Influences of Powder Source Porosity on Mass Transport during AlN Crystal Growth Using Physical Vapor Transport Method

We developed a two-dimensional (2D) transport model to investigate mass transport during bulk AlN crystal growth via the physical vapor transport (PVT) process using the finite element method (FEM), taking the powder source porosity, buoyancy, and vapor diffusion into account. The porosity effects o...

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Autores principales:	Danyang Fu, Qikun Wang, Gang Zhang, Zhe Li, Jiali Huang, Jiang Wang, Liang Wu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	computer simulation mass transfer growth from vapor AlN single-crystal growth Crystallography QD901-999
Acceso en línea:	https://doaj.org/article/5e75d43efc974e85be3c1460c617020d
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spelling	oai:doaj.org-article:5e75d43efc974e85be3c1460c617020d2021-11-25T17:19:46ZInfluences of Powder Source Porosity on Mass Transport during AlN Crystal Growth Using Physical Vapor Transport Method10.3390/cryst111114362073-4352https://doaj.org/article/5e75d43efc974e85be3c1460c617020d2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1436https://doaj.org/toc/2073-4352We developed a two-dimensional (2D) transport model to investigate mass transport during bulk AlN crystal growth via the physical vapor transport (PVT) process using the finite element method (FEM), taking the powder source porosity, buoyancy, and vapor diffusion into account. The porosity effects of the powder source on mass transport under various growth conditions were investigated in detail. The simulation results show that the porosity of the powder source significantly affects the mass transport process during AlN sublimation growth. When the porosity of the powder source decreases, the growth rate becomes more uniform along the seed deposition surface, although the sublimation rate and crystal growth rate decrease, which can be attributed to the reduced specific surface area of the powder source and the reduced flow rate of Al vapor in the powder source. A flat growth interface can be achieved at a porosity of 0.2 under our specific growth conditions, which in turn facilitate the growth of high-quality AlN crystals and better yield. The decomposition of the powder source and the transport of Al vapor in the growth chamber can be suppressed by increasing the pressure. In addition, the AlN growth rate variation along the deposition surface can be attributed to the Al vapor pressure gradient caused by the temperature difference in the growth chamber.Danyang FuQikun WangGang ZhangZhe LiJiali HuangJiang WangLiang WuMDPI AGarticlecomputer simulationmass transfergrowth from vaporAlN single-crystal growthCrystallographyQD901-999ENCrystals, Vol 11, Iss 1436, p 1436 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	computer simulation mass transfer growth from vapor AlN single-crystal growth Crystallography QD901-999
spellingShingle	computer simulation mass transfer growth from vapor AlN single-crystal growth Crystallography QD901-999 Danyang Fu Qikun Wang Gang Zhang Zhe Li Jiali Huang Jiang Wang Liang Wu Influences of Powder Source Porosity on Mass Transport during AlN Crystal Growth Using Physical Vapor Transport Method
description	We developed a two-dimensional (2D) transport model to investigate mass transport during bulk AlN crystal growth via the physical vapor transport (PVT) process using the finite element method (FEM), taking the powder source porosity, buoyancy, and vapor diffusion into account. The porosity effects of the powder source on mass transport under various growth conditions were investigated in detail. The simulation results show that the porosity of the powder source significantly affects the mass transport process during AlN sublimation growth. When the porosity of the powder source decreases, the growth rate becomes more uniform along the seed deposition surface, although the sublimation rate and crystal growth rate decrease, which can be attributed to the reduced specific surface area of the powder source and the reduced flow rate of Al vapor in the powder source. A flat growth interface can be achieved at a porosity of 0.2 under our specific growth conditions, which in turn facilitate the growth of high-quality AlN crystals and better yield. The decomposition of the powder source and the transport of Al vapor in the growth chamber can be suppressed by increasing the pressure. In addition, the AlN growth rate variation along the deposition surface can be attributed to the Al vapor pressure gradient caused by the temperature difference in the growth chamber.
format	article
author	Danyang Fu Qikun Wang Gang Zhang Zhe Li Jiali Huang Jiang Wang Liang Wu
author_facet	Danyang Fu Qikun Wang Gang Zhang Zhe Li Jiali Huang Jiang Wang Liang Wu
author_sort	Danyang Fu
title	Influences of Powder Source Porosity on Mass Transport during AlN Crystal Growth Using Physical Vapor Transport Method
title_short	Influences of Powder Source Porosity on Mass Transport during AlN Crystal Growth Using Physical Vapor Transport Method
title_full	Influences of Powder Source Porosity on Mass Transport during AlN Crystal Growth Using Physical Vapor Transport Method
title_fullStr	Influences of Powder Source Porosity on Mass Transport during AlN Crystal Growth Using Physical Vapor Transport Method
title_full_unstemmed	Influences of Powder Source Porosity on Mass Transport during AlN Crystal Growth Using Physical Vapor Transport Method
title_sort	influences of powder source porosity on mass transport during aln crystal growth using physical vapor transport method
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5e75d43efc974e85be3c1460c617020d
work_keys_str_mv	AT danyangfu influencesofpowdersourceporosityonmasstransportduringalncrystalgrowthusingphysicalvaportransportmethod AT qikunwang influencesofpowdersourceporosityonmasstransportduringalncrystalgrowthusingphysicalvaportransportmethod AT gangzhang influencesofpowdersourceporosityonmasstransportduringalncrystalgrowthusingphysicalvaportransportmethod AT zheli influencesofpowdersourceporosityonmasstransportduringalncrystalgrowthusingphysicalvaportransportmethod AT jialihuang influencesofpowdersourceporosityonmasstransportduringalncrystalgrowthusingphysicalvaportransportmethod AT jiangwang influencesofpowdersourceporosityonmasstransportduringalncrystalgrowthusingphysicalvaportransportmethod AT liangwu influencesofpowdersourceporosityonmasstransportduringalncrystalgrowthusingphysicalvaportransportmethod
_version_	1718412473617350656

Influences of Powder Source Porosity on Mass Transport during AlN Crystal Growth Using Physical Vapor Transport Method

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