Tongjun Niu
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Tongjun Niu has a total of 8 co-authors. Here are the top co-authors by number of shared publications:
- Carol A. Handwerker
School of Materials Engineering, Purdue University, West Lafayette, USA
1 shared publication - Chao Shen
School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA
1 shared publication - Ganesh Subbarayan
School of Mechanical Engineering, Purdue University, West Lafayette, USA
1 shared publication - Haiyan Wang
School of Materials Engineering, Purdue University, West Lafayette, USA
1 shared publication - Justin Oberst
Lam Research Corporation, Tualatin, OR 97062, USA
1 shared publication - Ke Xu
School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA
1 shared publication
Latest Publications
- Open Access
In Situ Study on Cu-to-Cu Thermal Compression Bonding
Cu-to-Cu thermal compression bonding (TCB) has emerged as a promising solution for ultrafine pitch packaging in 3D integrated circuit technologies. Despite the progress made by conventional Cu-to-Cu TCB methods in achieving good mechanical strength of the Cu bonds, the bonding processes generally require high temperature and high pressure, which may degrade the performance and reliability of the device. Therefore, it is imperative to investigate the processing parameters to understand the bonding mechanism and achieve effective TCB at a low temperature and low pressure. Here, we developed an in situ TCB technique inside a scanning electron microscope. The in situ TCB method enables a real-time observation of bonding development, which provides critical insights into how the texture and microstructure of Cu bumps may influence the creep and surface diffusion during the bonding process. This work features a strategy to advance our understanding of the bonding mechanisms and provides insight into tailoring the microstructure of Cu for bonding at a low temperature and low pressure.
Open AccessIn Situ Study on Cu-to-Cu Thermal Compression Bonding
Cu-to-Cu thermal compression bonding (TCB) has emerged as a promising solution for ultrafine pitch packaging in 3D integrated circuit technologies. Despite the progress made by conventional Cu-to-Cu TCB methods in achieving good mechanical strength of the Cu bonds, the bonding processes generally require high temperature and high pressure, which may degrade the performance and reliability of the device. Therefore, it is imperative to investigate the processing parameters to understand the bonding mechanism and achieve effective TCB at a low temperature and low pressure. Here, we developed an in situ TCB technique inside a scanning electron microscope. The in situ TCB method enables a real-time observation of bonding development, which provides critical insights into how the texture and microstructure of Cu bumps may influence the creep and surface diffusion during the bonding process. This work features a strategy to advance our understanding of the bonding mechanisms and provides insight into tailoring the microstructure of Cu for bonding at a low temperature and low pressure.