In the present paper, continuum fracture mechanics is used to analyze the Smart-Cut process, a recently established ion cut technology which enables highly efficient fabrication of various silicon-on-insulator （SOI）...In the present paper, continuum fracture mechanics is used to analyze the Smart-Cut process, a recently established ion cut technology which enables highly efficient fabrication of various silicon-on-insulator （SOI） wafers of high uniformity in thickness. Using integral transform and Cauchy singular integral equation methods, the mode-I and mode-II stress intensity factors, energy release rate, and crack opening displacements are derived in order to examine several important fracture mechanisms involved in the Smart-Cut process. The effects of defect interaction and stiffening wafer on defect growth are investigated. The numerical results indi- cate that a stiffener/handle wafer can effectively prevent the donor wafer from blistering and exfoliation, but it slows down the defect growth by decreasing the magnitudes of SIF＇s. Defect interaction also plays an important role in the splitting process of SOI wafers, but its contribution depends strongly on the size, interval and internal pressure of defects. Finally, an analytical formula is derived to estimate the implantation dose required for splitting a SOI wafer.展开更多
In Part 2 of the paper on the Smart-Cut process, the effects of bonding flaws characterized by the size and internal pressure before and after splitting are studied by using fracture mechanics models. It is found that...In Part 2 of the paper on the Smart-Cut process, the effects of bonding flaws characterized by the size and internal pressure before and after splitting are studied by using fracture mechanics models. It is found that the bonding flaws with large size are prone to cause severe deviation of defect growth, leading to a non-transferred area of thin layer when splitting. In a practical Smart-Cut process where the internal pressure of bonding flaws is very small, large interfacial defects always promote defect growth in the splitting process. Meanwhile, increasing the internal pressure of the bonding flaws decreases the defect growth and its deviation before splitting. The mechanism of relaxation of stiffener constraint is proposed to clarify the effect of bonding flaws. Moreover, the progress of the splitting process is analyzed when bonding flaws are present. After splitting, those bonding flaws with large size and high internal pressure are vulnerable for the blistering of the thin film during high-temperature annealing.展开更多
The hydrogen ion implantation process in Smart-Cut technology is investigated in the present paper using molecular dynamics（MD） simulations.This work focuses on the effects of the implantation energy,dose of hydroge...The hydrogen ion implantation process in Smart-Cut technology is investigated in the present paper using molecular dynamics（MD） simulations.This work focuses on the effects of the implantation energy,dose of hydrogen ions and implantation temperature on the distribution of hydrogen ions and defect rate induced by ion implantation.Numerical analysis shows that implanted hydrogen ions follow an approximate Gaussian distribution which mainly depends on the implantation energy and is independent of the hydrogen ion dose and implantation temperature.By introducing a new parameter of defect rate,the influence of the processing parameters on defect rate is also quantitatively examined.展开更多
A SOI material with thick BOX (2.2 μm) was successfully fabricated using the Smart-cut technology. The thick BOX SOI microstructures were investigated by high resolution cross-sectional transmission electron microsco...A SOI material with thick BOX (2.2 μm) was successfully fabricated using the Smart-cut technology. The thick BOX SOI microstructures were investigated by high resolution cross-sectional transmission electron microscopy (XTEM), while the electrical properties were studied by the spreading resistance profile (SRP). Experimental results demonstrate that both structural and electrical properties of the SOI structure are very good.展开更多
Defect evolution in a single crystal silicon which is implanted with hydrogen atoms and then annealed is investigated in the present paper by means of molecular dynamics simulation. By introducing defect density based...Defect evolution in a single crystal silicon which is implanted with hydrogen atoms and then annealed is investigated in the present paper by means of molecular dynamics simulation. By introducing defect density based on statistical average, this work aims to quantitatively examine defect nucleation and growth at nanoscale during annealing in Smart-Cut technology. Research focus is put on the effects of the implantation energy, hydrogen implantation dose and annealing temperature on defect density in the statistical region. It is found that most de- fects nucleate and grow at the annealing stage, and that defect density increases with the increase of the annealing temperature and the decrease of the hydrogen implantation dose. In addition, the enhancement and the impediment effects of stress field on defect density in the annealing process are discussed.展开更多
针对当前机械加工领域工艺优化效率低下、严重依赖人工经验的问题,提出了基于几何-物理-运动协同仿真的智能机床工艺自主优化方法。首先,构建了几何模型,实现数字化表达工件与刀具,重构切削的材料去除过程;其次,建立了基于神经网络的物...针对当前机械加工领域工艺优化效率低下、严重依赖人工经验的问题,提出了基于几何-物理-运动协同仿真的智能机床工艺自主优化方法。首先,构建了几何模型,实现数字化表达工件与刀具,重构切削的材料去除过程;其次,建立了基于神经网络的物理模型,完成了切削刃的力-热载荷解析,实现了切削力与刀具磨损的精准预测;最后,搭建机床运动模型,分析运动链与五轴联动过程,约束刀尖点(tool center point,TCP)与刀轴矢量变化。在此基础上,基于几何-物理-运动协同仿真模型提出工艺自主优化方法,根据周期迭代优化机制与梯度下降法自主迭代工艺参数,并在航空发动机叶片上进行了验证实验。结果表明,该方法能针对不同加工目标实现工艺优化,具有较高的适用性与优化效率。展开更多
基金the Australian Research Council (ARC),the National Natural Science Foundation of China (10525210 and 10732050) 973 Project (2004CB619303)
文摘In the present paper, continuum fracture mechanics is used to analyze the Smart-Cut process, a recently established ion cut technology which enables highly efficient fabrication of various silicon-on-insulator （SOI） wafers of high uniformity in thickness. Using integral transform and Cauchy singular integral equation methods, the mode-I and mode-II stress intensity factors, energy release rate, and crack opening displacements are derived in order to examine several important fracture mechanisms involved in the Smart-Cut process. The effects of defect interaction and stiffening wafer on defect growth are investigated. The numerical results indi- cate that a stiffener/handle wafer can effectively prevent the donor wafer from blistering and exfoliation, but it slows down the defect growth by decreasing the magnitudes of SIF＇s. Defect interaction also plays an important role in the splitting process of SOI wafers, but its contribution depends strongly on the size, interval and internal pressure of defects. Finally, an analytical formula is derived to estimate the implantation dose required for splitting a SOI wafer.
