A new perovskite + CIGS tandem thin-film solar module — presented by researchers from KIT, ZSW, and the Belgian research institute imec at the recent PSCO international conference in Genova — has achieved a record solar conversion efficiency (for the type) — 17.8%.
“Our prototype demonstrates that scalable perovskite/CIGS solar modules can drastically surpass the efficiency of a separate solar module made of these materials,” commented Dr Ulrich W Paetzold of KIT.
As an explanation of the value of the tandem approach, the semi-transparent upper perovskite portion of the tandem solar module works to capture most effectively the higher-energy parts of the solar spectrum, while the lower CIGS (Copper Indium Gallium Selenide) portion captures the infrared parts and others. Together they capture and convert more of the spectrum than either can on its own.
To further illustrate that point, the current world record for perovskite module solar conversion efficiency (at this scale) is 15.3%, and the CIGS solar module conversion efficiency record is 15.7%.
The press release provides a few more details: “Besides, the stacked module implements a fully scalable device concept that matches industrial needs. Both, the perovskite top module and the CIGS bottom module feature an aperture area of 3.67 square centimeter and a monolithic interconnection scheme, using 4 and 7 module cell stripes respectively. The area losses are less than 8% for both technologies and the interconnection can be laser-processed, allowing industrial scaling to stacked modules of several square meters.”
Previously, this perovksite/CIGS tandem approach was only explored through small-scale solar cells, rather than through full-size modules.
Photo via imec/ZSW/KIT
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