Photoresist stripping using novel sulfuric/ozone process

Abstract

Sulfuric acid (H/sub 2/SO/sub 4/) and ozone (O/sub 3/) mixture process (SOM) with in-situ concentration monitor for O/sub 3/ and peroxyso-di-sulfuric acid (H/sub 2/S/sub 2/O/sub 8/) was developed Ultraviolet spectrometers with 190-200 nm and 254 nm of wavelength were used to detect H/sub 2/S/sub 2/O/sub 8/ and O/sub 3/ dissolved in SOM, respectively. In order to mix H/sub 2/SO/sub 4/ and O/sub 3/ effectively, the O/sub 3/ gas ejectors were jointed to a quartz bath directly. Using SOM process with UV oxidant monitors and O/sub 3/ gas ejectors, heavily dosed resist and dry etched resist could be removed perfectly without dry ashing process.