Hi, I think adhesive bonding (BCB, SU8 or dry film) will do. Removal of the Si backside can be done by: KOH etching, DRIE of Si or e= ven grinding of the Si can be performed. Regards, Peter Kuijpers MiPlaza DTS/TFF High Tech Campus 04 Room: WAGp5-11 5656 AE Eindhoven The Netherlands >I have a question on how and what material can be used to bond SiN (waf= er >1) with SiN (wafer 2). Secondly, does anybody know what process can be = used >to totally remove a part of back side Si Wafer without affecting the Si= N >layer at the front side.