Patent ID: 7169253

Claim:
A system for cleaning and/or photoresist stripping of photomasks comprising: a source of a mixture comprising sulfuric acid and ozone (SOM); a source of a dilute aqueous solution of ammonium hydroxide and hydrogen peroxide (dAPM); first means for supplying the SOM to a photomask; second means for supplying the dAPM to the photomask; means for supplying acoustical energy to the photomask; and a controller adapted to activate the SOM supply means and the acoustical energy supply means so as to supply acoustical energy to the photomask during supply of SOM to the photomask, and subsequent to completing the supply of the SOM and acoustical energy to the photomask, activate the dAPM supply means and the acoustical energy supply means so as to supply acoustical energy to the photomask during supply of dAPM to the photomask.