Zinc blende–wurtzite polytypism in nanocrystalline ZnO films

Aebersold, A. Brian; Fanni, Lorenzo; Hessler-Wyser, Aïcha; Nicolay, Sylvain; Ballif, Christophe; Hébert, C.; Alexander, Duncan T. L.

doi:10.1016/j.actamat.2017.03.021

Cited by 12 publications

(7 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this last case, they can even extend on longer distances (50-60 nm). [36][37][38] The present observation of blende-ZnO crystal located in the middle of polymer interphase, associated with the observation of a weak (200) blende-ZnO XRD peak for all ZnO samples (Figure S1) acts as a proof sustaining the hypothesis of the occurrence of dissolution-precipitation mechanism in CSP. 2.…”

Section: A U T H O R M a N U S C R I P T A U T H O R M A N U S C R I P T A U T H O R M A N U S C R I P Tsupporting

confidence: 81%

Introducing a ZnO–PTFE (Polymer) Nanocomposite Varistor via the Cold Sintering Process

et al. 2018

View full text Add to dashboard Cite

The nanocomposite structure is verified to have polymer intergranular phase in a thickness range from 2 to 5 nm. The electrical characteristics are made to show nonlinear I-V behavior; the barrier-layer effective permittivity is established through an impedance spectroscopy analysis. The activation energies controlling resistance at the grain boundary is determined to range between 0.2 and 0.76 eV with volume fractions between 0 and 40 vol% PTFE. Under high fields and across a broad temperature ranges, the authors quantified of the non-linear conductions with a variety of voltages, the low field higher temperatures are consistent with a Schottky thermionic emission controlled conduction, and Fowler-Nordheim plots shows the current is transitioned to tunneling controlled. The authors also discuss the possibility of designing new types of nanocomposites with the process indicated here, and also having the possibility of taking advantage of interfacial size effects with thin polymer films between ceramic grains.

show abstract

Section: A U T H O R M a N U S C R I P T A U T H O R M A N U S C R I P T A U T H O R M A N U S C R I P Tsupporting

confidence: 81%

Introducing a ZnO–PTFE (Polymer) Nanocomposite Varistor via the Cold Sintering Process

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The high-angle annular dark field (HAADF) scanning transmission electron microscopy (STEM) image and the corresponding elemental maps confirm the existence of the separated Sn and ZnO phases (Figue S2). It is worthwhile to mention that both the OR between crystalline Sn and WZ ZnO and that between ZB and WZ ZnO are consistent with the previous results. , …”

supporting

confidence: 92%

“…15 The seed-catalyzed growth of nanowire (NW) is an ideal system for investigation, whereas multiple (meta)stable phases, such as the wurtzite (WZ) and zinc blende (ZB) structures with a wealth of physical properties can nucleate by simply tuning the growth conditions (sourcematerial flux ratio, catalyst geometry, etc.). 15−17 Nonetheless, unlike other II−VI group compounds, only the WZ phase has been well-documented in ZnO nanostructures during the catalyst-assisted growth processes, although a metastable ZB structure was reported in ZnO thin films fabricated by the oxidation of zinc 18,19 and ZnS, 20 and heteroepitaxial growth on cubic substrates. 21 Because the different stacking sequences in WZ and ZB phases with energy difference of ∼50 meV/ZnO formula unit 18,22 can lead to quite distinct band structures and thus optical and electronic properties, 23−25 the lack of the ZB-phase availability in onedimensional ZnO may post a limit for a wider engineering applications, which again requires a better understanding of the physics behind the catalyst-assist growth kinetics.…”

mentioning

confidence: 99%

Atomistic Interface Dynamics in Sn-Catalyzed Growth of Wurtzite and Zinc-Blende ZnO Nanowires

Jia

et al. 2018

Nano Lett.

View full text Add to dashboard Cite

Unraveling the phase selection mechanisms of semiconductor nanowires (NWs) is critical for the applications in future advanced nanodevices. In this study, the atomistic vapor-solid-liquid growth processes of Sn-catalyzed wurtzite (WZ) and zinc blende (ZB) ZnO are directly revealed based on the in situ transmission electron microscopy. The growth kinetics of WZ and ZB crystal phases in ZnO appear markedly different in terms of the NW-droplet interface, whereas the nucleation site as determined by the contact angle ϕ between the seed particle and the NW is found to be crucial for tuning the NW structure through combined experimental and theoretical investigations. These results offer an atomic-scale view into the dynamic growth process of ZnO NW, which has implications for the phase-controllable synthesis of II-VI compounds and heterostructures with tunable band structures.

show abstract

“…Recently, numbers of experimental and theoretical efforts have been made to identify interface effects for SLs ,, , . By varying the ratio of ZB or WZ phases in ZB/WZ‐GaAs interface, a sharp photoluminescence peak was observed to shift from 1.515 down to 1.43 eV, as reported by Spirkoska et al .…”

Section: Introductionmentioning

confidence: 56%

Structural Engineering of Zinc‐Blend/Wurtzite BN Superlattices

et al. 2018

View full text Add to dashboard Cite

By constructing Zinc-Blende (ZB)/Wurtzite (WZ) boron nitride (BN) (ZB 1-x /WZ x -BN) superlattices (SLs), their electronic structure and mechanical properties were investigated by first-principles techniques based on density functional theory. It is found that the band structure is significantly modulated by the ratio of WZ phase in ZB/WZ-BN SLs. With the increase of WZ ratio, the band gap of SLs decreases and then increases dramatically. More importantly, transformation from type-I to type-II band alignment between ZB and WZ can be tuned by adjusting the ratio of WZ to be > 0.6. In addition, a universal expression of the band gap is proposed to reveal a nonlinear dependence of the band gap within the structure of SLs as induced by from the interface effect achieved via structural transformation. The elastic constants results revealed that the change of ZB/WZ ratio poses no significant effect on the mechanical properties. The effect of structure modulation on band structure and mechanical properties is significantly important for future engineering of novel semiconductor SLs.

show abstract

Zinc blende–wurtzite polytypism in nanocrystalline ZnO films

Cited by 12 publications

References 48 publications

Introducing a ZnO–PTFE (Polymer) Nanocomposite Varistor via the Cold Sintering Process

Introducing a ZnO–PTFE (Polymer) Nanocomposite Varistor via the Cold Sintering Process

Atomistic Interface Dynamics in Sn-Catalyzed Growth of Wurtzite and Zinc-Blende ZnO Nanowires

Structural Engineering of Zinc‐Blend/Wurtzite BN Superlattices

Contact Info

Product

Resources

About