Helium-W co-deposition layer: TEM observation and D retention

Kajita, Shin; Asai, Koji; Ohno, Noriyasu; Tanaka, Hirohiko; Yoshida, N.; Nagata, Daisuke; Yajima, Miyuki

doi:10.1016/j.jnucmat.2020.152350

Cited by 7 publications

(4 citation statements)

References 45 publications

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“…In our previous work, impurity seed, deposited on the silicon surface, was considered as a key factor for the nanocone formation [20]. Co-deposition experiment is an effective method to introduce additional species simultaneously with the plasma irradiation [21]. In the present study, uniform black silicon with nanocone structures was formed after irradiating Si samples in helium (He) plasma with auxiliary molybdenum (Mo) co-deposition.…”

Section: Introductionmentioning

confidence: 95%

The dependence of Mo ratio on the formation of uniform black silicon by helium plasma irradiation

Shi¹,

Kajita²,

Feng³

et al. 2021

J. Phys. D: Appl. Phys.

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Reducing the optical reflection of silicon (Si) material is a crucial issue on the surface of solar cells and other photonic applications. Fabrication of nanocone structures on the Si surface (black Si) by plasma (helium or argon) irradiation is a novel technique in recent decades with advantages, such as simple, economical, and harmless to the Si substrate. However, the uniformity and controllability of the surface remain problematic. In this study, uniform black silicon was obtained by low energy (<50 eV) helium ion irradiation with auxiliary Mo co-deposition. The characteristics of the nanocone show a clear relation with the Mo ratio. Deposited Mo was found to accumulate on the cone body, especially on the tip, and it worked as a nano mask to induce the formation of the nanocone and protect it from sputtering. The surface with high and large diameter nanocones possesses low reflectances of roughly 2%. The study of the relation between Mo ratio, characteristics of the nanostructure, and the reflectance of the surface raises a potential method of surface tailoring.

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Section: Introductionmentioning

confidence: 95%

The dependence of Mo ratio on the formation of uniform black silicon by helium plasma irradiation

Shi¹,

Kajita²,

Feng³

et al. 2021

J. Phys. D: Appl. Phys.

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“…Once the NTBs formed on the W surfaces were confirmed, the resulting NTB samples (10 × 5 × 0.2 mm 3 ) were subjected to a vacuum annealing experiment using an IR heating furnace, which has been used for thermal desorption spectroscopy. 19) The schematic of the heating furnace is shown in Fig. 1.…”

Section: Setupmentioning

confidence: 99%

Thermal response of nano-tendril bundles to steady heat load

Xue

Tanaka

Zhang

et al. 2023

Jpn. J. Appl. Phys.

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Nano-tendril bundles (NTBs) are nanostructures formed on the surface of tungsten under helium plasma irradiation with impurities. Upon annealing, NTBs of different sizes exhibit distinct morphological changes. This study aims to elucidate the underlying reasons for the different morphological changes observed in NTBs through the analysis of their thermal responses. A simulation approach was employed to investigate the temperature distribution of NTBs with different heights, aspect ratios, and porosities during annealing experiments. The simulation results revealed varying degrees of impact of height, aspect ratio, and porosity on the temperature distribution of NTBs during annealing. This finding contributes to a better understanding of the thermal properties and reactions of NTBs.

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“…Recently, detailed features of the He-W co-deposition layer within a temperature range from 473 K to 773 K have been revealed from experiments in the linear plasma device Co-NAGDIS [3,4]. It has been found that when the substrate temperature is higher than 1100 K and codeposition is present, mm-scale, fur-like structures called large-scale fiber-form nanostructures (LFNs) form in the device NAGDIS-II device, and such structures are always grown from the edges of samples and expanded in the surface direction [5].…”

mentioning

confidence: 99%

Fuzz Growth Process under He-W Co-Deposition Conditions

SHEN

Kajita

Tanaka

et al. 2022

Plasma and Fusion Research

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Helium (He)-Tungsten (W) co-deposition experiments were conducted in the linear plasma device Co-NAGDIS at a temperature of 1223 K to observe the characteristics of fuzz growth on the W surface with auxiliary W deposition. The dependence on the deposition rate of W was investigated and a clear difference in fuzz thickness was found between He-only and co-deposition experiments. In addition, the fuzz structures on a single sample exhibited a spatially nonuniform distribution, which was probably caused by the nonuniformity in the deposition rate. c

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Helium-W co-deposition layer: TEM observation and D retention

Cited by 7 publications

References 45 publications

The dependence of Mo ratio on the formation of uniform black silicon by helium plasma irradiation

The dependence of Mo ratio on the formation of uniform black silicon by helium plasma irradiation

Thermal response of nano-tendril bundles to steady heat load

Fuzz Growth Process under He-W Co-Deposition Conditions

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