Business Green: A German research team last week announced they had broken the conversion efficiency record for a photovoltaic solar cell, in a move scientists claimed represented a “big step” towards delivering solar energy at a lower cost than conventional energy sources. The team at the Fraunhofer Institute for Solar Energy Systems ISE said that they had managed to achieve a record efficiency of 41.1 per cent for the conversion of sunlight into electricity, breaking the Institute’s previous record …