Robustness Improvement of Thermosonic Flip Chip Bonding to Device Chip Tilt
-
- TOMIOKA Taizo
- (株)東芝, 生産技術センター
-
- IGUCHI Tomohiro
- 東芝デバイス&ストレージ(株), ディスクリート半導体事業部
-
- SHOHJI Ikuo
- 群馬大学大学院, 理工学府
Bibliographic Information
- Other Title
-
- 超音波フリップチップボンディングのチップ傾斜に対するロバスト性改善
- チョウオンパ フリップチップボンディング ノ チップ ケイシャ ニ タイスル ロバストセイ カイゼン
Search this article
Abstract
<p>In this paper, we describe the robustness of thermosonic flip chip bonding when the bottom chip is tilted in the chip-on-chip assembly. Experiments were carried out using a bottom chip with 12 Au ball bumps and a top chip with Al pads. A bonding condition that causes gross sliding at the bonding interface was chosen to improve the robustness to chip tilt. The bottom chip was tilted around the axis perpendicular to the direction of the ultrasonic vibration. We found that die-shear force and the sum of the contact area between bumps and the top chip electrodes were constant in spite of tilting of the bottom chip. Although the contact area between each bump and top chip electrode depended on different bonding forces generated by bottom chip tilting, the fractional area of Au-Al alloy of each bonding area became nearly equal. These were caused by the deformation stress of the gold ball bump under the application ofultrasonic vibration being constant in the deformation range in this study.</p>
Journal
-
- Journal of the Japan Society for Technology of Plasticity
-
Journal of the Japan Society for Technology of Plasticity 60 (700), 142-146, 2019
The Japan Society for Technology of Plasticity
- Tweet
Keywords
Details 詳細情報について
-
- CRID
- 1390001288140030208
-
- NII Article ID
- 130007652596
-
- NII Book ID
- AN00135062
-
- ISSN
- 18820166
- 00381586
-
- NDL BIB ID
- 029758200
-
- Text Lang
- ja
-
- Data Source
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- Abstract License Flag
- Disallowed