Coalescence of ZnO nanorods grown by chemical bath deposition

In this work, a way to grow isolated and coalesced ZnO nanorods on p-GaN/sapphire structure is presented. Chemical bath deposition [1],[2] was used to grow ZnO nanorods of device-quality on a p-GaN/n-GaN/sapphire template, simply controlling the duration time of the growth process and the concentration of the nutrient solution in the bath. Several p-GaN templates were soaked in a nutrient solution, prepared with different concentration of zinc nitrate hexahydrate (Sigma-Aldrich, reagent grade 98%) and hexamethylenetetramine (Alfa Aesar, ACS 99%) in deionized water, while being heated at a temperature of 80 °C for a period varying from 8 to 25 hours; then, the samples were left in the soluti…