Researchers at the University of Illinois at Urbana-Champaign have achieved new levels of performance for seed-free and substrate-free arrays of nanowires from class of materials called III-V (three-five) directly on graphene. These compound semiconductors hold particular promise for applications involving light, such as solar cells or lasers. - See more at: http://engineering.illinois.edu/news/article/7801#sthash.0XaogWpd.dpuf