Abstract: A method includes forming a first conductive feature, depositing a passivation layer on a sidewall and a top surface of the first conductive feature, etching the passivation layer to reveal the first conductive feature, and recessing a first top surface of the passivation layer to form a step. The step comprises a second top surface of the passivation layer. The method further includes forming a planarization layer on the passivation layer, and forming a second conductive feature extending into the passivation layer to contact the first conductive feature.

Abstract: A complex type toothbrush includes a push handle, a base, a brush seat and a rotary brush part. The push handle provides a brush handle part joining a push stem with an elongated push groove at the push stem. The base is surrounded with a base edge to form an open top base chamber and is provides a base hole. The brush seat at both ends thereof has a hair seat respectively with each hair seat being attached with brush hairs and at the middle thereof has a circular seat recess with a central brush hole. The rotary brush part provides a rotary brush head with brush hairs at the seat recess and being joined to the push stem for being rotated in a right direction or a reversed direction about an axis of the base hole during the push stem being moved forward or backward.