Boosting in-plane anisotropy by periodic phase engineering in two-dimensional VO2 single crystals

Ran, Meng; Zhao, Chao; Xu, Xiang; Kong, Xiao; Lee, Younghee; Cui, Wenjun; Hu, Zhi-Yi; Roxas, Alexander Perez; Luo, Zhengtang; Li, Huiqiao; Ding, Feng; Gan, Lin; Zhai, Tianrui

doi:10.1016/j.fmre.2021.11.020

Cited by 12 publications

(19 citation statements)

References 43 publications

(45 reference statements)

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“…oxides. [15,28,33,34,117,118] Guo et al used MoO 3 mixed with a small amount of NaCl as precursor, reacting with S powder at high temperatures. 2D MoS 2 , MoO 3 -MoS 2 heterojunction, and MoO 3 nanosheets can be obtained when the powder is in different zones, respectively.…”

Section: Cvdmentioning

confidence: 99%

“…In-plane anisotropy 2D materials have attracted extensive attention due to their difference of in-plane optical and electrical properties in different crystal orientations. [83,167,168] Ran et al [28] presented a periodic phase engineering strategy to enhance the in-plane anisotropy of VO 2 nanosheets. By introducing alternant monoclinic and rutile phases in the VO 2 nanosheet, an ultrahigh in-plane anisotropic electrical conductivity of 113 was obtained.…”

Section: Other Applicationsmentioning

confidence: 99%

“…In addition, 2D oxides have also shown application potential in piezoelectric transistors, [23] artificial synaptic devices, [24,25] memristors, [26] and anisotropic detection. [27,28] At present, more 2D oxides have been reported, the synthesis methods are emerging constantly, and their application in the electronics and optoelectronics is increasingly extensive. Given the great advance that has been made in the studies of 2D oxides, a review is needed to summarize its advance and provide an outlook to its future development.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…i) Design of the in-plane electrical anisotropy measurement by cross-type electrode pairs. j) The initial I-V curves along the [011] and the[100] directions at 300 K and the maximum current difference curves along the [011] axis and the[100] axis during the cooling process at 355 K. k) The evolution of the conductance ratio in a cycle covering the temperature range from 300 to 400 K. i-k) Reproduced with permission [28]. Copyright 2021, KeAi Publishing.…”

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confidence: 99%

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2D Oxides for Electronics and Optoelectronics

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In recent years, 2D oxides have attracted considerable attention due to their novel physical properties and excellent stability. With the efforts of researchers, significant progress has been made in the synthesis and electronics and optoelectronics application of 2D oxides. Herein, a systematic review focusing on the preparation of 2D oxides and their applications in electronics and optoelectronics is provided. First, 2D oxides are summarized and classified according to their elements. Then, common preparation methods to synthesize 2D oxides including exfoliation, liquid‐phase synthesis, vapor deposition, surface oxidation of metal, and so on are introduced. Further, the applications of 2D oxides in electronics and optoelectronics are presented. Finally, the current challenges and envisioned development of 2D oxides are commented and prospected.

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Section: Cvdmentioning

confidence: 99%

Section: Other Applicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Emerging 2D Metal Oxides: From Synthesis to Device Integration

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2D metal oxides have aroused increasing attention in the field of electronics and optoelectronics due to their intriguing physical properties. In this review, an overview of recent advances on synthesis of 2D metal oxides and their electronic applications is presented. First, the tunable physical properties of 2D metal oxides that relate to the structure (various oxidation‐state forms, polymorphism, etc.), crystallinity and defects (anisotropy, point defects, and grain boundary), and thickness (quantum confinement effect, interfacial effect, etc.) are discussed. Then, advanced synthesis methods for 2D metal oxides besides mechanical exfoliation are introduced and classified into solution process, vapor‐phase deposition, and native oxidation on a metal source. Later, the various roles of 2D metal oxides in widespread applications, i.e., transistors, inverters, photodetectors, piezotronics, memristors, and potential applications (solar cell, spintronics, and superconducting devices) are discussed. Finally, an outlook of existing challenges and future opportunities in 2D metal oxides is proposed.

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Atomistic Observation of the Local Phase Transition in MoTe₂ for Application in Homojunction Photodetectors

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et al. 2022

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Direct atomic‐scale observation of the local phase transition in transition metal dichalcogenides (TMDCs) is critically required to carry out in‐depth studies of their atomic structures and electronic features. However, the structural aspects including crystal symmetries tend to be unclear and unintuitive in real‐time monitoring of the phase transition process. Herein, by using in situ transmission electron microscopy, information about the phase transition mechanism of MoTe2 from hexagonal structure (2H phase) to monoclinic structure (1T′ phase) driven by sublimation of Te atoms after a spike annealing is obtained directly. Furthermore, with the control of Te atom sublimation by modulating the hexagonal boron nitride (h‐BN) coverage in the desired area, the lateral 1T′‐enriched MoTe2/2H MoTe2 homojunction can be one‐step constructed via an annealing treatment. Owing to the gradient bandgap provided by 1T′‐enriched MoTe2 and 2H MoTe2, the photodetector composed of the 1T′‐enriched MoTe2/2H MoTe2 homojunction shows fast photoresponse and ten times larger photocurrents than that consisting of a pure 2H MoTe2 channel. The study reveals a route to improve the performance of optoelectronic and electronic devices based on TMDCs with both semiconducting and semimetallic phases.

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Boosting in-plane anisotropy by periodic phase engineering in two-dimensional VO2 single crystals

Cited by 12 publications

References 43 publications

2D Oxides for Electronics and Optoelectronics

2D Oxides for Electronics and Optoelectronics

Emerging 2D Metal Oxides: From Synthesis to Device Integration

Atomistic Observation of the Local Phase Transition in MoTe₂ for Application in Homojunction Photodetectors

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Boosting in-plane anisotropy by periodic phase engineering in two-dimensional VO2 single crystals

Cited by 12 publications

References 43 publications

2D Oxides for Electronics and Optoelectronics

2D Oxides for Electronics and Optoelectronics

Emerging 2D Metal Oxides: From Synthesis to Device Integration

Atomistic Observation of the Local Phase Transition in MoTe2 for Application in Homojunction Photodetectors

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Product

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Atomistic Observation of the Local Phase Transition in MoTe₂ for Application in Homojunction Photodetectors