Phonon and thermal properties of exfoliated TaSe2 thin films

Yan, Zheng-Hua; Jiang, Chenglong; Pope, Timothy R.; Tsang, Chu F.; Stickney, John L.; Goli, Pradyumna; Renteria, J.; Salguero, Tina T.; Balandin, Alexander A.

doi:10.1063/1.4833250

Cited by 83 publications

(77 citation statements)

References 39 publications

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“…Deposition of products in the form of single crystals is driven by a temperature gradient between the source and the growth regions [49]. Bulk CDW materials such as 1T-VSe2 [50], 1T-TaSe2 [28], 2H-TaSe2 [5,51] and 2H-NbSe2 [52] have been reported by the CVT method in recent years. For synthesis of 2D CDW materials, recently, J. Wang et al reported controlled synthesis of two-dimensional 1T-TiSe2 on sapphire substrates with sub-10-nm thickness [53] (Figure 5).…”

Section: Chemical Vapor Transportmentioning

confidence: 99%

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

et al. 2017

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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.

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Section: Chemical Vapor Transportmentioning

confidence: 99%

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

et al. 2017

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“…Recent advances in the exfoliation and growth of quasi two-dimensional (2D) layered materialsreferred to as van der Waals materials -have resulted in a surge of interest to their possible device applications [5][6][7][8]. One of the most promising materials among the layered transitionmetal dichalcogenides (TMD) is MoS 2 [9][10].…”

Section: Introductionmentioning

confidence: 99%

High-temperature performance of MoS2 thin-film transistors: Direct current and pulse current-voltage characteristics

Jiang

Rumyantsev²,

Samnakay³

et al. 2015

Journal of Applied Physics

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The measurements of the high-temperature current-voltage characteristics of MoS 2 thinfilm transistors show that the devices remain functional to temperatures of at least as high as 500 K. The temperature increase results in decreased threshold voltage and mobility.The comparison of the DC and pulse measurements shows that the DC sub-linear and super-linear output characteristics of MoS 2 thin-films devices result from the Joule heating and the interplay of the threshold voltage and mobility temperature dependences. At temperatures above 450 K, an intriguing phenomenon of the "memory step" -a kink in the drain current -occurs at zero gate voltage irrespective of the threshold voltage value. The memory step effect was attributed to the slow relaxation processes in thin films similar to those in graphene and electron glasses. The obtained results suggest new applications for MoS 2 thin-film transistors in extreme-temperature electronics and sensors.

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“…In addition to the above properties, S and F dopants are being explored to make graphene magnetic [10,[52][53][54][55], while N dopants are expected to provide much higher enhancements in quantum capacitance without compromising electrical conductivity [28]. Similar to Bi 2 Te 3 , defects in other layered systems such as SnSe and TaSe 2 could be engineered to achieve better thermoelectric performance [56][57][58][59][60][61][62]. Although this chapter presented only some examples of defects in 2D materials, the same concepts also hold true for other 2D materials such as MoS 2 , WS 2 , and BN.…”

Section: Discussionmentioning

confidence: 99%

Defect Engineered 2D Materials for Energy Applications

Mallineni¹,

Bhattacharya²,

Liu³

et al. 2016

Two-Dimensional Materials - Synthesis, Characterization and Potential Applications

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Two-dimensional (2D) materials display unique properties that could be useful for many applications ranging from electronics and optoelectronics to catalysis and energy storage. Entropically necessary defects are inevitably present in 2D materials in the form of vacancies and grain boundaries. Additional defects, such as dopants, may be intentionally introduced to tune the electronic structure of 2D materials. While defects are often perceived as performance limiters, the presence of defects and dopants in 2D materials results in new electronic states to endow unique functionalities that are otherwise not possible in the bulk. In this chapter, we review defect-induced phenomena in 2D materials with some examples demonstrating the relevance of defects in electronic and energy applications. In particular, we present how the (i) N-dopant configuration in graphene changes the electron-phonon interactions, (ii) zigzag defects and edges in graphene increase the quantum capacitance to improve energy density of graphene-based supercapacitors, and (iii) charged grain boundaries in exfoliated Bi 2 Te 3 preferentially scatter low-energy electrons and holes to enhance the thermoelectric performance.

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Phonon and thermal properties of exfoliated TaSe2 thin films

Cited by 83 publications

References 39 publications

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

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

High-temperature performance of MoS2 thin-film transistors: Direct current and pulse current-voltage characteristics

Defect Engineered 2D Materials for Energy Applications

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