At the 2nd International tandemPV Workshop in Freiburg, Germany (30 May-1 June), Freiburg-based Fraunhofer Institute for Solar Energy Systems ISE has reported that, by using a new anti-reflection coating, it has increased the solar energy conversion efficiency of the best four-junction solar cell to date from 46.1% to 47.6% at a light concentration of 665 suns...
Source: http://www.semiconductor-today.com/news ... 0522.shtml