Tunable electronic structure of two-dimensional transition metal chalcogenides for optoelectronic applications

Jing, Yumei; Liu, Baoze; Zhu, Xukun; Ouyang, Fangping; Sun, Jian; Zhou, Yu

doi:10.1515/nanoph-2019-0574

Cited by 58 publications

(46 citation statements)

References 177 publications

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“…More significantly, it has been theoretically and experimentally proved that strain engineering is an effective method to tune the bandgap of 2D materials, which leads to efficient optical, electronic properties modulation of these materials. [ 87 ] This strain‐tunable feature is highly desirable for nanophotonic applications, motivating researchers to work on piezoelectricity in 2D materials for practical applications. [ 80,87,88 ]…”

Section: Piezophototronic Effect and Its Applications For 2d Materialsmentioning

confidence: 99%

“…[ 87 ] This strain‐tunable feature is highly desirable for nanophotonic applications, motivating researchers to work on piezoelectricity in 2D materials for practical applications. [ 80,87,88 ]…”

Section: Piezophototronic Effect and Its Applications For 2d Materialsmentioning

confidence: 99%

“…[81] More significantly, it has been theoretically and experimentally proved that strain engineering is an effective method to tune the bandgap of 2D materials, which leads to efficient optical, electronic properties modulation of these materials. [87] This strain-tunable feature is highly desirable for nanophotonic applications, motivating researchers to work on piezoelectricity in 2D materials for practical applications. [80,87,88] In the following, 2D materials with the piezoelectric property that have been theoretically and experimentally confirmed in recent years will be reviewed, including h-BN, TMDC, BP, allotrope of carbon, and so on.…”

Section: D Materials With Piezophototronic Effectmentioning

confidence: 99%

“…[87] This strain-tunable feature is highly desirable for nanophotonic applications, motivating researchers to work on piezoelectricity in 2D materials for practical applications. [80,87,88] In the following, 2D materials with the piezoelectric property that have been theoretically and experimentally confirmed in recent years will be reviewed, including h-BN, TMDC, BP, allotrope of carbon, and so on. Table 3 shows a key parameter, piezoelectric coefficient, of these piezoelectric semiconductors.…”

Section: D Materials With Piezophototronic Effectmentioning

confidence: 99%

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Tunable Optical Properties of 2D Materials and Their Applications

Ren

et al. 2020

Advanced Optical Materials

154

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unlimited possibilities in the improvement of the performances of optoelectronic devices. [19-23] Beyond that, the properties of 2D materials can be tuned in situ by using different approaches [24-26] to expand the functionalities of optoelectronic devices. Out of them, the tunability in their optical properties has attracted great interest over the past decades where researchers dedicated to discovering various tuning methods to realize desired outcomes. [27,28] More excitingly, owing to the unprecedented electronic properties, high stretchability, magnetism, and thermal conductivity of 2D materials, different tuning approaches such as electrical gating, external strain stimuli, a static magnetic field, surface acoustic waves (SAWs), and thermal heating can be simultaneously adopted to participate the light-matter interaction, leading to the tailored and synergetic optical response of 2D materials. [29] Table 1 illustrates a brief advantages and weaknesses analysis between different optical tuning approaches of 2D and non-2D materials. There is a huge potential to revolutionize the optoelectronic devices by incorporating 2D materials with tunable optical properties. [30,31] So far, researchers have achieved flagship milestones in this area where a diverse set of high-performance optical devices are realized including modulators, photodetectors, optical sources, and optical switches. [32] In this review, we primarily focus on the theoretical and experimental researches of optical effects causing by various external stimuli in 2D materials. In Section 2, 2D materials with electro-optic effect and its application will be discussed, followed by piezophototronic effect and its application in Section 3. In Section 4, 2D materials with magneto-optic effect and its application will be discussed. Then, acousto-optic (AO) effect and its application, and thermo-optic (TO) effect and its application will be discussed in Sections 4 and 5, respectively. In the last section, the conclusion and perspective will be provided. 2. Electro-Optic Effect and Its Applications for 2D Materials 2.1. 2D Materials with Electro-Optic Effect In a broad sense, electro-optic effect is about an optical property change in the materials when applying an electric field. As shown in Figure 1, the refractive index of the material can be tuned in the presence of electric field due to the variation of charge carrier density. [29] This effect involves several Recent efforts have been heavily devoted to the development of next-generation optoelectronic devices based on 2D materials, due to their unique optical properties that are distinctly different from those of bulk counterparts. Given that the feature of flexible tunability is highly desired, various approaches have been demonstrated to efficiently modulate the optical properties, eventually enabling peculiar functionalities or realizing high-performance nanoscale devices. Here, this review focuses on recent advances in tuning the optical properties of 2D materials by external stimuli including elec...

