Separating electrons and holes by monolayer increments in van der Waals heterostructures

Ceballos, Frank; Zereshki, Peymon; Zhao, Hui

doi:10.1103/physrevmaterials.1.044001

Cited by 49 publications

(50 citation statements)

References 58 publications

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“…[ 269,270 ] The linear and NLO graphene response with a variable capacity [ 240,271,272 ] permits several electrically tunable NLO equipment's. [ 273 ] Massless Dirac fermions in graphene have extraordinary strong third‐order NL properties. NLO susceptibilities for THG, FWM, and self‐phase modulation alter ≈6 times.…”

Section: Fundamental Concept About 2d Materials and Their Optical Propertiesmentioning

confidence: 99%

An Insightful Picture of Nonlinear Photonics in 2D Materials and their Applications: Recent Advances and Future Prospects

Ahmed

Wang

Kalsoom

et al. 2021

Advanced Optical Materials

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The nonlinear optical (NLO) materials are playing a crucial role in almost all aspects of photonics including imaging frequency, manipulation, photon generation, transmission and detection. The nonlinear optics aims to investigate light response in NLO media, in which the NLO response is normally weak and low energy efficient. A comprehensive summary, discussion, and correlation of the light–matter interaction in the 2D nano‐platform, like graphene and TMDCs, would be inspirational and timely needed. In this contribution, a broad overview and discussion about recent experimental evolution regarding the NLO response and its corresponding applications in various 2D materials are presented. A wide material library including graphene, transition metal dichalcogenides, black phosphorus, MXenes, semimetals, polymer materials, and hybrid structures (0D, 1D, 3D) are discussed. In this review, the qualitative description of NLO is firstly illustrated, followed by various fundamental NLO processes being highlighted. Fundamental limits of nonlinear optics and some of NLO applications are prospected. It is hoped that this comprehensive review will shed a light on the development of nonlinear optics with 2D materials to be applied in the field of photonics and optoelectronics.

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Section: Fundamental Concept About 2d Materials and Their Optical Propertiesmentioning

confidence: 99%

An Insightful Picture of Nonlinear Photonics in 2D Materials and their Applications: Recent Advances and Future Prospects

Ahmed

Wang

Kalsoom

et al. 2021

Advanced Optical Materials

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“…First, a ReS 2 flake containing 1L and 2L regions was mechanically exfoliated on a polydimethylsiloxane (PDMS) substrate. Since the substrate (about 1 mm) is much thicker than the ReS 2 flake and is transparent, the optical contrast of the flake is proportional to its thickness 11,[51][52][53][54] . By investigating a large number of thin flakes, we establish that the contrast of 1L is about 15.5%.…”

Section: Sample Fabrication and Photoluminescencementioning

confidence: 99%

Interlayer charge transfer in ReS2/WS2 van der Waals heterostructures

Zereshki

Peng

et al. 2019

Phys. Rev. B

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We observed ultrafast charge transfer between distorted-1T -ReS 2 with anisotropic in-plane electronic and optical properties and 2H-WS 2 that is in-plane isotropic. Heterostructures of monolayer ReS 2 /monolayer WS 2 and bilayer ReS 2 /monolayer WS 2 were fabricated by mechanical exfoliation and dry transfer techniques. Significant photoluminescence quenching of WS 2 in the heterostructures indicates efficient charge transfer. In femtosecond transient absorption measurements, it was found that holes injected in monolayer or bilayer ReS 2 transfer to WS 2 on a time scale shorter than time resolution of the measurement. This observation provides evidence that the holes are delocalized in bilayer ReS 2 , revealing strong van der Waals interlayer couplings. These results also show that ReS 2 and WS 2 form type-II heterostructures with excellent charge transfer properties.

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“…Compared to conventional semiconductor heterostructures, the emerging 2D layered heterostructures with van der Waals (vdW) interaction between the layers offer a perfect platform for band alignment engineering via stacking different layers with distinct band structures . In addition, the formed atomically sharp interfaces in these heterostructures facilitate many interfacial photophysics processes, such as interfacial charge transfer, which can be utilized for high‐performance device applications. For 2D layered heterostructures with a type‐II (staggered) band alignment, photogenerated electrons or holes can transfer across the interface and be separated at different layers due to the band offset, making these heterostructures ideal for light harvesting and photodetection .…”

mentioning

confidence: 99%

Direct Vapor Growth of 2D Vertical Heterostructures with Tunable Band Alignments and Interfacial Charge Transfer Behaviors

et al. 2019

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2D vertical van der Waals (vdW) heterostructures with atomically sharp interfaces have attracted tremendous interest in 2D photonic and optoelectronic applications. Band alignment engineering in 2D heterostructures provides a perfect platform for tailoring interfacial charge transfer behaviors, from which desired optical and optoelectronic features can be realized. Here, by developing a two‐step chemical vapor deposition strategy, direct vapor growth of monolayer PbI 2 on monolayer transition metal dichalcogenides (TMDCs) (WS 2 , WSe 2 , or alloying WS 2(1− x ) Se 2 x ), forming bilayer vertical heterostructures, is demonstrated. Based on the calculated electron band structures, the interfacial band alignments of the obtained heterostructures can be gradually tuned from type‐I (PbI 2 /WS 2 ) to type‐II (PbI 2 /WSe 2 ). Steady‐state photoluminescence (PL) and time‐resolved PL measurements reveal that the PL emissions from the bottom TMDC layers can be modulated from apparently enhanced (for WS 2 ) to greatly quenched (for WSe 2 ) compared to their monolayer counterparts, which can be attributed to the band alignment–induced distinct interfacial charge transfer behaviors. The band alignment nature of the heterostructures is further demonstrated by the PL excitation spectroscopy and interlayer exciton investigation. The realization of 2D vertical heterostructures with tunable band alignments will provide a new material platform for designing and constructing multifunctional optoelectronic devices.

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Separating electrons and holes by monolayer increments in van der Waals heterostructures

Cited by 49 publications

References 58 publications

An Insightful Picture of Nonlinear Photonics in 2D Materials and their Applications: Recent Advances and Future Prospects

An Insightful Picture of Nonlinear Photonics in 2D Materials and their Applications: Recent Advances and Future Prospects

Interlayer charge transfer in ReS2/WS2 van der Waals heterostructures

Direct Vapor Growth of 2D Vertical Heterostructures with Tunable Band Alignments and Interfacial Charge Transfer Behaviors

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