High-performance photodetectors for visible and near-infrared lights based on individual WS2 nanotubes

Zhang, Chaoying; Wang, Sheng; Yang, Leijing; Liu, Yang; Xu, Tingting; Ning, Zhiyuan; Zak, Alla; Zhang, Zhiyong; Tenne, Reshef; Chen, Qing

doi:10.1063/1.4729144

Cited by 119 publications

(81 citation statements)

References 20 publications

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“…Moreover, the presence of gas molecules can also affect the dynamic response of the device, which is discussed in detail in Supporting Information (Figure S7). Briefly, unlike the single exponential formula for fitting the rise and fall photocurrent in other reports1446, the dynamic response for rise and fall in our device under the reducing atmosphere (ethanol and NH 3 ) can be perfectly fitted by double exponential formula, further indicating the existence of two physical mechanisms including rapid generation or recombination of photo-excited electron-hole pairs and gas adsorption or charge transfer process in the dynamic response to the light switching on/off.…”

Section: Resultsmentioning

confidence: 81%

Photoresponsive and Gas Sensing Field-Effect Transistors based on Multilayer WS2 Nanoflakes

Huo

Yang

Wei

et al. 2014

Sci Rep

410

299

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The photoelectrical properties of multilayer WS2 nanoflakes including field-effect, photosensitive and gas sensing are comprehensively and systematically studied. The transistors perform an n-type behavior with electron mobility of 12 cm2/Vs and exhibit high photosensitive characteristics with response time (τ) of <20 ms, photo-responsivity (Rλ) of 5.7 A/W and external quantum efficiency (EQE) of 1118%. In addition, charge transfer can appear between the multilayer WS2 nanoflakes and the physical-adsorbed gas molecules, greatly influencing the photoelectrical properties of our devices. The ethanol and NH3 molecules can serve as electron donors to enhance the Rλ and EQE significantly. Under the NH3 atmosphere, the maximum Rλ and EQE can even reach 884 A/W and 1.7 × 105%, respectively. This work demonstrates that multilayer WS2 nanoflakes possess important potential for applications in field-effect transistors, highly sensitive photodetectors, and gas sensors, and it will open new way to develop two-dimensional (2D) WS2-based optoelectronics.

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Section: Resultsmentioning

confidence: 81%

Photoresponsive and Gas Sensing Field-Effect Transistors based on Multilayer WS2 Nanoflakes

Huo

Yang

Wei

et al. 2014

Sci Rep

410

299

View full text Add to dashboard Cite

show abstract

“…Many materials and structures including quantum dots [90][91][92], nanotubes [93][94][95][96], and nanowires [97][98][99] have been studied and considered to be good alternatives for silicon-based photodetectors. Interestingly, most of the 2D semiconductors are sensitive to light, heat, and ambient which makes them very attractive for applications in optoelectronic device sensing from infrared to the ultraviolet regime.…”

Section: Photodectorsmentioning

confidence: 99%

Progress on Crystal Growth of Two-Dimensional Semiconductors for Optoelectronic Applications

Sun¹,

Xu²,

Zhang³

et al. 2018

Crystals

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Two-dimensional (2D) semiconductors are thought to belong to the most promising candidates for future nanoelectronic applications, due to their unique advantages and capability in continuing the downscaling of complementary metal-oxide-semiconductor (CMOS) devices while retaining decent mobility. Recently, optoelectronic devices based on novel synthetic 2D semiconductors have been reported, exhibiting comparable performance to the traditional solid-state devices. This review briefly describes the development of the growth of 2D crystals for applications in optoelectronics, including photodetectors, light-emitting diodes (LEDs), and solar cells. Such atomically thin materials with promising optoelectronic properties are very attractive for future advanced transparent optoelectronics as well as flexible and wearable/portable electronic devices.

