GaN/AlGaN multiple quantum wells grown on transparent and conductive −201-oriented β-Ga2O3 substrate for UV vertical light emitting devices, IA Ajia, Y Yamashita, K Lorenz, MM Muhammed, L Spasevski, D Almalawi, J Xu, K Iizuka, Y Morishima, DH Anjum, N Wei, RW Martin, A Kuramata, IS Roqan, Appl. Phys. Lett. 113, 082102 2018.