High-performance and scalable metal-chalcogenide semiconductors and devices via chalco-gel routes

Kwon, Sung Min; Won, Jong Kook; Jo, Jeong Wan; Kim, Jae Hyun; Kim, Hee Joong; Kwon, Hyuck In; Kim, Jaekyun; Ahn, Sangdoo; Kim, Yong Hoon; Lee, Myoung-Jae; Lee, Hyung Ik; Marks, Tobin J.; Kim, Myung Gil; Park, Sung Kyu

doi:10.1126/sciadv.aap9104

Cited by 55 publications

(19 citation statements)

References 62 publications

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“…As a consequence, the presence of the metallic edge states in nanosized c-TMDs confers them peculiar properties, absent in their bulk counterparts, that affect not only their catalytic activity but also their optical and electrical characteristics: the changes in electronic structure prompted by the nanosizing and the few-layering of c-TMDs also affect their band gap, an effect that is particularly pronounced for group VI 2H c-TMDs. When the layer number is small enough, the interlayer orbital interaction changes with respect from the bulk multilayered material, widening the band gap and transitioning it from indirect to direct. , Due to this peculiarity, few-layered c-TMDs have found a number of applications in the optoelectronic field with remarkable results. , …”

Section: Structure Of Group VI Transition Metal Chalcogenidesmentioning

confidence: 99%

Transition Metal Chalcogenides as a Versatile and Tunable Platform for Catalytic CO₂ and N₂ Electroreduction

et al. 2021

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Group VI transition metal chalcogenides are the subject of increasing research interest for various electrochemical applications such as low-temperature water electrolysis, batteries, and supercapacitors due to their high activity, chemical stability, and the strong correlation between structure and electrochemical properties. Particularly appealing is their utilization as electrocatalysts for the synthesis of energy vectors and value-added chemicals such as C-based chemicals from the CO2 reduction reaction (CO2R) or ammonia from the nitrogen fixation reaction (NRR). This review discusses the role of structural and electronic properties of transition metal chalcogenides in enhancing selectivity and activity toward these two key reduction reactions. First, we discuss the morphological and electronic structure of these compounds, outlining design strategies to control and fine-tune them. Then, we discuss the role of the active sites and the strategies developed to enhance the activity of transition metal chalcogenide-based catalysts in the framework of CO2R and NRR against the parasitic hydrogen evolution reaction (HER); leveraging on the design rules applied for HER applications, we discuss their future perspective for the applications in CO2R and NRR. For these two reactions, we comprehensively review recent progress in unveiling reaction mechanisms at different sites and the most effective strategies for fabricating catalysts that, by exploiting the structural and electronic peculiarities of transition metal chalcogenides, can outperform many metallic compounds. Transition metal chalcogenides outperform state-of-the-art catalysts for CO2 to CO reduction in ionic liquids due to the favorable CO2 adsorption on the metal edge sites, whereas the basal sites, due to their conformation, represent an appealing design space for reduction of CO2 to complex carbon products. For the NRR instead, the resemblance of transition metal chalcogenides to the active centers of nitrogenase enzymes represents a powerful nature-mimicking approach for the design of catalysts with enhanced performance, although strategies to hinder the HER must be integrated in the catalytic architecture.

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Section: Structure Of Group VI Transition Metal Chalcogenidesmentioning

confidence: 99%

Transition Metal Chalcogenides as a Versatile and Tunable Platform for Catalytic CO₂ and N₂ Electroreduction

et al. 2021

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“…For these reasons, there have been enormous efforts to develop photodetectors with new photosensing materials and device architectures for broadband photodetection, such as colloidal quantum dots (QDs) ( 7 ), amorphous oxide semiconductors (AOSs) ( 8 ), organic semiconductors ( 9 ), perovskite materials ( 10 ), and two-dimensional materials (graphene and transition metal dichalcogenides) ( 11 ). In particular, for maximizing the photosensitivity in a broadband range, hybrid device architectures of photodetectors have been largely pursued ( 12 , 13 ).…”

