MOCVD of Vertically Aligned ZnO Nanowires Using Bidentate Ether Adducts of Dimethylzinc

Abstract

The dimethylzinc-bidentate ether adducts [Me 2 Zn(1,4-dioxane)] (1), [Me 2 Zn(1,2-dimethoxyethane)] (2) and [Me 2 Zn(1,4-thioxane)] (3) are used as precursors for the growth of vertically aligned zinc oxide (ZnO) nanowires (NWs) by liquid-injection, metal-organic (MO)CVD. The ZnO NWs are deposited on Si(111) and F-doped SnO 2 /glass substrates in the absence of a seed catalyst. The precursors (1) and (2) are used to deposit ZnO NWs at substrate temperatures of 450 8C and 500 8C, whilst higher deposition temperatures of 550-600 8C are necessary to obtain ZnO NWs using (3). X-ray diffraction (XRD) data show that the NWs grown from all three adduct precursors are deposited in the wurtzitic ZnO phase. Room-temperature photoluminescence (PL) data for the ZnO NWs grown using (1) and (2) show an intense peak at 3.28 eV due to near band-edge emission with a very low intensity of defect-related green luminescence at 2.42 eV. In contrast, room-temperature PL data for the ZnO NWs deposited using (3) is dominated by deep centre, defect-related emission at 2.42 eV. Auger electron spectroscopy (AES) shows that the ZnO films deposited from (1) and (2) are high purity with no detectable carbon, but the ZnO films grown from (3) are contaminated with sulfur (1 at.-%). Single-crystal X-ray structures show that (1) is polymeric containing bridging 1,4-dioxane ligands while (2)

Synthesis, Characterization, and Applications of ZnO Nanowires

“…Generally, the vapor phase synthesis process is carried out at higher temperatures from 500 • C to 1500 • C and produces high-quality nanowires. The typical vapor phase synthesis method includes vapor liquid solid (VLS) growth [47], chemical vapor deposition (CVD) [48], metal organic chemical vapor deposition (MOCVD) [49], physical vapor deposition (PVD) [50], molecular beam epitaxy (MBE) [51], pulsed laser deposition (PLD) [52], and metal organic vapor phase epitaxy (MOVPE) [53]. Among the vapor phase synthesis methods, VLS and MOCVD are two of the most important methods for the ZnO nanowires synthesis.…”

The Solid‐State Structures of Dimethylzinc and Diethylzinc

“…−28 °C, b.p. 118 °C), which are moderately soft Lewis acids that form adducts with a variety of ligands 10. Structural studies of the gas phase have revealed a linear coordination mode 11.…”

Dimethylzinc adduct chemistry revisited: MOCVD of vertically aligned ZnO nanowires using the dimethylzinc 1,4-dioxane adduct

“…4, together with significant bond lengths and angles. Full crystallographic and structural data for [Me 2 Zn(1,4-dioxane)] will be published elsewhere [28]. In the absence of X-ray crystallographic data [Me 2 Zn(1,4-dioxane)] was originally proposed to be a monomeric molecule with a bidentate chelating 1,4-dioxane ligand [22].…”