In Situ Fabrication of PdSe₂/GaN Schottky Junction for Polarization-Sensitive Ultraviolet Photodetection with High Dichroic Ratio

ACS Nano, Год журнала: 2022, Номер 16(4), С. 5545 - 5555

Опубликована: Март 24, 2022

Polarization-sensitive ultraviolet (UV) photodetection is of great technological importance for both civilian and military applications. Two-dimensional (2D) group-10 transition-metal dichalcogenides (TMDs), especially palladium diselenide (PdSe2), are promising candidates polarized due to their low-symmetric crystal structure. However, the lack an efficient heterostructure severely restricts applications in UV-polarized photodetection. Here, we develop a PdSe2/GaN Schottky junction by situ van der Waals growth highly polarization-sensitive UV Owing high-quality junction, device exhibits appealing detection performance terms large responsivity 249.9 mA/W, high specific detectivity, fast response speed. More importantly, thanks puckered structure PdSe2 layer, sensitive light with dichroic ratio up 4.5, which among highest 2D TMD material-based photodetectors. These findings further enable demonstration outstanding imaging capability as well its utility optical receiver secure communication. Our work offers strategy fabricate PdSe2-based high-performance

Язык: Английский

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2D Material‐Based Heterostructures for Rechargeable Batteries

Advanced Energy Materials, Год журнала: 2021, Номер 12(4)

Опубликована: Июнь 26, 2021

Abstract 2D materials are regarded as promising electrode for rechargeable batteries because of their advantages in providing ample active sites and improving electrochemical reaction kinetics. However, it remains a great challenge to fulfill all requirements high‐performance energy storage devices terms electronic conductivity, the number accessible sites, structural stability, mass production capability. Recent advances constructing material‐based heterostructures offer opportunities utilizing synergistic effects between individual blocks achieve optimized properties enhanced performance. In this perspective, latest summarized, with particular emphasis on multifunctional roles batteries. Synthetic strategies, features mixed dimensionalities, structure engineering distinct functionalities various applications systematically introduced. Finally, challenges perspectives presented highlight future developing practical storage.

Язык: Английский

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Giant nonlinear optical activity in two-dimensional palladium diselenide

Nature Communications, Год журнала: 2021, Номер 12(1)

Опубликована: Фев. 17, 2021

Abstract Nonlinear optical effects in layered two-dimensional transition metal chalcogenides have been extensively explored recently because of the promising prospect nonlinear for various optoelectronic applications. However, these materials possess sizable bandgaps ranging from visible to ultraviolet region, so investigation narrow-bandgap remains deficient. Here, we report our comprehensive study on processes palladium diselenide (PdSe 2 ) that has a near-infrared bandgap. Interestingly, this material exhibits unique thickness-dependent second harmonic generation feature, which is contrast other chalcogenides. Furthermore, two-photon absorption coefficients 1–3 layer PdSe ( β ~ 4.16 × 10 5 , 2.58 and 1.51 cm GW −1 are larger by two three orders magnitude than conventional materials, giant modulation depths α s 32%, 27%, 24%) were obtained . Such characteristics make potential candidate technological innovations devices.

Язык: Английский

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Anisotropic Low‐Dimensional Materials for Polarization‐Sensitive Photodetectors: From Materials to Devices

Advanced Optical Materials, Год журнала: 2022, Номер 10(6)

Опубликована: Янв. 21, 2022

Abstract Polarization‐sensitive detectors based on anisotropic low‐dimensional materials have been widely investigated in recent years. Some possess anisotropy characteristics owing to their low‐symmetry intrinsic crystal structures or external geometry morphology exhibiting distinct vibrational, optical, electronic, and electrical properties. In general, the polarization state of light will change with certain regularity when polarized interacts medium. Therefore, are very suitable for preparation polarization‐sensitive photodetectors. Here, an overview development photodetectors systems is presented. The classification properties presented characterization highlighted. Particularly, different material from perspective crystallography analyzed working mechanism discussed. Then, advances materials‐based reviewed detail. Finally, a summary this review made some breakthroughs future burgeoning field addressed.

