Valuable metal recycling from thin film CIGS solar cells by leaching under mild conditions
Artikel i vetenskaplig tidskrift, 2023

The increase in the manufacturing of copper-indium-gallium-diselenide (CIGS) thin film photovoltaics is accompanied by a growing amount of production waste, which contains a mixture of valuable, critical and hazardous elements. However, industrial recovery and reuse processes of these elements for production of new photovoltaics are still absent. In this paper, the possibility of using benign leaching conditions for recovering mainly silver and indium from production waste flexible CIGS solar cells was investigated, along with the contamination levels from other industrial elements in the leachate. At the same time, the prospect of selective leaching of contaminants was assessed, aiming to purer streams of the valuable metals and thus their reuse in new products. The results show an increase in the leaching yields of Ag and In when acid concentration and surface to liquid ratio (A:L) increase, however, this is also true for contamination. A complete Ag recovery and 85% recovery of In was achieved with 2 M HNO3 and A:L equal to 1:3 cm2/ml after 24 h of leaching at room temperature. Under the same conditions, leaching with 0.5 M HNO3 extracts 85% Ag and 30% In, with correspondingly reduced contamination levels. Finally, leaching with 0.1 M HNO3 proved to be promising for achievement of higher Ag purity through an initial step of Zn selective leaching for 1 h.


Photovoltaics recycling



CIGS cell

Metal recovery


Ioanna Teknetzi

Chalmers, Kemi och kemiteknik, Energi och material

Stellan Holgersson

Chalmers, Kemi och kemiteknik, Energi och material

Burcak Ebin

Chalmers, Kemi och kemiteknik, Energi och material

Solar Energy Materials and Solar Cells

0927-0248 (ISSN)

Vol. 252 112178

Återvinning av nödvändig metall från avfallssolceller för återanvändning i hållbar solenergiindustri

Energimyndigheten (49349-1), 2020-04-01 -- 2023-08-31.





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