Structural and optical properties of ultrathin ZnO nanoneedles grown on GaN substrate by hybrid approach

► Low cost method is used for large-scale growth of ZnO nanoneedles on GaN. ► Structural and optical properties have been studied for ZnO nanoneedles grown on GaN. ► Nanoneedles have ultrathin nanotips which can be used for the fabrication of heterojunction. ► We used the low temperature hybrid method for the growth of ZnO nanoneedles on GaN.