“…Alternatively, sophisticated integration approaches like selective area growth (SAG) in highly confined patterns, epitaxial lateral overgrowth 6 , deposition on V-groove-patterned substrates 7,8 , III-V nanowire growth 9 or quantum-well-in-nanopillar growth 10 are used to confine the defect formation. Especially aspect ratio trapping (ART) 11,12 a) Electronic mail: Dries.VanThourhout@UGent.be b) Electronic mail: Bernardette.Kunert@imec.be c) also at IMEC, Kapeldreef 75, 3001 Heverlee, Belgium in trenches was successfully applied to realize first III-V transistors on 300 mm Si substrates 13,14 but also explored for laser applications 15,16 . The heteroepitaxial growth in very narrow trenches is very beneficial to reduce the TD density but restricts the total volume of III-V material.…”