Growth of environmentally stable transition metal selenide films

Lin, Huihui; Zhu, Qi; Shu, Da-Jun; Lin, Dongjing; Xu, Jie; Huang, Xianlei; Shi, Wei; Xi, Xiaoxiang; Wang, Jiangwei; Gao, Libo

doi:10.1038/s41563-019-0321-8

Cited by 131 publications

(139 citation statements)

References 35 publications

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“…Here, T c was defined as the temperature at R/R n = 0.5. We note that this is the highest T c that has ever been achieved in NbSe 2 thin films grown by MBE or by chemical-vapor deposition [10,[24][25][26][27]. T c of the 5-ML-, 2-ML-, and 1-ML-thick films was determined to be 4.8, 3.6, and 2.8 K, respectively.…”

mentioning

confidence: 70%

Angle dependence of Hc2 with a crossover between the orbital and paramagnetic limits

Matsuoka

Nakano

Shitaokoshi

et al. 2020

Phys. Rev. Research

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A pair-breaking mechanism of a superconductor under magnetic fields, namely, the origin of the upper critical field H c2 , can be categorized into the orbital effect and the paramagnetic effect, which have been separately discussed so far because the physical pictures are totally different. Here we propose a model that unifies these two origins into one formalism with a generalized physical picture. The obtained formula well describes the experimental results on the angle dependence of H c2 in a recently developed noncentrosymmetric superconductor, two-dimensional (2D) NbSe 2 , providing essential information on the spin states of Cooper pairs in 2D NbSe 2 . The proposed model is widely applicable to all superconductors, offering a powerful approach for comprehensive understanding of the origin of H c2 . Superconductivity is usually suppressed by application of external magnetic fields above the upper critical field H c2 . The origins of H c2 are classified into two pair-breaking effects, the orbital effect and the paramagnetic effect. In the limit of the strong orbital effect (the orbital limit), the kinetic energy loss due to the magnetic-field-driven cyclotron motion of electrons causes suppression of superconductivity by forming the vortices or Meissner current. In the paramagnetic limit, on the other hand, superconductivity is suppressed by the energy gain of the spin-aligned paramagnetic state, which exceeds the gain of the condensation energy of the Cooper pairs. Within the framework of the Bardeen-Cooper-Schrieffer (BCS) theory, this paramagnetic limit is called the Pauliparamagnetic limit and is set to be H P = 0

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mentioning

confidence: 70%

Angle dependence of Hc2 with a crossover between the orbital and paramagnetic limits

Matsuoka

Nakano

Shitaokoshi

et al. 2020

Phys. Rev. Research

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“…Taking the two‐dimensional (2D) structure an example, these single‐layer TMSs mostly possess a direct band gap, no inversion center of monolayer (or odd number multilayer) and high freedom charge carriers . These result in their superior mechanical, thermal, optical and electrical properties . As we known, higher electrical conductivity can reduce the Schottky barriers between both the interfaces of electrode‐catalyst and catalyst‐electrolyte, speeding up the charge transfer rate and increasing the energy conversion efficiency…”

Section: Application Of Transition Metal Selenides In Hermentioning

confidence: 99%

Transition Metal Selenides for Electrocatalytic Hydrogen Evolution Reaction

et al. 2019

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Electrolysis of water is regarded as an attractive and feasible way for producing hydrogen. So far, various non‐noble metal nanomaterials have been reported as excellent electrocatalysts for hydrogen evolution reaction. Especially, due to the low cost, earth‐abundance and tunable properties, transition metal selenides with different compositions, sizes and structures have been explored broadly as efficient catalysts with the relatively high activities, high stabilities and high efficiencies in full pH range of electrolyte for electrochemical hydrogen evolution reaction. Thus, in this Minireview, after introducing several commonly used electrochemical terms about hydrogen evolution reaction, we mainly focus on various kinds of the transition metal selenides that have been documented as electrocatalysts for hydrogen evolution reaction. Particularly, the merits and demerits of transition metal selenides for hydrogen evolution reaction are systematically discussed. Moreover, we also analyze the encountered challenges and present an outlook for the rapid development of transition metal selenides. We hope this Minireview can bring some fundamental understanding for the readers interested in the transition metal selenides and hydrogen evolution reaction.

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“…Multistep processes can also be an effective synthesis strategy in making multinary oxychalcogenides, such as LaCuOS, 114 in which initial deposition is followed by postdeposition annealing in reactive or nonreactive atmospheres and allows control of the phases formed at each processing step. 137,138 In the case of oxychalcogenides, controlled oxidation could be a third synthesis step. It is important to note that the order sulfurization (selenization) + oxidation or oxidation + sulfurization (selenization) should be determined based on the formation energy and binding energy of the competing binary phases.…”

Section: Mixed-anion Materialsmentioning

confidence: 99%

Bridging the p-type transparent conductive materials gap: synthesis approaches for disperse valence band materials

Fioretti

Morales‐Masis

2020

J. Photon. Energy

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Transparent conductive materials (TCMs) with high p-type conductivity and broadband transparency have remained elusive for years. Despite decades of research, no p-type material has yet been found to match the performance of n-type TCMs. If developed, the high-performance p-type TCMs would lead to significant advances in a wide range of technologies, including thin-film transistors, transparent electronics, flat screen displays, and photovoltaics. Recent insights from high-throughput computational screening have defined design principles for identifying candidate materials with low hole effective mass, also known as disperse valence band materials. Particularly, materials with mixed-anion chemistry and nonoxide materials have received attention as being promising next-generation p-type TCMs. However, experimental demonstrations of these compounds are scarce compared to the computational output. One reason for this gap is the experimental difficulty of safely and controllably sourcing elements, such as sulfur, phosphorous, and iodine for depositing these materials in thin-film form. Another important obstacle to experimental realization is air stability or stability with respect to formation of the competing oxide phases. We summarize experimental demonstrations of disperse valence band materials, including synthesis strategies and common experimental challenges. We end by outlining recommendations for synthesizing p-type TCMs still absent from the literature and highlight remaining experimental barriers to be overcome.

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Growth of environmentally stable transition metal selenide films

Cited by 131 publications

References 35 publications

Angle dependence of Hc2 with a crossover between the orbital and paramagnetic limits

Angle dependence of Hc2 with a crossover between the orbital and paramagnetic limits

Transition Metal Selenides for Electrocatalytic Hydrogen Evolution Reaction

Bridging the p-type transparent conductive materials gap: synthesis approaches for disperse valence band materials

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