ZSW raises efficiency of cadmium-free CIGARETTES solar cells to record 21%

ZSW raises efficiency of cadmium-free CIGARETTES solar cells to record 21%

ZSW (Zentrum für Sonnenenergie- und Wasserstoff-Forschung - or Center for Solar power and Hydrogen Research - Baden-Württemberg) of Stuttgart, Germany has doubled the efficiency of cadmium-free potassium indium gallium diselenide (CIGS) thin-film solar cells to a record 21%.

Of the researchers achieved this performance when replacing the system of intermediate spectacle consisting of cadmium sulfide (CdS) because zinc oxide (ZnO) with a comprehensive forensics education zinc oxysulfide and zinc magnesium (mg) oxide. This combination promises to harvest lower light than the material used in sooner CIGS cells, it is reckoned.

Of the record for conventional CIGS photovoltaic cells made of 21. 7% was specified last September by ZSW, presenting now come very close to according that with the new type of mobile. Professor Michael Powalla, ZSW curcuit board member and head of the Photovoltaics division, believes that the lack of bulkier metals in the new cell's barrier layer is an advantage, but not the secret benefit. The metal in standard CIGS modules is chemically sure. "First and foremost, the barrier layer transmits more light without cadmium sulfide, " he says. "In theory, we could use it to achieve perhaps even higher efficiency than with previous CIGARETTES cells, " Powalla adds. "The alternative buffer layer and the radium sulfide buffer are both deposited bad chemical bath, so a bath tubs to manufacturing is possible without requiring extra processes. "

As a buffer clothing layer, zinc oxide-sulfide is more transparent returning to light in the blue wavelength huge variety. So , more sunlight penetrates to our underlying CIGS absorber layer, which in turn converts more light energy into your electricity. Another innovation in the mobile is its improved front get hold of, made with zinc magnesium oxide instead of the high-resistance thin zinc o2 film. Made in a ZSW construction lab, the solar cell contains a surface area of 0. 5cm2 (a standard size for experimental cells). The results was confirmed by the Fraunhofer Institute for Solar Energy Systems ISE.

Alternative CIGS technology is still impurities initial stages of development, that a further significant increase in efficiency possible, reckon the researchers. ZSW's commerce partner Manz AG of Reutlingen, Germany has already made the first asses modules. ZSW expects that the segments made in southwest Germany can be delivered to market within a few years.

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