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退火工艺对于TSV结构热-机械可靠性影响研究

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退火工艺对于TSV结构热-机械可靠性影响研究
Study on Effect of Annealing Process on Thermo-Mechanical Reliability of Cu Through Silicon Via (TSV) Structure
投稿时间:2018-03-15
DOI:10.15918/j.tbit1001-0645.2018.118
中文关键词:三维集成技术硅通孔聚酰亚胺有限元仿真热机械可靠性
English Keywords:three-dimensional integrated technologysilicon through viapolyimidefinite element simulationthermo-mechanical reliability
基金项目:国家自然科学基金资助项目(61574016,61774015)
作者单位
丁英涛北京理工大学 信息与电子学院, 北京 100081
陈志伟北京理工大学 信息与电子学院, 北京 100081
程志强北京理工大学 信息与电子学院, 北京 100081
王一丁北京理工大学 信息与电子学院, 北京 100081
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中文摘要:
针对铜柱穿透硅通孔(through silicon via,TSV)结构的热机械可靠性,进行退火工艺对其影响的有限元分析研究.介绍了基于聚酰亚胺(Polyimide,PI)介质层的TSV结构的加工工艺.比较了在400℃退火温度,保温退火30 min条件下,PI和SiO2分别作为介质层时TSV结构的Von Mises应力及Cu胀出高度的分布.在此基础上,进一步针对PI-TSV结构分别对其尺寸参数(介质层厚度以及TSV直径、高度、间距)和退火工艺参数(退火温度、时间)进行变参分析.结果表明,与SiO2-TSV相比,PI-TSV结构退火后具有更好的热机械可靠性,并且适当增加介质层厚度是降低退火后PI-TSV结构的Cu胀出高度和以及热应力的有效方法.
English Summary:
In this paper, a finite element analysis method was used to study the influence of annealing process on the thermo-mechanical reliability of Cu through-silicon via structure. Firstly, the processing technology of TSV structure with polyimide (PI) dielectric layer was introduced. Then, Von Mises stress distribution and Cu protrusion height of TSV structure, which used PI and SiO2 as the dielectric layer respectively, were compared under 400℃ for 30 min. On this basis, the parameters of PI-TSV were analyzed further, including size parameters of TSV(the thickness of dielectric layer and TSV diameter, height, pitch) and annealing process parameters (annealing temperature and time). The results show that, compared with SiO2-TSV, PI-TSV structure possesses better thermo-mechanical reliability after annealing, and it is an effective method for the Cu protrusion height and thermal stress reduction to appropriately increase the thickness of PI dielectric layer.
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