Layer-dependent surface potential of phosphorene and anisotropic/layer-dependent charge transfer in phosphorene–gold hybrid systems

Xu, Ruijuan; Yang, Jiong; Zhu, Yi; Han, Yan; Pei, Jiajie; Myint, Ye Win; Zhang, Shuang; Lu, Yuerui

doi:10.1039/c5nr04366b

Cited by 65 publications

(72 citation statements)

References 35 publications

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“…Other works are categorized toward environmental engineering modulations in the external environment within the vicinity of 2D layers, such as dielectric screening, chemical doping, magnetic field, and substrates . Environmental dielectrics have been found to strongly influence the Coulomb interactions in low dimensional materials .…”

Section: Modulation Of Materials Propertiesmentioning

confidence: 99%

Many‐Body Complexes in 2D Semiconductors

et al. 2018

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2D semiconductors such as transition metal dichalcogenides (TMDs) and black phosphorus (BP) are currently attracting great attention due to their intrinsic bandgaps and strong excitonic emissions, making them potential candidates for novel optoelectronic applications. Optoelectronic devices fabricated from 2D semiconductors exhibit many-body complexes (exciton, trion, biexciton, etc.) which determine the materials optical and electrical properties. Characterization and manipulation of these complexes have become a reality due to their enhanced binding energies as a direct result from reduced dielectric screening and enhanced Coulomb interactions in the 2D regime. Furthermore, the atomic thickness and extremely large surface-to-volume ratio of 2D semiconductors allow the possibility of modulating their inherent optical, electrical, and optoelectronic properties using a variety of different environmental stimuli. To fully realize the potential functionalities of these many-body complexes in optoelectronics, a comprehensive understanding of their formation mechanism is essential. A topical and concise summary of the recent frontier research progress related to many-body complexes in 2D semiconductors is provided here. Moreover, detailed discussions covering the aspects of fundamental theory, experimental investigations, modulation of properties, and optoelectronic applications are given. Lastly, personal insights into the current challenges and future outlook of many-body complexes in 2D semiconducting materials are presented.

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Section: Modulation Of Materials Propertiesmentioning

confidence: 99%

Many‐Body Complexes in 2D Semiconductors

et al. 2018

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“…But no detailed experimental or theoretical studies have been directed toward in‐plane isotropic/anisotropic until this date. However, Xu et al investigated the anisotropic PL quenching of BP in a BP–Au structure, this quenching was due to possible band alignments in between the gold (Au) and BP . Figure presents the Au–BP hybrid system with anisotropic PL emissions from BP and its anisotropic PL quenching in an Au–BP hybrid system.…”

Section: Unique 1d/2d Quasiparticles Dynamics Of In‐plane Isotropic/amentioning

confidence: 99%

In‐Plane Isotropic/Anisotropic 2D van der Waals Heterostructures for Future Devices

Neupane

Zhou

Chen

et al. 2019

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Mono‐ to few‐layers of 2D semiconducting materials have uniquely inherent optical, electronic, and magnetic properties that make them ideal for probing fundamental scientific phenomena up to the 2D quantum limit and exploring their emerging technological applications. This Review focuses on the fundamental optoelectronic studies and potential applications of in‐plane isotropic/anisotropic 2D semiconducting heterostructures. Strong light–matter interaction, reduced dimensionality, and dielectric screening in mono‐ to few‐layers of 2D semiconducting materials result in strong many‐body interactions, leading to the formation of robust quasiparticles such as excitons, trions, and biexcitons. An in‐plane isotropic nature leads to the quasi‐2D particles, whereas, an anisotropic nature leads to quasi‐1D particles. Hence, in‐plane isotropic/anisotropic 2D heterostructures lead to the formation of quasi‐1D/2D particle systems allowing for the manipulation of high binding energy quasi‐1D particle populations for use in a wide variety of applications. This Review emphasizes an exciting 1D–2D particles dynamic in such heterostructures and their potential for high‐performance photoemitters and exciton–polariton lasers. Moreover, their scopes are also broadened in thermoelectricity, piezoelectricity, photostriction, energy storage, hydrogen evolution reactions, and chemical sensor fields. The unique in‐plane isotropic/anisotropic 2D heterostructures may open the possibility of engineering smart devices in the nanodomain with complex opto‐electromechanical functions.

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“…TheSKPM images show that the WF of the BP flakes ranges from 4.45 to 4.75 eV.P ristine (0 hour) BP shows alayer-dependent WF as previously reported. [25,26] Combined with AFM topography,itwas shown that the time evolution of the WF also depends on the number of layers even under dark conditions.T ou nderstand the time evolution of the layerdependent degradation, topographical and chemical changes on the BP surface are discussed below. Figure 2s hows the time-dependent height profiles obtained from the dotted arrows (profile A) in Figure 1a across 2L (blue) and bulk BP (red) over 48 hours.The inset of Figure 2shows that the height of the 2L region had gradually increased by 2.5 nm after 6hours (or 15 hours in an average manner throughout the whole 2L region, see Figure 3below), and then bubbles began to form.…”

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confidence: 99%

Intrinsic Correlation between Electronic Structure and Degradation: From Few‐Layer to Bulk Black Phosphorus

Kim

Park

et al. 2019

Angew Chem Int Ed

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Blackphosphorus (BP) has received muchattention owingt oi ts fascinating properties,s uch as ah igh carrier mobility and tunable band gap.H owever,t hese advantages have been overshadowed by the fast degradation of BP under ambient conditions.T oo vercome this obstacle,t he exact degradation mechanisms need to be unveiled. Herein, we analyzed two sequential degradation processes and the layerdependent degradation rates of BP in the dark by scanning Kelvin probe microscopy(SKPM) measurements and theoretical modeling.T he layer-dependent degradation was successfully interpreted by considering the oxidation model based on the Marcus-Gerischer theory (MGT). In the dark, the electron transfer rate from BP to oxygen molecules depends on the number of layers as these systems have different carrier concentrations.T his work not only provides ad eeper understanding of the degradation mechanism itself but also suggest new strategies for the design of stable BP-based electronics.

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Layer-dependent surface potential of phosphorene and anisotropic/layer-dependent charge transfer in phosphorene–gold hybrid systems

Cited by 65 publications

References 35 publications

Many‐Body Complexes in 2D Semiconductors

Many‐Body Complexes in 2D Semiconductors

In‐Plane Isotropic/Anisotropic 2D van der Waals Heterostructures for Future Devices

Intrinsic Correlation between Electronic Structure and Degradation: From Few‐Layer to Bulk Black Phosphorus

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