Researchers from Swiss research institute Empa have produced a 22.2%-efficient flexible CIGS solar cell on plastic film, a record for that category usable in BIPV, vehicles, satellites and small-scale devices. Manufacturer Flisom is working with the institute on roll-to-roll printing of CIGS cells. The photovoltaic semiconductor material Kesterite (Cu2ZnSnS4, CZTS) has seen some research progress with a paper laying out a technique to produce a 13%-efficient Kesterite cell. The previous record of 12.6% was set in 2013. This research comes from the Nanjing University of Posts & Telecommunications, Fudan University, the Chinese Academy of Sciences and the University of Washington, with the team reaching 12.96% over a 0.11cm2 test cell and 11.7% over a 1.1cm2 test cell. Vast Solar, the…