A low-cost through via interconnection for ISM WLP |
| |
Authors: | Jingli Yuan Won-Kyu Jeung Chang-Hyun Lim Seung-Wook Park Young-Do Kweon Sung Yi |
| |
Affiliation: | (1) PKG Team, Corporate R&D Institute, Samsung Electro-Mechanics Co., Ltd, 314, Maetan3-dong, Yeongtong-gu, Suwon, Gyunggi-do, South Korea |
| |
Abstract: | Wafer level packaging (WLP) for image sensor device has the advantage of small size, high performance and low cost. In WLP
technology, in order to form electrical interconnection from image sensor contact pad to the backside of the wafer, several
structures have been developed, such as T-contact and through silicon via (TSV). In this paper, a wafer level package of image
sensor with new type TSV electrical interconnection for image sensor pad is presented. The target of this development is to
reduce process cost and difficulty, and increase yield of image sensor packaging. Key fabrication processes includes glass
protecting wafer bonding, device wafer thinning, backside through via etching, via passivation layer deposition, pad oxide
opening, via filling and backside re-routing layer formation, etc. Compared to large opening area of tapered via on the backside
of CMOS image sensor wafer, only small opening area is need for making via interconnection with vertical sidewall presented
in this paper. A fillet structure at bottom corner of via holes can help to reduce sequent process difficulty, so that low-cost
and simplified unit processes are successfully adopted in the fabrication process for through via formation. The through via
interconnection shows good electrical connection performance, and high-quality photo images are obtained by packaged image
sensor device. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|