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confidence: 99%

“…[16] Prior to studying the hybrid devices, we probe individual WS 2 nanotubes and show that they offer a good optoelectronic platform. [17,18] We used WS 2 multiwalled * deshmukh@tifr.res.in † contributed equally nanotubes [8,19] obtained from NanoMaterials. [20] Transmission electron microscope (TEM) images of the nanotubes (see Fig.…”

mentioning

confidence: 99%

“…This result is an improvement compared with the response times of other few/single layer devices of MoS 2 and WS 2 reported in the literature [27][28][29] and is comparable to the projected value for WS 2 nanotubes. [18] The reflected light, incident on the photodetector, was also measured using a lock-in amplifier, which provided information regarding the absorption of light by the material. [30,31] The map of the reflected light (see Fig.…”

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confidence: 99%

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Light matter interaction in WS₂ nanotube-graphene hybrid devices

et al. 2014

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We study the light matter interaction in WS2 nanotube-graphene hybrid devices. Using scanning photocurrent microscopy we find that by engineering graphene electrodes for WS2 nanotubes we can improve the collection of photogenerated carriers. We observe inhomogeneous spatial photocurrent response with an external quantum efficiency of ∼1% at 0 V bias. We show that defects play an important role and can be utilized to enhance and tune photocarrier generation.Heterostructure devices of transition metal dichalcogenides (TMDCs) and graphene have generated considerable research interest recently because of their superior optical and electronic properties.[1, 2] The semiconducting nature of TMDCs combined with the presence of van Hove singularities in their electronic density of states allows for efficient photon absorption and carrier generation under optical excitation.[3] Combining this feature with the high mobility of graphene has led to optoelectronic studies of heterostructure devices comprising graphene and single layer TMDCs. [1,[3][4][5][6][7] These devices have exhibited good quantum efficiency for photocurrent generation in the visible range. However, the fabrication of such heterostructures requires multiple exfoliation and transfer steps. TMDC nanotubes[8] represent another alternative for such applications; nanowires offer an additional advantage because they can enhance the absorption of light through the formation of optical cavities[9, 10] and quasi 1D structures are known to enhance light matter interaction by virtue of an enhanced joint density of states (JDOS).[11] Silicon and carbon nanotubes have been shown to be promising materials for solar-cell applications. [12,13] Similarly, TMDC nanotubes could also allow for large scale integration of on-chip optoelectronic elements. In addition, the curvature of the nanotubes can be used to engineer spin and valley based optoelectronic control in dichalcogenide systems.[14] Here, we investigate the photoresponse of WS 2 nanotubes with field-effect transistor geometry and the enhanced photoresponse properties of hybrid devices of WS 2 nanotubes with graphene electrodes. One of the motivations for using graphene electrodes for the nanotube is to modulate the density of carriers in the electrodes and modify the Schottky barrier;[15] the other motivation is to observe the spatial homogeneity of the photoresponse. We investigate the efficiency of these devices for photoconversion and attempt to understand the role of defects in modifying optoelectronic properties. [16] Prior to studying the hybrid devices, we probe individual WS 2 nanotubes and show that they offer a good optoelectronic platform. [17,18] We used WS 2 multiwalled * deshmukh@tifr.res.in

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High-performance photodetectors for visible and near-infrared lights based on individual WS2 nanotubes

Cited by 119 publications

References 20 publications

Photoresponsive and Gas Sensing Field-Effect Transistors based on Multilayer WS2 Nanoflakes

Photoresponsive and Gas Sensing Field-Effect Transistors based on Multilayer WS2 Nanoflakes

Progress on Crystal Growth of Two-Dimensional Semiconductors for Optoelectronic Applications

Light matter interaction in WS₂ nanotube-graphene hybrid devices

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High-performance photodetectors for visible and near-infrared lights based on individual WS2 nanotubes

Cited by 119 publications

References 20 publications

Photoresponsive and Gas Sensing Field-Effect Transistors based on Multilayer WS2 Nanoflakes

Photoresponsive and Gas Sensing Field-Effect Transistors based on Multilayer WS2 Nanoflakes

Progress on Crystal Growth of Two-Dimensional Semiconductors for Optoelectronic Applications

Light matter interaction in WS2 nanotube-graphene hybrid devices

Contact Info

Product

Resources

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Light matter interaction in WS₂ nanotube-graphene hybrid devices