Two-dimensional nanomaterials for novel piezotronics and piezophototronics

Lin, Pei; Pan, Caofeng; Wang, Z.L.

doi:10.1016/j.mtnano.2018.11.006

Cited by 108 publications

(84 citation statements)

References 124 publications

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“…[31], the direction perpendicular to the hypotenuse of a CVD triangle monolayer MoS 2 is in the armchair direction and parallel to the hypotenuse is the zigzag direction. [32] The green line was measured when the applied strain reached 1.4%; the results show that the source-drain current increased dramatically on both sides, and the positive current at 5 V bias is 8.6 times the current measured without strain, as shown in Figure S2, Supporting Information. The I-V curves of the device in dark under different strains with a −5 to 5 V sweeping voltage is applied as shown in Figure 2b.…”

Section: Wwwadvelectronicmatdementioning

confidence: 96%

Strain Improving the Performance of a Flexible Monolayer MoS₂ Photodetector

Shen

et al. 2019

Adv Elect Materials

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and piezophototronics in low-dimensional wurtzite structure ZnO and GaN have been systematically studied. [8,9] The piezoresistive effect is that the band gap structure of the semiconductor can be changed by strain, which can modulate the transport behavior of materials. The piezoresistive effect have been investigated in low-dimensional materials such as silicon nanowire, [10] carbon nanotube, [11] and graphene. [12] The piezoresistive materials have been widely used for improving the transport properties of transistor and force sensor. [13] 2D materials have opened up unprecedented opportunities in the semiconductor industry, and have attracted significant attention due to their subnanometer size, unique structure, and unusual electronic properties offering future advancements in electronic, optoelectronic, sensor, catalysis, and energy field. [14][15][16] In 2012, the piezoelectric [17] and piezoresistive effects [18] were predicted in 2D transition metal dichalcogenides (TMDCs). Due to the piezoresistive effect, the band gap of 2D MoS 2 decrease with the increase of strain, the direct band gap of monolayer TMDCs change to indirect band gap when the stain is 1-2% and the semiconductor TMDC became a conductor when the strain was over 10%. The piezoresistive effect was observed in photo luminescence (PL) spectrum subsequently and the piezoresistive coefficient of 2D MoS 2 was measured. [19,20] The effect of strain on the transport behavior due to piezoresistive effect was investigated and the 2D MoS 2 piezoresistive tactile sensor was invented recently. [21,22] The breaking symmetry in specific lattice orientation of 2D TMDCs materials lead to the piezoelectric effect. In 2014, the piezoelectric effect was first observed in 2D MoS 2 flexible device and the piezoelectric coefficient of monolayer MoS 2 was measured by using an atomic force microscope apparatus. [23,24] The high sensitivity piezoelectric force sensor based on monolayer MoS 2 was also developed then. [25] The piezoelectric polarization charges generated by the piezoelectric effect can tune the Schottky barrier height (SBH) of a device and the electric field at the interface of a heterostructure, which can further improve the performance of optoelectronic. Recently, Wu et al. and Lin et al. utilized the piezoelectric effect to improve the properties of metal-MoS 2 photodetector and 2D MoS 2 /WSe 2 Van der Waals heterostructure. [26,27] However, study on taking advantage of the piezoelectric and piezoresistive effects simultaneously to improve the photoelectric performance of photodetector based on 2DThe mechanically stretchable 2D materials have attracted much interest for their potential applications in flexible electronics, as well as the possibility of strain-tuning their electronic and photoelectric performance through piezoelectric and piezoresistive effects. Piezoelectric and piezoresistive effects are observed in a flexible monolayer MoS 2 device and the effect of the strain on the photoelectric properties is investigated. The light-dark curre...

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Section: Wwwadvelectronicmatdementioning

confidence: 96%

Strain Improving the Performance of a Flexible Monolayer MoS₂ Photodetector

Shen

et al. 2019

Adv Elect Materials

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“…Owing the 2D confinement and spontaneous breaking of inversion symmetry, 2D materials usually exhibit high piezo‐phototronic actives. [ 42 ] Besides, although a larger specific surface area is usually preferable in catalysis, the change in piezopotential may cause different results. The physical properties affect not only the surface area but also the distribution and strength of built‐in polarization electric field, which result in different catalytic activities.…”

Section: Fundamentals Of Piezo‐phototronic Effect On Photoinduced Catmentioning

confidence: 99%

Advances in Piezo‐Phototronic Effect Enhanced Photocatalysis and Photoelectrocatalysis

