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Effect of the anisotropic characteristics of β-Sn on current-induced solder evolution

[Display omitted] •Current-induced solder evolution was comprehensively explored via in-situ experiments and simulations by considering of β-Sn anisotropy.•The spatial inconsistency between β-Sn distribution and bump geometry led to an accumulation of torsion forces and solder rigid rotation.•The el...

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Published in:Materials & design 2022-12, Vol.224, p.111339, Article 111339
Main Authors: Cao, Huijun, Zhang, Yu, Zhang, Yinggan, Han, Jiajia, Su, Dongchuan, Zhang, Zhihao
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cited_by cdi_FETCH-LOGICAL-c418t-95bf4e69cb555a45192bd21a07f0fbcdae29681fb130d25dcc7809f202de29423
cites cdi_FETCH-LOGICAL-c418t-95bf4e69cb555a45192bd21a07f0fbcdae29681fb130d25dcc7809f202de29423
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container_start_page 111339
container_title Materials & design
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creator Cao, Huijun
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description [Display omitted] •Current-induced solder evolution was comprehensively explored via in-situ experiments and simulations by considering of β-Sn anisotropy.•The spatial inconsistency between β-Sn distribution and bump geometry led to an accumulation of torsion forces and solder rigid rotation.•The electron-dislocation interaction promoted dislocation propagation and slip, leading to solder strengthening and lattice rotation.•The electric fields could accelerate the movement of twin boundaries and promote solder detwinning. The miniaturization trend of three-dimensional integrated circuits poses great challenges to solder reliability under high current stressing since anisotropic issues tend to be enhanced in microscale solder bumps. To address these challenges, the solder evolution at the microscale and the corresponding mechanism should be addressed. In this study, by considering the anisotropy of β-Sn in the electrical, thermal, mechanical and diffusional characteristics, the current-induced solder evolution of a typical solder bump was comprehensively explored over time. The results confirmed that the anisotropy of β-Sn aggravated the nonuniform distribution of current-induced stresses, further causing multiple migration modes coupled in the solder bump. The spatial inconsistency between the distribution of β-Sn unit cells and the bump geometry led to accumulation of torsion forces, which became the direct reason for solder rigid rotation. The electron-dislocation interaction promoted dislocation slip, leading to lattice rotation and homogenization of intragranular deformation. In addition, current-induced grain merging via detwinning was observed, and its velocity was faster than imagined. Our study is conducive to thoroughly understanding anisotropic evolution and establishing accurate damage mechanisms for micro solder bump design under current stressing.
doi_str_mv 10.1016/j.matdes.2022.111339
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The miniaturization trend of three-dimensional integrated circuits poses great challenges to solder reliability under high current stressing since anisotropic issues tend to be enhanced in microscale solder bumps. To address these challenges, the solder evolution at the microscale and the corresponding mechanism should be addressed. In this study, by considering the anisotropy of β-Sn in the electrical, thermal, mechanical and diffusional characteristics, the current-induced solder evolution of a typical solder bump was comprehensively explored over time. The results confirmed that the anisotropy of β-Sn aggravated the nonuniform distribution of current-induced stresses, further causing multiple migration modes coupled in the solder bump. The spatial inconsistency between the distribution of β-Sn unit cells and the bump geometry led to accumulation of torsion forces, which became the direct reason for solder rigid rotation. The electron-dislocation interaction promoted dislocation slip, leading to lattice rotation and homogenization of intragranular deformation. In addition, current-induced grain merging via detwinning was observed, and its velocity was faster than imagined. Our study is conducive to thoroughly understanding anisotropic evolution and establishing accurate damage mechanisms for micro solder bump design under current stressing.</description><identifier>ISSN: 0264-1275</identifier><identifier>EISSN: 1873-4197</identifier><identifier>DOI: 10.1016/j.matdes.2022.111339</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Anisotropy ; Electromigration ; Electron backscatter diffraction (EBSD) ; Grain rotation ; Soldering</subject><ispartof>Materials &amp; design, 2022-12, Vol.224, p.111339, Article 111339</ispartof><rights>2022 The Authors</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c418t-95bf4e69cb555a45192bd21a07f0fbcdae29681fb130d25dcc7809f202de29423</citedby><cites>FETCH-LOGICAL-c418t-95bf4e69cb555a45192bd21a07f0fbcdae29681fb130d25dcc7809f202de29423</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Cao, Huijun</creatorcontrib><creatorcontrib>Zhang, Yu</creatorcontrib><creatorcontrib>Zhang, Yinggan</creatorcontrib><creatorcontrib>Han, Jiajia</creatorcontrib><creatorcontrib>Su, Dongchuan</creatorcontrib><creatorcontrib>Zhang, Zhihao</creatorcontrib><title>Effect of the anisotropic characteristics of β-Sn on current-induced solder evolution</title><title>Materials &amp; design</title><description>[Display omitted] •Current-induced solder evolution was comprehensively explored via in-situ experiments and simulations by considering of β-Sn anisotropy.•The spatial inconsistency between β-Sn distribution and bump geometry led to an accumulation of torsion forces and solder rigid rotation.•The electron-dislocation interaction promoted dislocation propagation and slip, leading to solder strengthening and lattice rotation.•The electric fields could accelerate the movement of twin boundaries and promote solder detwinning. The miniaturization trend of three-dimensional integrated circuits poses great challenges to solder reliability under high current stressing since anisotropic issues tend to be enhanced in microscale solder bumps. To address these challenges, the solder evolution at the microscale and the corresponding mechanism should be addressed. In this study, by considering the anisotropy of β-Sn in the electrical, thermal, mechanical and diffusional characteristics, the current-induced solder evolution of a typical solder bump was comprehensively explored over time. The results confirmed that the anisotropy of β-Sn aggravated the nonuniform distribution of current-induced stresses, further causing multiple migration modes coupled in the solder bump. The spatial inconsistency between the distribution of β-Sn unit cells and the bump geometry led to accumulation of torsion forces, which became the direct reason for solder rigid rotation. The electron-dislocation interaction promoted dislocation slip, leading to lattice rotation and homogenization of intragranular deformation. In addition, current-induced grain merging via detwinning was observed, and its velocity was faster than imagined. 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The miniaturization trend of three-dimensional integrated circuits poses great challenges to solder reliability under high current stressing since anisotropic issues tend to be enhanced in microscale solder bumps. To address these challenges, the solder evolution at the microscale and the corresponding mechanism should be addressed. In this study, by considering the anisotropy of β-Sn in the electrical, thermal, mechanical and diffusional characteristics, the current-induced solder evolution of a typical solder bump was comprehensively explored over time. The results confirmed that the anisotropy of β-Sn aggravated the nonuniform distribution of current-induced stresses, further causing multiple migration modes coupled in the solder bump. The spatial inconsistency between the distribution of β-Sn unit cells and the bump geometry led to accumulation of torsion forces, which became the direct reason for solder rigid rotation. The electron-dislocation interaction promoted dislocation slip, leading to lattice rotation and homogenization of intragranular deformation. In addition, current-induced grain merging via detwinning was observed, and its velocity was faster than imagined. Our study is conducive to thoroughly understanding anisotropic evolution and establishing accurate damage mechanisms for micro solder bump design under current stressing.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.matdes.2022.111339</doi><oa>free_for_read</oa></addata></record>
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source ScienceDirect Journals
subjects Anisotropy
Electromigration
Electron backscatter diffraction (EBSD)
Grain rotation
Soldering
title Effect of the anisotropic characteristics of β-Sn on current-induced solder evolution
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