Controlled Synthesis of Atomically Thin 1T-TaS<sub>2</sub> for Tunable Charge Density Wave Phase Transitions

Fu, Wei; Yu, Changlin; Lin, Junhao; Wang, Xuewen; Zeng, Qingsheng; Zhou, Jiadong; Zheng, Lianxi; Wang, Hong; He, Yongmin; He, Haibing; Fu, Qundong; Suenaga, Kazu; Yu, Ting; Liu, Zheng

doi:10.1021/acs.chemmater.6b02334

Cited by 83 publications

(79 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Chemical vapor deposition (CVD), chemical vapor transport (CVT), and MBE have been successfully used to synthesize CDW or SC transition metal dichalcogenide monolayers and few‐layers ( Figure ), including TiSe 2 , TaS 2 , TaSe 2 , NbSe 2 , NbS 2 , and so on. For example, Liu and co‐workers have reported CVD synthesis of 2 H ‐NbSe 2 monolayer with robust SC ( T SC ≈ 0.8 K) .…”

Section: Recent Progress On the Synthesis Of 2d Phase‐transition Matementioning

confidence: 99%

Potential 2D Materials with Phase Transitions: Structure, Synthesis, and Device Applications

et al. 2018

View full text Add to dashboard Cite

bandgap can overcome the short channel effect, and then can scale down transistors to sub-10 nm [13,14] and even sub-5 nm [10,[15][16][17][18] to extend the Moore's law. Over last decades, typical 2D semiconductors, such as MoS 2 and WSe 2 , have been intensively studied. [19][20][21][22] On the other hand, 2D materials with versatile phase-transition properties offer new opportunities in both fundamental research and future device applications. In the last few years, a lot of exciting experiments have been conducted on this subfamily of 2D materials in the monolayer limit, such as charge density wave (CDW) 1T-TaS 2 , [23][24][25][26] superconducting (SC) 2H-NbSe 2 , [27][28][29] ferromagnetic (FM) CrI 3 , [12,30,31] and Cr 2 Ge 2 Te 6 . [11,32] CDW is a phenomenon of forming a standing-wave-like electron density usually accompanied with a lattice distortion and a bandgap opening due to electronphonon interaction. [33] SC is a phenomenon of zero electrical resistance and expulsion of magnetic flux fields also originated from electron-phonon interaction. [34] Magnetism and electric polarization stem from spontaneous spin/dipole ordering, respectively. [35,36] Parallel and antiparallel spins constitute long-range ferromagnetic (FM) and antiferromagnetic (AFM) ordering, respectively. Similarly, parallel and antiparallel dipoles form ferroelectric (FE) and antiferroelectric (AFE) ordering, respectively. Van der Waals layered materials can show a lot of novel properties, especially in the atomic thickness limit. This includes the follow ing terms: (1) The odd/even layer effect may emerge due to weak interlayer coupling. For example, FM or FE ordering may appear in the odd layers, while AFM or AFE ordering may appear in the even layers; (2) Due to confinement effect in the out-of-plane direction, new ordering structures may appear;(3) The properties can be easily tuned by strain, external fields, interface interaction, and so on. Toward fundamental property measurement and device applications, the challenge remains, such as predicting/discovering new 2D phase-transition materials, controlling the chemical synthesis, overcoming the poor air stability, and so on. Here, a literature survey has been carried out to search possible 2D phase-transition materials. Recent progress on the chemical synthesis and property investigation of some obtained monolayers has been reviewed, including CDW 1T-TaS 2 monolayers, FM CrI 3 mono layers, and so on.Layered materials with phase transitions, such as charge density wave (CDW) and magnetic and dipole ordering, have potential to be exfoliated into monolayers and few-layers and then become a large and important subfamily of two-dimensional (2D) materials. Benefitting from enriched physical properties from the collective interactions, long-range ordering, and related phase transitions, as well as the atomic thickness yet having nondangling bonds on the surface, 2D phase-transition materials have vast potential for use in new-concept and functional devices. Here, potential 2D phase-transit...

show abstract

Section: Recent Progress On the Synthesis Of 2d Phase‐transition Matementioning

confidence: 99%

Potential 2D Materials with Phase Transitions: Structure, Synthesis, and Device Applications

et al. 2018

View full text Add to dashboard Cite

show abstract

“…CVD involves chemical reactions of gaseous reactants on a heated substrate surface [54,55]. The CVD approach has been used successfully in synthesizing 1T-VS 2 [56,57], 1T-VSe 2 [58,59], 2H-NbS 2 [60], 3R-NbS 2 [60], 2H-NbSe 2 [61], 1T-TaS 2 [62,63], 1T-TiSe 2 [64], and so on. Contamination-free and high crystalline quality samples with potential for scaling-up are the great advantages of the CVD method [65].…”