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Section: Piezophototronic Effect and Its Applications For 2d Materialsmentioning

confidence: 99%

Section: Piezophototronic Effect and Its Applications For 2d Materialsmentioning

confidence: 99%

Section: D Materials With Piezophototronic Effectmentioning

confidence: 99%

Section: D Materials With Piezophototronic Effectmentioning

confidence: 99%

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Tunable Optical Properties of 2D Materials and Their Applications

Ren

et al. 2020

Advanced Optical Materials

154

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“…(LDH) consist of metallic cations with multivalent states, interlayer anions, and water molecules for charge balance that stabilized as unique layered structures, [21][22][23][24] which have been extensity explored as the potential candidates for supercapacitors applications including NiCo, [14,[25][26][27][28] NiMn, [29,30] CoMn, CoFe, and other doped systems. [31] In particular, Ni-based LDHs have a fabulous theoretical specific capacitance of more than 3000 F g −1 .…”

Section: Introductionmentioning

confidence: 99%

3D Lattice‐Matching Layered Hydroxide Heterostructure with Improved Interfacial Charge Transfer and Ion Diffusion for High Energy Density Supercapacitor

Liu

Zhu

Tian

et al. 2021

Adv Materials Inter

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The electrochemical charge storage mostly relies on the electrical properties of complex interfaces and electrode materials as well as the dynamic ions diffusion in the electrolytes. Nickel‐cobalt layered double hydroxides (LDHs) with tunable chemical composition are promising for electrochemical supercapacitors, where the theoretical performance could be up to 3000 F g−1. However, the experimental performances of NiCo‐LDHs are still limited by low charge transfer rate and slow dynamic ions diffusion. Here, a 3D lattice matching Ni0.85Co0.15(OH)2@α‐Co(OH)2 heterostructure is epitaxially grown. The experimental results and theoretical calculation confirm that such a 3D heterostructure could improve charge transfer abilities and accelerated ions diffusion. The specific capacitance of 2480 F g−1 and retained 71% of the initial capacitance at high current density of 30 A g−1 have been achieved by optimal Co(OH)2 amount of 20 mg (NCC‐20). Asymmetric button devices and soft‐pack devices have been demonstrated with exceptional energy densities of 69.2 and 65.7 Wh kg−1 at power densities of 0.79 and 0.78 kW kg−1, and maintained 88% and 80% initial capacitance under 10 000 cycles, respectively. The general design principles clearly demonstrate the importance of electrochemical interface and dynamic process, paving the way to push forward the application capability of electrochemical devices.

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Advances in Liquid‐Phase and Intercalation Exfoliations of Transition Metal Dichalcogenides to Produce 2D Framework

Raza

Hassan

Ikram

et al. 2021

Adv Materials Inter

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(5 of 46)www.advmatinterfaces.de Figure 3. a) Electronic band structure of various 2D materials. Reproduced under the terms of the CC-BY 4.0 license. [95] Copyright 2016, The Authors, published by MDPI. b) Energy level diagrams of various TMDCs. Reproduced with permission. [19] Copyright 2017, Elsevier B.V. c) Archetypal coordination of TMDCs, octahedral coordination forms 1T structures, while triangular prismatic coordination establishes 2H/3R structures. Reproduced with permission. [82] Copyright 2019, Elsevier. d) Structural top view of various polytypes; in 2H, two layers per repeat, the unit shows trigonal prismatic coordination and in 1T, one layer per repeat unit formed octahedral coordination of TMDCs. Reproduced with permission. [89] Copyright 2012, Springer Nature. e) 3D illustration of typical MX 2 structure having chalcogen (yellow atom) and metal (gray atom). Reproduced with permission. [104] Copyright 2011, Springer Nature. f) Schematic demonstration of phonon active modes and their symmetries of bulks and monolayer in MX 2 structures. Reproduced under the terms of the CC-BY 3.0 license. [105]

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Tunable electronic structure of two-dimensional transition metal chalcogenides for optoelectronic applications

Cited by 58 publications

References 177 publications

Tunable Optical Properties of 2D Materials and Their Applications

Tunable Optical Properties of 2D Materials and Their Applications

3D Lattice‐Matching Layered Hydroxide Heterostructure with Improved Interfacial Charge Transfer and Ion Diffusion for High Energy Density Supercapacitor

Advances in Liquid‐Phase and Intercalation Exfoliations of Transition Metal Dichalcogenides to Produce 2D Framework

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