tiwari.
He’s now making an attempt to ascertain collaborative relationships with main laboratories and corporations throughout Europe to facilitate technological growth and industrial manufacturing on a bigger scale.
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