Section: Chemical Vapor Depositionmentioning

confidence: 99%

“…Later, W. Fu et al reported the controlled synthesis of atomically-thin 1T-TaS 2 [62] ( Figure 6). The tantalum pentachloride (TaCl 5 ) and sulfur (S) powder were used as precursors.…”

Section: Chemical Vapor Depositionmentioning

confidence: 99%

Recent Advances in Two-Dimensional Materials with Charge Density Waves: Synthesis, Characterization and Applications

et al. 2017

View full text Add to dashboard Cite

Abstract:Recently, two-dimensional (2D) charge density wave (CDW) materials have attracted extensive interest due to potential applications as high performance functional nanomaterials. As other 2D materials, 2D CDW materials are layered materials with strong in-plane bonding and weak out-of-plane interactions enabling exfoliation into layers of single unit cell thickness. Although bulk CDW materials have been studied for decades, recent developments in nanoscale characterization and device fabrication have opened up new opportunities allowing applications such as oscillators, electrodes in supercapacitors, energy storage and conversion, sensors and spinelectronic devices. In this review, we first outline the synthesis techniques of 2D CDW materials including mechanical exfoliation, liquid exfoliation, chemical vapor transport (CVT), chemical vapor deposition (CVD), molecular beam epitaxy (MBE) and electrochemical exfoliation. Then, the characterization procedure of the 2D CDW materials such as temperature-dependent Raman spectroscopy, temperature-dependent resistivity, magnetic susceptibility and scanning tunneling microscopy (STM) are reviewed. Finally, applications of 2D CDW materials are reviewed.

show abstract

“…With increasing interest in studying monolayer or fewlayer charge density wave TMDs, the bottom-up approach of growth by molecular beam epitaxy (MBE) [13,19] or chemical vapour deposition (CVD) [15,16] techniques has become common. Once optimized, these methods are excellent at producing thin films.…”

Section: Introductionmentioning

confidence: 99%

Correlation between crystal purity and the charge density wave in 1T−VSe2

Sayers

Farrar

Bending

et al. 2020

Phys. Rev. Materials

View full text Add to dashboard Cite

We examine the charge density wave (CDW) properties of 1T -VSe2 crystals grown by chemical vapour transport (CVT) under varying conditions. Specifically, we find that by lowering the growth temperature (T g < 630 • C), there is a significant increase in both the CDW transition temperature and the residual resistance ratio (RRR) obtained from electrical transport measurements. Using xray photoelectron spectroscopy (XPS), we correlate the observed CDW properties with stoichiometry and the nature of defects. In addition, we have optimized a method to grow ultra-high purity 1T -VSe2 crystals with a CDW transition temperature, TCDW = (112.7 ± 0.8) K and maximum residual resistance ratio (RRR) ≈ 49, which is the highest reported thus far. This work highlights the sensitivity of the CDW in 1T -VSe2 to defects and overall stoichiometry, and the importance of controlling the crystal growth conditions of strongly-correlated transition metal dichalcogenides.

show abstract

Controlled Synthesis of Atomically Thin 1T-TaS₂ for Tunable Charge Density Wave Phase Transitions

Cited by 83 publications

References 38 publications

Potential 2D Materials with Phase Transitions: Structure, Synthesis, and Device Applications

Potential 2D Materials with Phase Transitions: Structure, Synthesis, and Device Applications

Recent Advances in Two-Dimensional Materials with Charge Density Waves: Synthesis, Characterization and Applications

Correlation between crystal purity and the charge density wave in 1T−VSe2

Contact Info

Product

Resources

About

Controlled Synthesis of Atomically Thin 1T-TaS2 for Tunable Charge Density Wave Phase Transitions

Cited by 83 publications

References 38 publications

Potential 2D Materials with Phase Transitions: Structure, Synthesis, and Device Applications

Potential 2D Materials with Phase Transitions: Structure, Synthesis, and Device Applications

Recent Advances in Two-Dimensional Materials with Charge Density Waves: Synthesis, Characterization and Applications

Correlation between crystal purity and the charge density wave in 1T−VSe2

Contact Info

Product

Resources

About

Controlled Synthesis of Atomically Thin 1T-TaS₂ for Tunable Charge Density Wave Phase Transitions