Язык: Английский

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Layer-dependent optical and dielectric properties of centimeter-scale PdSe2 films grown by chemical vapor deposition

npj 2D Materials and Applications, Год журнала: 2022, Номер 6(1)

Опубликована: Янв. 10, 2022

Abstract Palladium diselenide (PdSe 2 ), a new type of two-dimensional noble metal dihalides (NMDCs), has received widespread attention for its excellent electrical and optoelectronic properties. Herein, high-quality continuous centimeter-scale PdSe films with layers in the range 3L–15L were grown using Chemical Vapor Deposition (CVD) method. The absorption spectra DFT calculations revealed that bandgap decreased increasing number layers, which is due to enhancement orbital hybridization. Spectroscopic ellipsometry (SE) analysis shows significant layer-dependent optical dielectric This mainly unique strong exciton effect thin film UV band. In particular, temperature on properties was also observed, thermo-optical coefficients different calculated. study provides fundamental guidance fabrication optimization -based devices.

Язык: Английский

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Topological phase singularities in atomically thin high-refractive-index materials

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Апрель 19, 2022

Atomically thin transition metal dichalcogenides (TMDCs) present a promising platform for numerous photonic applications due to excitonic spectral features, possibility tune their constants by external gating, doping, or light, and mechanical stability. Utilization of such materials sensing optical modulation purposes would require clever design, as itself the 2D can offer only small phase delay - consequence atomic thickness. To address this issue, we combine films semiconductors which exhibit lines with Fabry-Perot resonators standard commercial SiO2/Si substrate, in order realize topological singularities reflection. Around these singularities, reflection spectra demonstrate rapid changes while structure behaves perfect absorber. Furthermore, that are ubiquitous entire class atomically TMDCs other high-refractive-index materials, making it powerful tool engineering flat optics. As practical demonstration, employ PdSe2 refractive index sensor its superior sensitivity compared typical surface plasmon resonance sensors.

Язык: Английский

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A solution-processable natural crystal with giant optical anisotropy for efficient manipulation of light polarization

Nature Photonics, Год журнала: 2024, Номер 18(9), С. 922 - 927

Опубликована: Июнь 14, 2024

Язык: Английский

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Room-temperature anisotropic in-plane spin dynamics in graphene induced by PdSe2 proximity

Nature Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 7, 2025

Язык: Английский

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Simultaneous AoLP and DoLP Detection in a Bias‐Switchable PdSe₂/MoS₂/PdSe₂ Heterojunction for Polarization Discrimination

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 10, 2025

On-chip polarized photodetectors play a crucial role in advancing ultra-compact optoelectronic devices for next-generation technologies. However, simultaneously detecting the angle of linear polarization (AoLP) and degree (DoLP) within single device remains challenging task, particularly due to inherently weak states found naturally anisotropic materials. In this paper, it is reported on development twisted monopole barrier photodetector based PdSe2/MoS2/PdSe2 configuration. This features rapid response time 7-12 µs. an imaging demonstration, operates as single-polarization photodetector, reconstructing AoLP DoLP distributions target objects through bias-switchable detection across wide spectral range, all without plasmonic/metasurface nanostructures or filters. Additionally, demonstrates bipolar characteristics under zero-bias conditions at room temperature, enabling dual-binary coding polarimetric-encoded communication. These combination positions highly promising candidate on-chip applications.

Язык: Английский

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Review of Anisotropic 2D Materials: Controlled Growth, Optical Anisotropy Modulation, and Photonic Applications

Laser & Photonics Review, Год журнала: 2021, Номер 15(12)

Опубликована: Окт. 27, 2021

Abstract Anisotropic 2D materials are promising building blocks for future photonic and optoelectronic devices due to their low structural symmetry in‐plane optical anisotropy. This review systematically summarizes the crystalline structure, growth dynamics, anisotropy modulation strategies, corresponding applications emerging anisotropic materials. First, physical properties structures of typical briefly introduced. After that, special attention is paid mechanism low‐symmetry lattices, where competition between different modes determines crystal morphologies. Then, principles absorption, photoluminescence, Raman scattering, photodetection, nonlinear response discussed based on recent scientific advances. The discussion techniques modify intrinsic anisotropy, along with possibility introducing isotropic materials, add a new degree freedom control over properties. application prospects also helps bridge gap exploration novel development polarization‐sensitive devices. discussions in this will push forward frontier

Язык: Английский

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