Facet-selective morphology-controlled remote epitaxy of ZnO microcrystals via wet chemical synthesis

Abstract

We report on morphology-controlled remote epitaxy via hydrothermal growth of ZnO micro- and nanostructure crystals on graphene-coated GaN substrate. The morphology control is achieved to grow diverse morphologies of ZnO from nanowire to microdisk by changing additives of wet chemical solution at a fixed nutrient concentration. Although the growth of ZnO is carried out on poly-domain graphene-coated GaN substrate, the direction of hexagonal sidewall facet of ZnO is homogeneous over the whole ZnO-grown area on graphene/GaN because of strong remote epitaxial relation between ZnO and GaN across graphene. Atomic-resolution transmission electron microscopy corroborates the remote epitaxial relation. The non-covalent interface is applied to mechanically lift off the overlayer of ZnO crystals via a thermal release tape. The mechanism of facet-selective morphology control of ZnO is discussed in terms of electrostatic interaction between nutrient solution and facet surface passivated with functional groups derived from the chemical additives.

Photoassisted High-Performance Lithium Anode Enabled by Oriented Crystal Planes

“…In addition, the relatively small electron–hole pair recombination rate of the (002) facet effectively promotes the enhancement of the photoassisted performance. The voltage curves under the first light/dark conditions are shown in Figure d,e, and the Li nucleation overpotential under light is significantly reduced . Then at a current density of 2 mA cm –2 , the PAZRBs were stably cycled for over 700 h while a low overpotential was maintained under illumination (Figure S29), and the average CE for 300 cycles was 99.3% (Figure g).…”

“…The voltage curves under the first light/dark conditions are shown in Figure 7d,e, and the Li nucleation overpotential under light is significantly reduced. 59 Then at a current density of 2 mA cm −2 , the PAZRBs were stably cycled for over 700 h while a low overpotential was maintained under illumination (Figure S29), and the average CE for 300 cycles was 99.3% (Figure 7g). As the number of cycles increases, although the ZNA/MF-12 electrode in the dark has a higher CE, the ZNA/MF-12 electrode in the light has a higher CE and cycling stability.…”

Simulation study of ZnO nanorod geometry for the development of high-performance tactile sensors and energy harvesting devices

“…Often chemical growth process of ZnO NRs leads to the growth of pyramid-like hexagonal structures in which the lower end of the NR is much wider relative to the top end [28,29]. Hence simulations on pyramid-like hexagonal structures are carried out.…”

Lattice modulation strategies for 2D material assisted epitaxial growth

“…By selecting the 2D materials and the substrate pairs, the atomic interaction at the heterointerface in remote epitaxy could be modulated to adapt to various application scenarios. Following this instruction, many studies have achieved remote epitaxy on various material sets, including arsenide, nitrides, perovskite, and II-VI semiconductors [ 41 , 46 , 47 , 51 , 57 – 69 ]. The as-obtained epilayers perform well in the strain status, dislocation density, and heterointerface coupling strength, which is favorable for next-generation optoelectronics and electronics applications [ 70 , 71 ].…”