Electrical properties of α- and β-MoTe2 as affected by stoichiometry and preparation temperature

Revolinsky, E.; Beerntsen, D. J.

doi:10.1016/0022-3697(66)90195-8

Cited by 37 publications

(21 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hightemperature phases of the alloys were preserved by quenching of the growth ampoules in an ice-water bath. This process is known to prevent reversal of the 1T′ phase to the 2H phase, which is thermodynamically stable in MoTe 2 under ambient conditions [43]. Notably, XRD θ-2θ scans from the as-grown, un-milled − Mo 1 x W x Te 2 flakes produce only 00l-type reflections and miss all asymmetric reflections, thus limiting the ability to reliably determine phase composition in the alloys.…”

Section: Introductionmentioning

confidence: 99%

The structural phases and vibrational properties of Mo _1−x W _x Te ₂ alloys

Oliver¹,

Beams²,

Krylyuk³

et al. 2017

2D Mater.

View full text Add to dashboard Cite

The structural polymorphism in transition metal dichalcogenides (TMDs) provides exciting opportunities for developing advanced electronics. For example, MoTe 2 crystallizes in the 2H semiconducting phase at ambient temperature and pressure, but transitions into the 1T′ semimetallic phase at high temperatures. Alloying MoTe 2 with WTe 2 reduces the energy barrier between these two phases, while also allowing access to the T d Weyl semimetal phase. The −RECEIVED

show abstract

Section: Introductionmentioning

confidence: 99%

The structural phases and vibrational properties of Mo _1−x W _x Te ₂ alloys

Oliver¹,

Beams²,

Krylyuk³

et al. 2017

2D Mater.

View full text Add to dashboard Cite

show abstract

“…MoTe2 is an exfoliable transition metal dichalcogenide (TMD) which crystallizes in three symmetries; the semiconducting trigonal-prismatic 2H−phase, the semimetallic 1T ′ monoclinic phase, and the semimetallic orthorhombic T d structure [1][2][3][4] . The 2H−phase displays a band gap of ∼ 1 eV 5 making it appealing for flexible and transparent optoelectronics.…”

mentioning

confidence: 99%

Engineering the Structural and Electronic Phases of MoTe₂ through W Substitution

et al. 2017

View full text Add to dashboard Cite

MoTe2 is an exfoliable transition metal dichalcogenide (TMD) which crystallizes in three symmetries; the semiconducting trigonal-prismatic 2H−phase, the semimetallic 1T ′ monoclinic phase, and the semimetallic orthorhombic T d structure 1-4 . The 2H−phase displays a band gap of ∼ 1 eV 5 making it appealing for flexible and transparent optoelectronics. The T d−phase is predicted to possess unique topological properties 6-9 which might lead to topologically protected non-dissipative transport channels 9 . Recently, it was argued that it is possible to locally induce phasetransformations in TMDs 3,10,11,14 , through chemical doping 12 , local heating 13 , or electric-field 14,15 to achieve ohmic contacts or to induce useful functionalities such as electronic phase-change memory elements 11 . The combination of semiconducting and topological elements based upon the same compound, might produce a new generation of high performance, low dissipation optoelectronic elements. Here, we show that it is possible to engineer the phases of MoTe2 through W substitution by unveiling the phase-diagram of the Mo1−xWxTe2 solid solution which displays a semiconducting to semimetallic transition as a function of x. We find that only ∼ 8 % of W stabilizes the T d−phase at room temperature. Photoemission spectroscopy, indicates that this phase possesses a Fermi surface akin to that of WTe2 16 .The properties of semiconducting and of semimetallic MoTe 2 are of fundamental interest in their own right, but are also for their potential technological relevance. In the mono-or few-layer limit it is a direct-gap semiconductor, while the bulk has an indirect bandgap 5,17,18 of ∼ 1 eV. The size of the gap is similar to that of Si, making 2H−MoTe 2 particularly appealing for both purely electronic devices 19,20 and optoelectronic applications 21 . Moreover, the existence of different phases opens up the possibility for many novel devices and architectures. For example, controlled conversion of the 1T ′ −MoTe 2 phase to the 2H−phase, as recently reported 22 , could

show abstract

“…Figure a shows the phase diagram of the Mo–Te system. There are two layered phases, room‐temperature stable α‐MoTe 2 (P6 3 / mmc ) and high‐temperature metastable β‐MoTe 2 (P2 1 / m ) . Figure b illustrates the CVT process for synthesis of single crystal MoTe 2 .…”

Section: Preparationmentioning

confidence: 99%

Van der Waals 2D Transition Metal Tellurides

Liu

Wang

et al. 2019

Adv Materials Inter

View full text Add to dashboard Cite

As important members of transition metal chalcogenides (TMCs), transition metal tellurides (TMTs) have drawn much attention for their various crystal structures with various physical properties. These various structures and structural transitions between them not only are fascinating in the fundamental studies, but also provide unprecedented opportunities in novel device design and applications. In this review, the recent developments in the area of TMTs are outlined. First, the unique crystal and electronic structures of TMTs are introduced. Then the TMTs preparation strategies, including novel exfoliation technique and chemical vapor deposition (CVD), are reviewed. Moreover, the distinctive physical properties of TMTs such as phase transition, intrinsic ferromagnetism, and superconductivity are summarized. Additionally, an overview of device applications in the electronics and optoelectronics field is provided. The prospect for the research of TMTs is presented at the end.

show abstract

Electrical properties of α- and β-MoTe2 as affected by stoichiometry and preparation temperature

Cited by 37 publications

References 9 publications

The structural phases and vibrational properties of Mo _1−x W _x Te ₂ alloys

The structural phases and vibrational properties of Mo _1−x W _x Te ₂ alloys

Engineering the Structural and Electronic Phases of MoTe₂ through W Substitution

Van der Waals 2D Transition Metal Tellurides

Contact Info

Product

Resources

About

Electrical properties of α- and β-MoTe2 as affected by stoichiometry and preparation temperature

Cited by 37 publications

References 9 publications

The structural phases and vibrational properties of Mo 1−x W x Te 2 alloys

The structural phases and vibrational properties of Mo 1−x W x Te 2 alloys

Engineering the Structural and Electronic Phases of MoTe2 through W Substitution

Van der Waals 2D Transition Metal Tellurides

Contact Info

Product

Resources

About

The structural phases and vibrational properties of Mo _1−x W _x Te ₂ alloys

The structural phases and vibrational properties of Mo _1−x W _x Te ₂ alloys

Engineering the Structural and Electronic Phases of MoTe₂ through W Substitution