Section: Introductionmentioning

confidence: 99%

A skin-like two-dimensionally pixelized full-color quantum dot photodetector

et al. 2019

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Direct full-color photodetectors without sophisticated color filters and interferometric optics have attracted considerable attention for widespread applications. However, difficulties of combining various multispectral semiconductors and improving photon transfer efficiency for high-performance optoelectronic devices have impeded the translation of these platforms into practical realization. Here, we report a low-temperature (<150°C) fabricated two-dimensionally pixelized full-color photodetector by using monolithic integration of various-sized colloidal quantum dots (QDs) and amorphous indium-gallium-zinc-oxide semiconductors. By introducing trap-reduced chelating chalcometallate ligands, highly efficient charge carrier transport and photoresistor-free fine-patterning of QD layers were successfully realized, exhibiting extremely high photodetectivity (>4.2 × 1017 Jones) and photoresponsivity (>8.3 × 103 A W−1) in a broad range of wavelengths (365 to 1310 nm). On the basis of these technologies, a wavelength discriminable phototransistor circuit array (>600 phototransistors) was implemented on a skin-like soft platform, which is expected to be a versatile and scalable approach for wide spectral image sensors and human-oriented biological devices.

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“…TMDCs are semiconducting 2D materials represented by the formula MX2, where M corresponds to transition metal atom (generally from groups IV-VI) and X indicates a chalcogen atom (S, Se or Te) (Refs. [1][2][3][4]. A TMDCs monolayer has a layered gap structure, where a single layer of M is sandwiched between two layers of X.The intralayer M-X bonds are predominantly covalent, while the layers interact by weak van der Waals forces, which determines the 2D nature of the crystalline phases.…”

Section: Introductionmentioning

confidence: 99%

Molybdenum diselenide thin films grown by atomic layer deposition: An XPS analysis

Rodríguez‐Pereira

Zazpe

Charvot

et al. 2020

Surface Science Spectra

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Molybdenum diselenide (MoSe2) thin films were deposited on annealed titanium foils by Atomic Layer Deposition (ALD) using suitable precursors. In this work, a detailed XPS analysis of the MoSe2 film is presented. Survey spectra, Mo 3d, Se 3d, Mo 3p, Se LMM, Se 3p, C 1s, Se 4s core level along with the valence band spectra were measured. Quantitative analysis indicates a surface composition of MoSe1.8, suggesting a deficiency of selenium on the surface.

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High-performance and scalable metal-chalcogenide semiconductors and devices via chalco-gel routes

Abstract: Chalco-gel–based metal-chalcogenide semiconductors and scalable high-performance electronic devices were demonstrated.

Cited by 55 publications

References 62 publications

Transition Metal Chalcogenides as a Versatile and Tunable Platform for Catalytic CO₂ and N₂ Electroreduction

Transition Metal Chalcogenides as a Versatile and Tunable Platform for Catalytic CO₂ and N₂ Electroreduction

A skin-like two-dimensionally pixelized full-color quantum dot photodetector

Molybdenum diselenide thin films grown by atomic layer deposition: An XPS analysis

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High-performance and scalable metal-chalcogenide semiconductors and devices via chalco-gel routes

Abstract: Chalco-gel–based metal-chalcogenide semiconductors and scalable high-performance electronic devices were demonstrated.

Cited by 55 publications

References 62 publications

Transition Metal Chalcogenides as a Versatile and Tunable Platform for Catalytic CO2 and N2 Electroreduction

Transition Metal Chalcogenides as a Versatile and Tunable Platform for Catalytic CO2 and N2 Electroreduction

A skin-like two-dimensionally pixelized full-color quantum dot photodetector

Molybdenum diselenide thin films grown by atomic layer deposition: An XPS analysis

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Product

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Transition Metal Chalcogenides as a Versatile and Tunable Platform for Catalytic CO₂ and N₂ Electroreduction

Transition Metal Chalcogenides as a Versatile and Tunable Platform for Catalytic CO₂ and N₂ Electroreduction