2H/1T′ phase WS2(1−x)Te2x alloys grown by chemical vapor deposition with tunable band structures

Wang, Zhan; Sun, Jing; Wang, Haolin; Lei, Yimin; Xie, Yong; Wang, Guanfei; Zhao, Ying; Li, Xiaobo; Xu, Hua; Yang, Xiaorong; Feng, Li; Ma, Xiaohua

doi:10.1016/j.apsusc.2019.144371

Cited by 18 publications

(23 citation statements)

References 63 publications

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“… Bandgap (eV) Semiconductor Type Synthesis Method Ref. MoS 2(1-x) Se 2x 0-1 atomic % 1.5–1.8 p-type CVD ( Yao et al., 2020 ; Dong et al., 2019 ) Mo (1-x) W x S 2 0-1 atomic % 1.8–2.01 – – ( Dong et al., 2019 ) Mo (1-x) W x Se 2 0-1 atomic % 1.5–1.7 – – ( Dong et al., 2019 ) WS 2(1-x) Se 2x 0-1 atomic % 1.7–2.01 – – ( Dong et al., 2019 ) WS 2x Se 2(1-x) 0.48 atomic % 3.5–3.9 p-type CVD ( Ko et al., 2018 ) WS 2(1-x) Te 2x ( 2H ) <0.5 atomic % 1.97–1.67 p-type CVD ( Wang et al., 2020d ) WS 2(1-x) Te 2x ( 1T ′) ≥0.5 atomic % 0 n-type CVD ( Wang et al., 2020d ) Mo x Re (1-x) S 2 ( 2H ) <0.3 atomic % – n-type CVD ( Deng et al., 2020 ) Mo x Re (1-x) S 2 ( 1T ′) ≥0.3 atomic % – p-type CVD ( Deng et al., 2020 ) …”

Section: Resultsmentioning

confidence: 99%

“…The insert shows the TEM-EDX survey spectrum—element mappings of W, S, and Te from WS 1.66 Te 0.34 . (ii-iii) HAADF-STEM images of monolayer 2H WS 1.66 Te 0.34 and 1T′ phase WS 0.92 Te 1.08 alloys ( Wang et al., 2020d ). (D) Schematic of synthesis method of TMDCs alloy (E) MoS 2(1-x) Se 2x Band energies at x ¼ 0, 0.20, 0.37, 0.55, and 1 ( Yao et al., 2020 ).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Less than 0.5 atomic % of doping, material reported as p-type semiconductor while more significant than 0.5 atomic % resulted in n-type ( Figure 3 C). The root cause of the phase transition behavior is mainly attributed to the nature of Te for stronger metallicity and higher melting point ( Wang et al., 2020d ). Similar phenomena can be observed as bipolar behavior when alloyed in the metal site of 2D TMDC for Mo x Re (1-x) S 2 ( Deng et al., 2020 ).…”

Section: Resultsmentioning

confidence: 99%

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Review of strategies toward the development of alloy two-dimensional (2D) transition metal dichalcogenides

et al. 2021

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Summary Atomically thin two-dimensional (2D) transition metal dichalcogenides (TMDCs) have attracted significant attention owing to their prosperity in material research. The inimitable features of TMDCs triggered the emerging applications in diverse areas. In this review, we focus on the tailored and engineering of the crystal lattice of TMDCs that finally enhance the efficiency of the material properties. We highlight several preparation techniques and recent advancements in compositional engineering of TMDCs structure. We summarize different approaches for TMDCs such as doping and alloying with different materials, alloying with other 2D metals, and scrutinize the technological potential of these methods. Beyond that, we also highlight the recent significant advancement in preparing 2D quasicrystals and alloying the 2D TMDCs with MAX phases. Finally, we highlight the future perspectives for crystal engineering in TMDC materials for structure stability, machine learning concept marge with materials, and their emerging applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Review of strategies toward the development of alloy two-dimensional (2D) transition metal dichalcogenides

et al. 2021

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“…WS 2(1− x ) Te 2 x alloys were prepared by H 2 flow‐controlled CVD method with the assistance of NaCl as catalyst to facilitate the reaction. [ 74 ] By altering the H 2 flow into the reactor, the composition of the alloys was modulated. With a H 2 gas flow of 0–6 sccm the final phase of the alloys was determined as 2H with x ≤ 0.5, and when the flow was increased up to 9–12 sccm 1T′ phase was obtained with x ≥ 0.5.…”

Section: Approaches For 2d Tmd Phase Engineering By Cvdmentioning

confidence: 99%

Chemical Vapor Deposition Mediated Phase Engineering for 2D Transition Metal Dichalcogenides: Strategies and Applications

et al. 2021

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2D transition metal dichalcogenides (TMDs) are characterized by the presence of multiple crystal structures or phases, even at the ultrathin limit. Controlling phase transformations, namely, phase engineering, of 2D TMDs is crucial for realizing high‐performance 2D devices by combining phases with distinct physical and chemical properties. As a powerful approach for large‐scale production of high‐quality 2D TMDs, chemical vapor deposition (CVD) offers unique advantages in phase engineering due to its highly controllable synthesis processes. Starting with an introduction of the crystal structures and phase transformations of 2D TMDs, this review summarizes the recent developments in CVD‐mediated phase engineering strategies of TMDs, including control of temperature, precursors, catalysis, atmosphere, composition, and strain during the deposition process. Moreover, the representative applications of CVD‐based phase‐engineered TMDs in the field of transistors, photodetectors, photovoltaic cells, and catalysis are overviewed. Finally, the challenges, expectations of CVD‐based phase engineering, and future development of this versatile technique are discussed.

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2D Layered Material Alloys: Synthesis and Application in Electronic and Optoelectronic Devices

Yao

Yang

2021

Advanced Science

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2D layered materials (2DLMs) have come under the limelight of scientific and engineering research and broke new ground across a broad range of disciplines in the past decade. Nevertheless, the members of stoichiometric 2DLMs are relatively limited. This renders them incompetent to fulfill the multitudinous scenarios across the breadth of electronic and optoelectronic applications since the characteristics exhibited by a specific material are relatively monotonous and limited. Inspiringly, alloying of 2DLMs can markedly broaden the 2D family through composition modulation and it has ushered a whole new research domain: 2DLM alloy nano-electronics and nano-optoelectronics. This review begins with a comprehensive survey on synthetic technologies for the production of 2DLM alloys, which include chemical vapor transport, chemical vapor deposition, pulsed-laser deposition, and molecular beam epitaxy, spanning their development, as well as, advantages and disadvantages. Then, the up-to-date advances of 2DLM alloys in electronic devices are summarized. Subsequently, the up-to-date advances of 2DLM alloys in optoelectronic devices are summarized. In the end, the ongoing challenges of this emerging field are highlighted and the future opportunities are envisioned, which aim to navigate the coming exploration and fully exert the pivotal role of 2DLMs toward the next generation of electronic and optoelectronic devices.

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2H/1T′ phase WS2(1−x)Te2x alloys grown by chemical vapor deposition with tunable band structures

Cited by 18 publications

References 63 publications

Review of strategies toward the development of alloy two-dimensional (2D) transition metal dichalcogenides

Review of strategies toward the development of alloy two-dimensional (2D) transition metal dichalcogenides

Chemical Vapor Deposition Mediated Phase Engineering for 2D Transition Metal Dichalcogenides: Strategies and Applications

2D Layered Material Alloys: Synthesis and Application in Electronic and Optoelectronic Devices

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