Having anti-adhesion coating removed from the engagement device and method

The present invention discloses a joining method and the bonding layer containing no anti-adhesive. An exemplary method includes forming a first bonding layer; forming a spacer is located above the first bonding layer; forming a spacer layer over the anti-adhesive; and forming a first bonding layer and the liquid from the barrier, such that the anti-adhesive layer It floats above the first bonding layer. When the anti-adhesive layer over the first bonding layer floating on a second bonding layer may be bonded to the first bonding layer, so that the engagement between the first bonding layer and the bonding layer does not include a second anti-adhesive layer.