基金supported by the Australian Research Council (ARC), the National Natural Science Foundation of China (10525210 and 10732050) 973 Project (2004CB619303)
文摘In Part 2 of the paper on the Smart-Cut process, the effects of bonding flaws characterized by the size and internal pressure before and after splitting are studied by using fracture mechanics models. It is found that the bonding flaws with large size are prone to cause severe deviation of defect growth, leading to a non-transferred area of thin layer when splitting. In a practical Smart-Cut process where the internal pressure of bonding flaws is very small, large interfacial defects always promote defect growth in the splitting process. Meanwhile, increasing the internal pressure of the bonding flaws decreases the defect growth and its deviation before splitting. The mechanism of relaxation of stiffener constraint is proposed to clarify the effect of bonding flaws. Moreover, the progress of the splitting process is analyzed when bonding flaws are present. After splitting, those bonding flaws with large size and high internal pressure are vulnerable for the blistering of the thin film during high-temperature annealing.
基金Project supported by the National Natural Science Foundation of China(No.11372261)the Excellent Young Scientists Supporting Project of Science and Technology Department of Sichuan Province(No.2013JQ0030)+3 种基金the Supporting Project of Department of Education of Sichuan Province(No.2014zd3132)the Opening Project of Key Laboratory of Testing Technology for Manufacturing Process,Southwest University of Science and Technology-Ministry of Education(No.12zxzk02)the Fund of Doctoral Research of Southwest University of Science and Technology(No.12zx7106)the Postgraduate Innovation Fund Project of Southwest University of Science and Technology(No.14ycxjj0121)
文摘The hydrogen ion implantation process in Smart-Cut technology is investigated in the present paper using molecular dynamics（MD） simulations.This work focuses on the effects of the implantation energy,dose of hydrogen ions and implantation temperature on the distribution of hydrogen ions and defect rate induced by ion implantation.Numerical analysis shows that implanted hydrogen ions follow an approximate Gaussian distribution which mainly depends on the implantation energy and is independent of the hydrogen ion dose and implantation temperature.By introducing a new parameter of defect rate,the influence of the processing parameters on defect rate is also quantitatively examined.
基金Supported by the National Natural Science Foundation of China(No.69906005)and the Shanghai Youth Foundation(No.01 QMH1403)
文摘A SOI material with thick BOX (2.2 μm) was successfully fabricated using the Smart-cut technology. The thick BOX SOI microstructures were investigated by high resolution cross-sectional transmission electron microscopy (XTEM), while the electrical properties were studied by the spreading resistance profile (SRP). Experimental results demonstrate that both structural and electrical properties of the SOI structure are very good.
基金Project supported by the National Natural Science Foundation of China(No.11372261)the Excellent Young Scientists Supporting Project of Science and Technology Department of Sichuan Province(No.2013JQ0030)+3 种基金the Supporting Project of Department of Education of Sichuan Province(No.2014zd3132)the Opening Project of Key Laboratory of Testing Technology for Manufacturing Process,Southwest University of Science and Technology-Ministry of Education(No.12zxzk02)the Fund of Doctoral Research of Southwest University of Science and Technology(No.12zx7106)the Postgraduate Innovation Fund Project of Southwest University of Science and Technology(No.14ycxjj0121)
文摘Defect evolution in a single crystal silicon which is implanted with hydrogen atoms and then annealed is investigated in the present paper by means of molecular dynamics simulation. By introducing defect density based on statistical average, this work aims to quantitatively examine defect nucleation and growth at nanoscale during annealing in Smart-Cut technology. Research focus is put on the effects of the implantation energy, hydrogen implantation dose and annealing temperature on defect density in the statistical region. It is found that most de- fects nucleate and grow at the annealing stage, and that defect density increases with the increase of the annealing temperature and the decrease of the hydrogen implantation dose. In addition, the enhancement and the impediment effects of stress field on defect density in the annealing process are discussed.
文摘针对当前机械加工领域工艺优化效率低下、严重依赖人工经验的问题,提出了基于几何-物理-运动协同仿真的智能机床工艺自主优化方法。首先,构建了几何模型,实现数字化表达工件与刀具,重构切削的材料去除过程;其次,建立了基于神经网络的物理模型,完成了切削刃的力-热载荷解析,实现了切削力与刀具磨损的精准预测;最后,搭建机床运动模型,分析运动链与五轴联动过程,约束刀尖点(tool center point,TCP)与刀轴矢量变化。在此基础上,基于几何-物理-运动协同仿真模型提出工艺自主优化方法,根据周期迭代优化机制与梯度下降法自主迭代工艺参数,并在航空发动机叶片上进行了验证实验。结果表明,该方法能针对不同加工目标实现工艺优化,具有较高的适用性与优化效率。
