Patent ID: 7067016

Claim:
A method for post-etch cleaning of a substrate having magnetic random access memory (MRAM) structures defined therein, the method comprising: providing a substrate having MRAM structures being fabricated thereon, the MRAM structures including copper wiring end multiple-tunnel junction (MTJ) structures and materials; inserting the substrate into a first brush box, the first brush box being configured to provide double-sided mechanical cleaning of an active and a backside surface of the substrate; applying a first brush against the active surface of the substrate and applying a second brush against the backside surface of the substrate, the first brush and the second brush being PVA brushes having nodules and being applied at a pressure to achieve brush compression between approximately 1–5 mm; introducing a copper compatible chemistry into the first brush box for cleaning the active and backside surfaces of the substrate; inserting the substrate into a second brush box, the second brush box being configured to provide double-sided mechanical cleaning of the active and backside surfaces of the substrate; applying a first brush of the second brush box against the active surface of the substrate and applying a second brush of the second brush box against the backside surface of the substrate, the first brush of the second brush box and the second brush of the second brush box being PVA brushes having nodules, and being applied at a pressure to achieve a brush compression between approximately 1 and 5 mm; introducing a burst of chemistry into the second brush box; and introducing a deionized water (DIW) rinse into the second brush box, wherein the copper compatible chemistry is ammonia based buffered solution containing chelating agent.