Imec and kerfless epitaxial wafer start-up, Crystal Solar have demonstrated a homojunction solar cell with a record 22.5% conversion efficiency said to pave the way to low-cost solar wafer commercialisation. The potentially disruptive wafer technology was used to fabricate a standard monocrystalline 156x156mm2 cell on 160um to 180um thick grown n-type wafer with built-in rear …