Fabrication and repair of GaN nanorods by plasma etching with self-assembled nickel nanomasksShiying Zhang, Lei Zhang, Yueyao Zhong, Guodong Wang and Qingjun XuEur. Phys. J. Appl. Phys., 93 3 (2021) 30405DOI: https://doi.org/10.1051/epjap/2021210002