Temperature dependence of nitrogen dissolution on Na flux growth

Tandryo, Ricksen; Murakami, Kosuke; Okumura, Kanako; Yamada, Takumi; Kitamura, Tomoko; Imanishi, Masayuki; Yoshimura, Masashi; Mori, Yusuke

doi:10.1016/j.jcrysgro.2020.125549

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…Gejo et al 9 introduced bottom heating in their experiments and found that the generation of thermal convection had a significant effect on the increase of the growth rate and concluded that thermal convection can produce higher nitrogen transfer rates. Tandryo et al 10 investigated the temperature dependence of nitrogen dissolution during Na melt growth by measuring the change in Ga–Na melt resistance under nitrogen pressure. Their studies all show that nitrogen transfer plays an important role in the growth of GaN crystals by the Na-flux method.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Temperature Field Optimization to Enhance Nitrogen Transfer in GaN Crystal Growth by the Na-Flux Method

et al. 2023

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Improved nitrogen transport is crucial for enhancing the growth rate of GaN crystals using the Na-flux method. This study investigates the nitrogen transport mechanism during the growth of GaN crystals by the Na-flux method using a combination of numerical simulations and experiments. The results indicate that the temperature field affects the effect of nitrogen transfer, and we propose a novel bottom ring heating approach to optimize the temperature field and enhance nitrogen transfer during the growth of GaN crystals. The simulation results demonstrate that optimizing the temperature field improves nitrogen transfer by causing convection within the melt to float up from the crucible wall and sink at the crucible center. This enhancement improves the nitrogen transfer from the gas–liquid interface to the GaN crystal growth surface, thereby accelerating the growth rate of GaN crystals. Additionally, the simulation results indicate that the optimized temperature field substantially reduces polycrystalline generation at the crucible wall. These findings are also a realistic guide to the growth of other crystals in the liquid phase method.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Temperature Field Optimization to Enhance Nitrogen Transfer in GaN Crystal Growth by the Na-Flux Method

et al. 2023

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“…To that end, efforts have been made to introduce electrical probes into the melt allowing for resistive measurements of the melt (see also Figure 7) from which information can be gleaned on the amount of dissolved nitrogen in the melt and the melt alloy composition, or optical access and direct line of sight to the melt is afforded though the development of an optical window aligned with a condenser column (see Figure 6 and envision replacing the thermocouple fitting with a transparent window fitting) providing the means both interrogate the vapor phase above the melt and the melt itself. 85 Both the ammonothermal and the flux growth methods require a considerable amount of engineering to be repeatable and reliable. While the flux growth method generally uses somewhat higher temperatures, the easing of the pressure requirements appears to outweigh the temper-ature concerns in opening the engineering process space allowing for the development of more sophisticated in situ monitoring technologies which could be integrated into the growth control process or learning about metastable phases which may appear during growth.…”

Section: Flux Growthmentioning

confidence: 99%

“…Having access to information of the melt and vapor conditions, beyond just the system pressure, is critical to accelerate application of this method for new material synthesis. To that end, efforts have been made to introduce electrical probes into the melt allowing for resistive measurements of the melt (see also Figure 7) from which information can be gleaned on the amount of dissolved nitrogen in the melt and the melt alloy composition, or optical access and direct line of sight to the melt is afforded though the development of an optical window aligned with a condenser column (see Figure 6 and envision replacing the thermocouple fitting with a transparent window fitting) providing the means to both interrogate the vapor phase above the melt and the melt itself 85 …”

Section: Flux Growthmentioning

confidence: 99%

Prospective view of nitride material synthesis

Stoddard

Pimputkar

2023

Int J Ceramic Engine & Sci

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The field of nitride‐based materials is producing some of the most promising and interesting candidates for advanced technology applications. Novel formulations and polymorphs are of interest for applications requiring one or more of: high hardness, high oxygen resistance at elevated temperatures, catalytic action, semiconductor light sources, and (ultra‐)wide band gap electronics. The synthesis of nitrides with excellent single crystal structural quality of an appreciable size is challenging whether working in solution growth techniques like ammonothermal and flux growth, or in vapor deposition techniques. This paper presents a perspective on recent developments in equipment and techniques for single crystal nitride synthesis with a view toward progress anticipated in the next 5–10 years.

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