Polymorph Structures, Rich Physical Properties and Potential Applications of <scp>Two‐Dimensional MoTe2</scp>, <scp>WTe2</scp> and Their Alloys†

Zhou, Rui; Wu, Juanxia; Chen, Yuansha; Xie, Liming

doi:10.1002/cjoc.202100777

Cited by 3 publications

(1 citation statement)

References 170 publications

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“…The layered 1T′-WTe 2 material crystallized into a rhombic structure in the space group Pnm21. Due to its unique band structure, 1T′-WTe 2 is classified as the second type of Weyl semimetal. ,,− Unlike its counterpart material MoTe 2 , WTe 2 has only one phase at ambient condition; thus, the multiphase mixing problem does not apply to WTe 2 , which is advantageous for the sample preparation. Furthermore, WTe 2 devices demonstrate notable stability even on the conditions of high-temperature or intensive light irradiation. , The crystalline WTe 2 devices also display anisotropic photoelectric and broadband optical responses. , Currently, the preparation of WTe 2 devices primarily relies on the mechanical exfoliation of the single crystals grown by the chemical vapor transfer method.…”

Section: Introductionmentioning

confidence: 99%

Self-Powered Broadband Photodetectors Based on Large-Scale Continuous Films of Weyl Semimetal WTe₂

Feng,

Zhang,

Zhang

et al. 2024

ACS Appl. Opt. Mater.

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WTe 2 , as a member of Weyl semimetals, is a promising candidate for next-generation optoelectronic devices with the advantages of high response speed, broadband photoresponse, and low power consumption due to its unique band structure with conduction and valence bands touching at the Weyl nodes. Here, we report on the synthesis of large-scale continuous WTe 2 films and their application in self-powered broadband photodetectors (PDs). The films were synthesized on SiO 2 /Si substrate using a modified chemical vapor deposition method with predeposited precursor particles. The pure 1T′ phase and the structural uniformity of the thin film were confirmed by Raman spectroscopy and energy-dispersive X-ray spectroscopy. PDs with asymmetric metal electrodes of Pd-WTe 2 -Ag structure were designed and fabricated using shadow-mask-assisted ultra-high vacuum deposition method. By measuring the self-powered photocurrent under the illumination of Xe lamp, it is revealed that the device is sensitive to a wide range (λ = 320−1200 nm) of light spectra while maintaining the on/off ratio (∼10 2 ), responsiveness (0.85 mA/ W), and specific detectivity (1.23 × 10 8 Jones). The response time reaches hundreds of milliseconds in different spectral bands. These results provide insights into future application of 1T′-WTe 2 in advanced optoelectronic devices like self-powered broadband PDs.

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Section: Introductionmentioning

confidence: 99%

Self-Powered Broadband Photodetectors Based on Large-Scale Continuous Films of Weyl Semimetal WTe₂

Feng,

Zhang,

Zhang

et al. 2024

ACS Appl. Opt. Mater.

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Vapor‐Phase Precise‐Synthesis of 2D Inorganic Materials for Optoelectronics

et al. 2023

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Comprehensive Summary 2D materials have attracted intensive attention due to their unique electrical and optical properties associated with their strictly defined low dimensionalities. They provide a wide range of basic building blocks for future electronics and optoelectronics. The chemical vapor deposition (CVD) has been proposed to be efficient to realize the controllable thickness, scalable size, which are necessary for both industrial applications and fundamental researches. Herein, we share our research works to realize the controllable growth of 2D materials. We found that stable growth microenvironment can regulate the growth of 2D materials. Thus, we developed near‐steady source supply, space‐confined, and additive‐assisted passivated growth methods to solve the problem of unstable growth environment caused by uneven source and mass transfer. Then, we developed several strategies to precisely control the parity, separation, and transport of the carriers in 2D materials including fabricating defect‐free interface via van der Waals dielectrics, modulating the parity of carriers via ferroelectric‐field, and the separation of carriers via band engineering. Toward future development, we highlight the opportunities and challenges in this field. What is the most favorite and original chemistry developed in your research group? Additive‐assisted passivated chemical vapor deposition for growing 2D materials such as non‐layered 2D materials and 2D inorganic molecular crystals. How do you get into this specific field? Could you please share some experiences with our readers? I got my introduction to chemical vapor deposition for growing nanomaterials from my undergraduate training. Then I focused on transistors and photodetectors during my postgraduate research in Japan. When I came back, I found that 2D materials are promising for the next generation optoelectronics. Thus, I started to get into this field of synthesis of 2D materials for optoelectronics. What is the most important personality for scientific research? Interest, is the driving force to find novel phenomenon, and persist in scientific research. How do you supervise your students? I prefer to discuss different experimental directions according to each student's interests. In terms of topic selection, I will give them more space for thinking and ask them to discuss with me with their problems. Then, we will choose one or more directions that deserve to be focused. I will follow up the details of their experiments every week. In the meantime, I also coach them how to design research projects for their research, and perform multidisciplinary research in collaboration with others. What are your hobbies? Running. If you have anything else to tell our readers, please feel free to do so. As a scientist, please keep interests and curiosity in your scientific research, as well as persistent.

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Electronic states of semiconductor compounds and alloys

Kudrawiec¹

2024

Encyclopedia of Condensed Matter Physics

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Polymorph Structures, Rich Physical Properties and Potential Applications of Two‐Dimensional MoTe₂, WTe₂ and Their Alloys^†

Cited by 3 publications

References 170 publications

Self-Powered Broadband Photodetectors Based on Large-Scale Continuous Films of Weyl Semimetal WTe₂

Self-Powered Broadband Photodetectors Based on Large-Scale Continuous Films of Weyl Semimetal WTe₂

Vapor‐Phase Precise‐Synthesis of 2D Inorganic Materials for Optoelectronics

Electronic states of semiconductor compounds and alloys

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Polymorph Structures, Rich Physical Properties and Potential Applications of Two‐Dimensional MoTe2, WTe2 and Their Alloys†

Cited by 3 publications

References 170 publications

Self-Powered Broadband Photodetectors Based on Large-Scale Continuous Films of Weyl Semimetal WTe2

Self-Powered Broadband Photodetectors Based on Large-Scale Continuous Films of Weyl Semimetal WTe2

Vapor‐Phase Precise‐Synthesis of 2D Inorganic Materials for Optoelectronics

Electronic states of semiconductor compounds and alloys

Contact Info

Product

Resources

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Polymorph Structures, Rich Physical Properties and Potential Applications of Two‐Dimensional MoTe₂, WTe₂ and Their Alloys^†

Self-Powered Broadband Photodetectors Based on Large-Scale Continuous Films of Weyl Semimetal WTe₂

Self-Powered Broadband Photodetectors Based on Large-Scale Continuous Films of Weyl Semimetal WTe₂