Growth of Bi2Te3 films and other phases of Bi-Te system by MOVPE

Кузнецов, П. И.; Yapaskurt, V.O.; Shchamkhalova, B.S.; Щербаков, В. П.; Yakushcheva, G. G.; Luzanov, V. A.; Jitov, V.A.

doi:10.1016/j.jcrysgro.2016.09.055

Cited by 30 publications

(25 citation statements)

References 24 publications

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“…Synthetic compounds derived from tetradymite have also attracted attention from materials science researchers, due to characteristics that enable their use as thermoelectric devices and topological insulators ( [9,10], and references therein). Like named minerals and other natural phases, synthetic products in the system Bi-Te (e.g., [11][12][13]) can also be interpreted in terms of different combinations and proportions of layers. This homology thus allows the derivation of a systematic group homology [1,2] and implies that each individual member of the series should be stoichiometric in composition.…”

Section: Introductionmentioning

confidence: 99%

The Mixed-Layer Structures of Ikunolite, Laitakarite, Joséite-B and Joséite-A

et al. 2021

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We used high-angle annular dark field scanning transmission electron microscopy (HAADF STEM) to image the crystal structures of four minerals in the Bi4X3 isoseries (X = Te, Se, S), a subgroup of the tetradymite homologous series: ikunolite (Bi4S3), laitakarite (Bi4Se2S), joséite-B (Bi4Te2S), and joséite-A (Bi4TeS2). The four minerals are isostructural and interpretable in terms of regular stacking of seven-atom packages: [Bi–S–Bi–S–Bi–S–Bi], [Bi–Se–Bi–S–Bi–Se–Bi], [Bi–Te–Bi–S–Bi–Te–Bi], and [Bi–S–Bi–Te–Bi–S–Bi], respectively. The four phases are mixed-layer structures representing the Bi2kTe3 (k = 2) module within the tetradymite series. Diffraction patterns confirm they are seven-fold superstructures of a rhombohedral subcell with c/3 = d~1.89–1.93 Å. Modulation along the d* interval matches calculations of reflection intensity using the fractional shift method for Bi4X3. Internal structures can be discerned by high-resolution HAADF STEM imaging and mapping. Paired bismuth atoms are positioned at the outside of each seven-atom layer, giving the minerals a modular structure that can also be considered as being composed of five-atom (X–Bi–X–Bi–X) and two-atom (Bi–Bi) sub-modules. The presence of mixed sites for substituting cations is shown, particularly for Pb. Moreover, Pb may be important in understanding the incorporation of Ag and Au in Bi–chalcogenides. Visualisation of crystal structures by HAADF STEM contributes to understanding relationships between phases in the tetradymite homologous series and will play an invaluable role in the characterization of potential additional members of the series.

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Section: Introductionmentioning

confidence: 99%

The Mixed-Layer Structures of Ikunolite, Laitakarite, Joséite-B and Joséite-A

et al. 2021

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“…Therefore, to form thin continuous films, it is necessary to neutralize the free bonds on the substrate surface. For this, a number of approaches are used; in particular, a two-stage process of low-temperature nucleation [19] and deposition of buffer layers of various selenides, including ZnSe [17] and ZnTe [18]. As we noted above in Section 2, the low temperature MOCVD deposition of Bi 2 Se 3 and Bi 2 Te 3 films leads to the formation of numerous phases with other stoichiometries.…”

Section: Deposition Of Bi 2 Te 3 and Bi 2 Se 3 Films On The Chemical mentioning

confidence: 99%

MOCVD deposition of zinc and bismuth chalcogenides films on the surface of silica optical fibres

Кузнецов¹,

Yakushcheva²,

Savelyev³

et al. 2020

physics

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Metal organic chemical vapour deposition (MOCVD) technology is adapted for the deposition of thin zinc and bismuth chalcogenides films on the surface of silica optical fibres with short tapered sections. Growth runs were carried out in a special tubular quartz reactor at atmospheric pressure of hydrogen at 425°C temperature using ZnEt2, BiMe3, Et2Te and i-Pro2Se as organometallic precursors. During the deposition of chalcogenides, the transmittance spectra of the fibre were recorded in regular short time intervals. In the transmittance spectra of the fibre with a tapered section coated by ZnSe and ZnTe, lossy mode resonances (LMR) were observed at a diameter of the tapered waist below 30 μm. After the deposition of very thin Bi2Te3 and Bi2Se3 island films on the tapered waist with a diameter about 10 μm optical fibres were built into erbium fibre ring lasers. A pulsed generation mode was achieved in some of lasers due to resonator Q-factor modulation. These results can be applied for the design of LMR fibre sensors and passively Q-switch pulsed fibre lasers.

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“…The formation of crystalline, phase-pure Bi2Te3 films at low substrate temperature is remarkable. A very recent study on the growth of bismuth telluride thin films by a classical two-precursors depends on the substrate temperature and the precursor stoichiometry [37] . The lowest substrate temperature, at which Bi2Te3 film growth was observed, was 330 °C.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Low-temperature MOCVD deposition of Bi 2 Te 3 thin films using Et 2 BiTeEt as single source precursor

Bendt

Gassa

Jooß

et al. 2018

Journal of Crystal Growth

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Et2BiTeEt was used as single source precursor for the deposition of Bi2Te3 thin films on Si(100) substrates by metal organic chemical vapor deposition (MOCVD) at very low substrate temperatures. Stoichiometric and crystalline Bi2Te3 films were grown at 230 °C, which is approximately 100 °C lower compared to conventional MOCVD processes using one metal organic precursors for each element. The Bi2Te3 films were characterized using scanning electron microscopy, high-resolution transmission electron microscopy and X-ray diffraction. The elemental composition of the films, which was determined by energy-dispersive X-ray spectroscopy and Xray photoelectron spectroscopy, was found to be strongly dependent of the substrate temperature.

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Growth of Bi2Te3 films and other phases of Bi-Te system by MOVPE

Cited by 30 publications

References 24 publications

The Mixed-Layer Structures of Ikunolite, Laitakarite, Joséite-B and Joséite-A

The Mixed-Layer Structures of Ikunolite, Laitakarite, Joséite-B and Joséite-A

MOCVD deposition of zinc and bismuth chalcogenides films on the surface of silica optical fibres

Low-temperature MOCVD deposition of Bi 2 Te 3 thin films using Et 2 BiTeEt as single source precursor

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