Stabilization of the rhombohedral polytype in MoS2 and WS2 microtubes: TEM and AFM study

Remškar, Maja; Škraba, Z.; Ballif, Christophe; Sanjinés, R.; Lévy, F.

doi:10.1016/s0039-6028(99)00086-2

Cited by 59 publications

(45 citation statements)

References 16 publications

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“…Its wall consisting of three molecular layers is in agreement with our assumption of the preferential 3R polytypic structure. The indications for the high-pressure 3R polytype, which is stable in plane geometry at pressures above 4 Gpa, [15] but has been found also in large-diameter MoS 2 nanotubes, [16,17] enables an insight into the growth condition in the confined geometry of a MoS 2 nanotube reactor. Resonance Raman spectrum (Fig.…”

Section: By Maja Remškar* Aleš Mrzel Marko Viršek and Adolf Jesihmentioning

confidence: 90%

Inorganic Nanotubes as Nanoreactors: The First MoS₂Nanopods

et al. 2007

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Section: By Maja Remškar* Aleš Mrzel Marko Viršek and Adolf Jesihmentioning

confidence: 90%

Inorganic Nanotubes as Nanoreactors: The First MoS₂Nanopods

et al. 2007

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“…[67] The polytypic stacking of molecular layers in nanotubes with diameters above 2 lm (rhombohedral 3R stacking) was found to differ from that in nanotubes with diameters below 100 nm (hexagonal 2Hb stacking). [68] The selected-area diffraction on the microtube wall revealing the rhombohedral (3R) stacking, otherwise stable at elevated pressure above 4 GPa, provides indirect evidence of the presence of strain incorporated into the microtube wall (Fig. 3).…”

Section: Stacking Order and Helicity In Nanotube Latticesmentioning

confidence: 99%

Inorganic Nanotubes

Remškar¹

2004

Advanced Materials

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Since the first report on the synthesis of inorganic WS2 nanotubes in 1992, the number of articles on the successful growth of different inorganic nanotubes has increased rapidly, emphasizing the importance of this field for nanotechnology. Although there are some geometrical similarities to carbon nanotubes, inorganic nanotubes are distinguished by important peculiarities, from their growth mechanisms to the physical and chemical properties that are attractive for potential applications. Their structural properties, which are important for such applications, are discussed in this review.

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“…Since NiS x is a degenerate semiconductor with almost metal-like conductivity [49], one has to expect that the photovoltaic properties of a heterojunction solar cells with such absorber films are disturbed by these NiS x inclusions, for instance by short circuiting the front and back contacts [50].…”

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Preparation routes based on magnetron sputtering for tungsten disulfide (WS₂) films for thin‐film solar cells

Ellmer

2008

Physica Status Solidi (b)

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The semiconductor tungsten disulfide (WS2) exhibits van der Waals bonding, crystallizes in a layer‐type structure and is of interest as an absorber layer for thin‐film solar cells. In this review article different preparation routes for WS2 thin films, based on magnetron sputtering, are reviewed. Films prepared by direct magnetron sputtering, though exhibiting quite a good structural quality, are not or only poorly photoactive. This can be attributed to the generation of recombination centers, especially sulfur vacancies, during the ion bombardment of the films, due to the low defect‐formation energy of tungsten disulfide, an intrinsic property of transition metal dichalcogenides. A promising preparation route, which leads to photoactive WS2 films, is a two‐step process, where, in a first step, a sulfur‐rich, X‐ray amorphous tungsten sulfide is deposited at low substrate temperatures onto a thin metal film (Ni, Co). This film sandwich is after wards annealed in an ampoule in a sulfur atmosphere or in flowing gas with a sufficient H2S partial pressure. From in‐situ transmission electron microscopy and energy‐dispersive X‐ray diffraction, it was found that the WS2 film crystallization with a pronounced (001) texture is closely related to the formation of the liquid (eutectic) metal–sulfur phase. Based on these in‐situ investigations the growth of the 2‐dimensional WS2 nanosheets from an amorphous WS3+x precursor can be described as an amorphous solid‐liquid‐crystalline solid process (SLS), somewhat similar to the well‐known vapor‐liquid‐solid (VLS) process for the growth of whiskers or nanorods and nanotubes. Research opportunities, to overcome current limitations for a broad use of WS2 (and MoS2) as thin‐film solar cell absorbers are given. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Stabilization of the rhombohedral polytype in MoS2 and WS2 microtubes: TEM and AFM study

Cited by 59 publications

References 16 publications

Inorganic Nanotubes as Nanoreactors: The First MoS₂Nanopods

Inorganic Nanotubes as Nanoreactors: The First MoS₂Nanopods

Inorganic Nanotubes

Preparation routes based on magnetron sputtering for tungsten disulfide (WS₂) films for thin‐film solar cells

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Stabilization of the rhombohedral polytype in MoS2 and WS2 microtubes: TEM and AFM study

Cited by 59 publications

References 16 publications

Inorganic Nanotubes as Nanoreactors: The First MoS2Nanopods

Inorganic Nanotubes as Nanoreactors: The First MoS2Nanopods

Inorganic Nanotubes

Preparation routes based on magnetron sputtering for tungsten disulfide (WS2) films for thin‐film solar cells

Contact Info

Product

Resources

About

Inorganic Nanotubes as Nanoreactors: The First MoS₂Nanopods

Inorganic Nanotubes as Nanoreactors: The First MoS₂Nanopods

Preparation routes based on magnetron sputtering for tungsten disulfide (WS₂) films for thin‐film solar cells