Fine pitch micro-bump forming by printing

Abstract

We have examined printing technology which is adaptable to 3DIC bump-forming for (both front-side bump and back-side bump. The materials for bumping require several features for TSV process circumstances and 3DIC stacking followed by reflow. We chose Nano-Function material for the purpose which was initially developed for power semiconductor attachment. The result shows good possibility. 20μm bump pitch capability was confirmed.