Self-alignment observation and conductivity evaluation in micro chips integration with square binding pattern

A "square" binding alignment pattern, with relatively higher energy barrier but four fully aligned orientations at four off-set angles of 0A degrees, 90A degrees, 180A degrees, and 270A degrees, has been analyzed by introducing a concept of the overlap ratio, compared to a "rectangular" one. Both the "square-pattern" micro-chips and the substrate with the "square-pattern" binding sites were fabricated using one-mask micromachining process, and the self-alignment in situ observation under three different off-set orientation angles of 35A degrees, 46A degrees, and 90A degrees was demonstrated using a high-speed video camera. Sequential images reveal a slow translational motion in the early stage followed by a faster rotational alignment. A novel technique has been further proposed for the conductivity evaluation by using three kinds of SAM films, i.e., C12, C18, and Terphenyl. The preliminary measurements indicate that, using the proposed novel structure, the Terphenyl film is believed to be desirable as a conductive SAM film for self-alignment of micro-chips.