Pan

Sun

Chen

et al. 2020

Advanced Energy Materials

431

236

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The storage/utilization of solar energy is a promising strategy to alleviate current disparities in energy shortage Direct conversion of solar light into chemical energy by means of photocatalysis or photoelectrocatalysis is currently a point of focus for sustainable energy development and environmental remediation. However, its current efficiency is still far from satisfying, suffering especially from severe charge recombination. To solve this problem, the piezo-phototronic effect has emerged as one of the most effective strategies for photo(electro)catalysis. Through the integration of piezoelectricity, photoexcitation, and semiconductor properties, the built-in electric field by mechanical stimulation induced polarization can serve as a flexible autovalve to modulate the charge-transfer pathway and facilitate carrier separation both in the bulk phase and at the surfaces of semiconductors. This review focuses on illustrating the trends and impacts of research based on piezo-enhanced photocatalytic reactions. The fundamental mechanisms of piezo-phototronics modulated band bending and charge migration are highlighted. Through comparing and classifying different categories of piezo-photocatalysts (like the typical ZnO, MoS 2 , and BaTiO 3 ), the recent advances in polarization-promoted photo(electro)catalytic processes involving water splitting and pollutant degradation are overviewed. Meanwhile the optimization methods to promote their catalytic activities are described. Finally, the outlook for future development of polarization-enhanced strategies is presented.

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“…A flexible nanogenerator based on the PZT fiber‐assembled textiles could deliver a maximum output voltage and current of 6 V and 45 nA, respectively . Single‐atomic layer graphene, h‐BN, MoS 2 , MoSe 2 , and WTe 2 also show piezoelectricity as a result of strain‐inducted lattice distortion and the associated ion charge polarization . However, these materials are expensive and are hard to scale‐up, thus hindering their application.…”

Section: Materials For Energy Conversion Devicesmentioning

confidence: 99%

Fiber‐Based Energy Conversion Devices for Human‐Body Energy Harvesting

et al. 2019

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body is actually a tremendous storehouse of energy that is generated from body heat and motion. [15][16][17][18][19] Power generation from breathing, heating, blood transport, arm motion, typing, and walking could reach to over 100 W for a 68 kg adult's daily activities (Figure 1). [20] Thus, converting 1% of power from the human body may be enough to support the work of most portable electronics.In the past two decades, researchers have developed several energy conversion devices based on piezoelectricity, electrostaticity, triboelectricity, or thermoelectricity that can directly harvest the mechanical or thermal energy and convert it into electric energy (these conversion devices are so-called nanogenerators (NGs)). [21][22][23][24][25] The first nanogenerator (NG) based on ZnO was invented by Prof. Wang in 2006; after that, various NGs were developed to harvest the mechanical or thermal energy with the output performance increasing gradually. [26] These NGs are easy-to-construct flexible devices since most materials for these devices are polymers and nanomaterials. Generally, the flexible devices assembled by film materials can be stretchable and bendable in one direction. But their lack of air-permeability, poor 3D deformation, and low damage tolerance limit their application, especially for wearable electronics. Therefore, fiberbased energy conversion devices have been designed. [27] These fiber-based devices can also be knitted to yarn or fabric in the clothing system to build up a large area electronic system. [28,29] The energy generation and internal charging can be realized by means of a self-powered system that harvests the energy from natural sources around the human body to sustain the wearable electronics. [30][31][32] The search for functional materials that possess good conversion efficiency, as well as great mechanical and environmental stability, combined with a novel device design might push these devices to meet the requirement of a practical application. In the past decade, numerous contributions have been offered to improve the performance of fiber-based energy conversion devices (FBECD) and extend its application. This review specifically summarizes FBECD with different energy conversion mechanisms including piezoelectricity, electrostaticity, triboelectricity, and thermoelectricity in recent processes (Figure 2). The functional materials, fiber fabrication techniques, and device design strategies for different classes of FBECDs are covered in the article. We also introduce an overview of the fiber-based self-powered system and sensors and Following the rapid development of lightweight and flexible smart electronic products, providing energy for these electronics has become a hot research topic. The human body produces considerable mechanical and thermal energy during daily activities, which could be used to power most wearable electronics. In this context, fiber-based energy conversion devices (FBECD) are proposed as candidates for effective conversion of human-body energy into electricity...

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Two-dimensional nanomaterials for novel piezotronics and piezophototronics

Cited by 108 publications

References 124 publications

Strain Improving the Performance of a Flexible Monolayer MoS₂ Photodetector

Strain Improving the Performance of a Flexible Monolayer MoS₂ Photodetector

Advances in Piezo‐Phototronic Effect Enhanced Photocatalysis and Photoelectrocatalysis

Fiber‐Based Energy Conversion Devices for Human‐Body Energy Harvesting

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Two-dimensional nanomaterials for novel piezotronics and piezophototronics

Cited by 108 publications

References 124 publications

Strain Improving the Performance of a Flexible Monolayer MoS2 Photodetector

Strain Improving the Performance of a Flexible Monolayer MoS2 Photodetector

Advances in Piezo‐Phototronic Effect Enhanced Photocatalysis and Photoelectrocatalysis

Fiber‐Based Energy Conversion Devices for Human‐Body Energy Harvesting

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Product

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Strain Improving the Performance of a Flexible Monolayer MoS₂ Photodetector

Strain Improving the Performance of a Flexible Monolayer MoS₂ Photodetector