Qcells, a subsidiary of South Korea’s giant conglomerate Hanwha Corp, has set a world record for the efficiency of a large-area silicon solar cell with a top layer of perovskite, a development that could dramatically shrink the size of projects and slash costs. Qcells says it has achieved cell efficiency of 28.6% on a large commercial-sized cell known as an M10 using the technology, considerably higher than 27% efficiency for crystalline silicon cells and around 21% for traditional commercial silicon solar panels. To be fair, China's Longi…
