At the end of 2016, Solliance started a project to develop a stable, reproducible and industrial up-scaleable process to manufacture CuInGa(Se,S)2 devices using electrochemical deposition, with a cell conversion efficiency above 15%. A record cell with an efficiency of 15.6% was produced only six months later, using electrochemical deposition of copper, indium and gallium. But the only way to create cells using this potential less expensive production technology, is with back-end interconnect te...