Morphology and growth mechanism of aligned ZnO nanorods grown by catalyst-free MOCVD

Controlling the growth of zinc oxide nanowires is necessary to optimize the performance of nanowire-based devices such as photovoltaic solar cells, nano-generators, or light-emitting diodes. With this in mind, we investigate the nucleation and growth mechanisms of ZnO nanowires grown by metalorganic vapor phase epitaxy either on O-polar ZnO or on sapphire substrates. Whatever the substrate, ZnO nanowires are Zn-polar, as demonstrated by convergent beam electron diffraction. For growth on O-polar ZnO substrate, the nanowires are found to sit on O-polar pyramids. As growth proceeds, the inversion domain boundary moves up in order to remain at the top of the O-polar pyramids. For growth on sapphire substrates, the nanowires may also originate from the sapphire/ZnO interface. The presence of atomic steps and the non-polar character of sapphire could be the cause of the Zn-polar crystal nucleation on sapphire, whereas it is proposed that the segregation of aluminum impurities could account for the nucleation of inverted domains for growth on O-polar ZnO.

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“…The nanowire morphology for the growth on sapphire was described in two previous papers [19,20]. We recall here the main results.…”

Section: Morphology Of the Nanostructuresmentioning

confidence: 89%

“…is an industrially-compatible method which allows making hetero-structures with fast deposition rates and a high reliability, a lot of work has been published concerning the MOVPE growth of ZnO nanowires on sapphire [42,43,44,45,46,47,19,20] since the first publication by G.C. Yi's group [1].…”

Section: Compared Growth Mechanisms Of Zn-polar Zno Nanowires On O-pomentioning

confidence: 99%

Compared growth mechanisms of Zn-polar ZnO nanowires on O-polar ZnO and on sapphire

et al. 2012

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“…Furthermore, ZnO has received much attention because it is easy to fabricate large quantities of high quality ZnO nanowires with diameters of a few hundred nanometers and lengths of several tens of micrometer. ZnO nanowires can be synthesized by numerous methods, such as plasma-assisted molecular beam epitaxy (MBE) [4,5], pulsed laser deposition (PLD) [6,7], metal organic chemical vapor deposition (MOCVD) [8,9], and sol-gel [10,11] methods. However, these techniques always involve expensive equipment, complex procedures.…”

Section: Introductionmentioning

confidence: 99%

Optical waveguide based on ZnO nanowires prepared by a thermal evaporation process

Jiang¹,

Zhao²,

Zhao³

et al. 2012

Journal of Alloys and Compounds

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“…Various vapor-phase processes (for example, vapor-liquid-solid epitaxial (VLSE) growth [10], metal-organic chemical vapor deposition (MOCVD) [11], and thermal evaporation [7,12] have been developed for the synthesis of 1D ZnO arrays. However, expensive and complicated equipments is required in * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

Development of a wet chemical method for the synthesis of arrayed ZnO nanorods

Hu¹,

Chen²,

Hwang³

et al. 2010

Journal of Alloys and Compounds

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Morphology and growth mechanism of aligned ZnO nanorods grown by catalyst-free MOCVD

Cited by 35 publications

References 7 publications

Compared growth mechanisms of Zn-polar ZnO nanowires on O-polar ZnO and on sapphire

Compared growth mechanisms of Zn-polar ZnO nanowires on O-polar ZnO and on sapphire

Optical waveguide based on ZnO nanowires prepared by a thermal evaporation process

Development of a wet chemical method for the synthesis of arrayed ZnO nanorods

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