Tungsten disulfide thin film/p-type Si heterojunction photocathode for efficient photochemical hydrogen production

Kwon, Ki Chang; Choi, Seokhoon; Hong, Kootak; Andoshe, Dinsefa Mensur; Suh, Jun Min; Kim, Chang‐Yeon; Oh, Jeong Hyeon; Kim, Soo Young; Jang, Ho Won; Choi, Kyoung Soon

doi:10.1557/mrc.2017.37

Cited by 29 publications

(12 citation statements)

References 28 publications

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“…There are simple solutions for wettability but because (NH 4 ) 2 WS 4 is weakly coordinated with most of the solvents 24 , the key challenge in making a solution-based uniform ultra-thin WS 2 film is formulating a solution recipe that results in a high solubility of the precursor with the optimum viscosity. Based on this, we chose the most promising solvents reported previously for spin coating, namely (DMF) 27 , ethylene glycol 26 , (NMP) 12 to investigate which one has the maximum solvation and coverage over the substrate.…”

Section: Resultsmentioning

confidence: 99%

“…Although WS 2 has growth methods similar to MoS 2 such as sulphurization of tungsten metal 22 or tungsten oxides 23 , growth of large area and uniform WS 2 ultra-thin films for electronic applications via thermal decomposition of ammonium tetrathiotungstate (NH 4 ) 2 WS 4 salt has not been demonstrated successfully. This is due to the difficulty that is associated with the formation of a thin uniform (NH 4 ) 2 WS 4 precursor layer as this salt has poor solubility in most of the common solvents as compared with (NH 4 ) 2 MoS 4 24 . Usage of these solvents in solution-based single source precursor deposition of WS 2 has however been demonstrated for applications that do not require highly continuous WS 2 films, such as surface enhancement Raman scattering (SERS) and creating a carrier injector layer for optoelectronic devices 25,26 .…”

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confidence: 99%

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Solution-Based Synthesis of Few-Layer WS2 Large Area Continuous Films for Electronic Applications

Abbas

Zeimpekis

Wang

et al. 2020

Sci Rep

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Unlike MoS 2 ultra-thin films, where solution-based single source precursor synthesis for electronic applications has been widely studied, growing uniform and large area few-layer WS 2 films using this approach has been more challenging. Here, we report a method for growth of few-layer WS 2 that results in continuous and uniform films over centimetre scale. The method is based on the thermolysis of spin coated ammonium tetrathiotungstate ((NH 4 ) 2 WS 4 ) films by two-step high temperature annealing without additional sulphurization. this facile and scalable growth method solves previously encountered film uniformity issues. Atomic force microscopy (AFM) and transmission electron microscopy (TEM) were used to confirm the few-layer nature of WS 2 films. Raman and X-Ray photoelectron spectroscopy (XPS) revealed that the synthesized few-layer WS 2 films are highly crystalline and stoichiometric. Finally, WS 2 films as-deposited on SiO 2 /Si substrates were used to fabricate a backgated Field Effect Transistor (FET) device for the first time using this precursor to demonstrate the electronic functionality of the material and further validate the method.FET from an as-deposited WS 2 film grown by our solution based process with an electron mobility reaching 6.2 × 10 −5 cm 2 /V.s which shows comparable performance to MoS 2 devices fabricated by similar synthesis approaches.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Solution-Based Synthesis of Few-Layer WS2 Large Area Continuous Films for Electronic Applications

Abbas

Zeimpekis

Wang

et al. 2020

Sci Rep

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“…More recently, Kwon et al achieved wafer-scale MoS 2 /p-Si and WS 2 /p-Si materials as efficient photocathodes for the PEC-HER. 94,95 In their study, the wafer-scale MoS 2 thin-film exhibited high transparency, which highly depended on the thickness of the thin film. These highly uniform MoS 2 nanosheets with controllable thickness were synthesized by a CVD process and transferred to the surface of p-Si using a wet transferring approach.…”

Section: Catalytic Properties Of Tmdsmentioning

confidence: 99%

Recent advances in two‐dimensional transition metal dichalcogenides as photoelectrocatalyst for hydrogen evolution reaction

Nguyen

et al. 2020

J of Chemical Tech & Biotech

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Hydrogen gas has been attracting significant interest as an emerging energy source that is clean, sustainable, and renewable. Primarily, it can be produced via photoelectrochemical (PEC) splitting of water using solar energy. Among the various catalysts employed for the photoreduction of water, two‐dimensional transition metal dichalcogenides (2D‐TMDs) are inarguably the best candidates toward industrialization because they have extraordinary physical, optical, and electric properties, and are solution‐processable at low costs. In this review, we focus on the development of 2D‐TMDs and their PEC properties toward the hydrogen evolution reaction. First, the synthesis and properties of 2D materials are summarized and discussed. Next, the strategies for improving the photocatalytic activity of the 2D material‐based catalysts for water splitting are thoroughly investigated. Finally, the remaining challenges and direction for the future development of 2D‐TMDs in PEC catalysis‐derived hydrogen evolution reaction are addressed. © 2020 Society of Chemical Industry

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“…Moreover, WS 2 can be utilized as a catalyst in WS 2 /p-type Si photo-cathode hetero-junctions. Kwon et al [ 238 ] examined WS 2 /p-Si photo-cathode for photo-catalytic based HER. Figure 18 a shows the as-prepared WS 2 thin film color changes from yellow to brown with increasing thickness, whereas absorbance of film regularly enhances.…”

Section: Photo-catalytic Applicationsmentioning

confidence: 99%

Recent Progress, Challenges, and Prospects in Two-Dimensional Photo-Catalyst Materials and Environmental Remediation

et al. 2020

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The successful photo-catalyst library gives significant information on feature that affects photo-catalytic performance and proposes new materials. Competency is considerably significant to form multi-functional photo-catalysts with flexible characteristics. Since recently, two-dimensional materials (2DMs) gained much attention from researchers, due to their unique thickness-dependent uses, mainly for photo-catalytic, outstanding chemical and physical properties. Photo-catalytic water splitting and hydrogen (H2) evolution by plentiful compounds as electron (e−) donors is estimated to participate in constructing clean method for solar H2-formation. Heterogeneous photo-catalysis received much research attention caused by their applications to tackle numerous energy and environmental issues. This broad review explains progress regarding 2DMs, significance in structure, and catalytic results. We will discuss in detail current progresses of approaches for adjusting 2DMs-based photo-catalysts to assess their photo-activity including doping, hetero-structure scheme, and functional formation assembly. Suggested plans, e.g., doping and sensitization of semiconducting 2DMs, increasing electrical conductance, improving catalytic active sites, strengthening interface coupling in semiconductors (SCs) 2DMs, forming nano-structures, building multi-junction nano-composites, increasing photo-stability of SCs, and using combined results of adapted approaches, are summed up. Hence, to further improve 2DMs photo-catalyst properties, hetero-structure design-based 2DMs’ photo-catalyst basic mechanism is also reviewed.

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Tungsten disulfide thin film/p-type Si heterojunction photocathode for efficient photochemical hydrogen production

Abstract: Abstract

Cited by 29 publications

References 28 publications

Solution-Based Synthesis of Few-Layer WS2 Large Area Continuous Films for Electronic Applications

Solution-Based Synthesis of Few-Layer WS2 Large Area Continuous Films for Electronic Applications

Recent advances in two‐dimensional transition metal dichalcogenides as photoelectrocatalyst for hydrogen evolution reaction

Recent Progress, Challenges, and Prospects in Two-Dimensional Photo-Catalyst Materials and Environmental Remediation

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