The future has grown brighter for solar power,with the setting of a new world record for the efficiency of a silicon/perovskite solar cell in December 2020.Made using a layer of silicon in tandem with a thin-film layer of synthetic perovskite,the cell had an area of 1.12 cm2 and was certified in independent testing by the US National Renewable Energy Laboratory (NREL) in Golden,CO,USA,to be 29.52％ efficient [1].Plainly put,the tandem cell was able to convert nearly 30％ of the simulated sunlight shining on it into electricity.rnThe cell,and the perovskite technology that enabled the record,was developed by Oxford PV,based in Oxford,UK.The company is currently commissioning a production line in its factory in Bran-denburg an der Havel,Germany,to make the world\'s first commer-cial perovskite/silicon cells,156 mm to a side,with an efficiency of about 26％ (Fig.1).When they become available,expected in early 2022,they will be the most efficient commercially available solar cells in the world-industrially produced silicon solar modules are currently hitting efficiencies of 20％-22％.