Epitaxial growth of ZnO nanowall networks on GaN/sapphire substrates

Abstract

Heteroepitaxy of vertically well-aligned ZnO nanowall networks with a honeycomblike pattern on GaN∕c-Al2O3 substrates by the help of a Au catalyst was realized. The ZnO nanowall networks with wall thicknesses of 80–140nm and an average height of about 2μm were grown on a self-formed ZnO thin film during the growth on the GaN∕c-Al2O3 substrates. It was found that both single-crystalline ZnO nanowalls and catalytic Au have an epitaxial relation to the GaN thin film in synchrotron x-ray scattering experiments. Hydrogen-sensing properties of the ZnO nanowall networks have also been investigated.

Ultraviolet Sensors Based on Two-Dimensional Zinc Oxide Structures

“…Whereby using alumina (Al 2 O 3 ) and silicon will result in the growing of nanorods [49]. Vapour-liquid-solid (VLS) mechanism using a gold catalyst was used to grow 2D ZnO nanowalls in this process, a high deposition temperature is used (~900-1100°C) [50][51][52].…”

Structural and optical analysis of ZnBeMgO powder and thin films

“…ZnO is a wide bandgap semiconductor with energy band gap of 3.37 eV and high excitation binding energy (60 meV) at room temperature which makes its versatile for potential applications in many areas like flame detection, missile plume sensing, air quality monitoring, piezoelectric and ferroelectric usage, accurate measurement of radiation for the treatment of UV irradiated skin, ozone hole detection and space-to-space transmission [1][2][3][4][5][6][7][8][9][10][11]. During this decade, the band gap modulation of ZnO films has been achieved by alloying it with much wider band gap semiconductor MgO (7.8 eV) [12][13][14][15][16][17][18][19][20].…”

Effect of Li-doped concentration on the structure, optical and electrical properties of p-type ZnO thin films prepared by sol–gel method

“…All these applications require high crystal quality of ZnO films. Today, various deposition techniques have been used to fabricate ZnO thin films, such as chemical vapor deposition (CVD) [2], single-source chemical vapor deposition (SSCVD) [3,4], metal organic chemical vapor deposition (MOCVD) [5], sputtering [6], molecular beam epitaxy (MBE) [7], pulsed laser deposition (PLD) [8], sol-gel method [9], spray pyrolysis [10], etc. Among these techniques, the sol-gel method is popular due to its simplicity, safety and low cost.…”