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1 June 1992 Experimental investigation of a novel dissolution model
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Mack recently proposed a new kinetically based 5-parameter model for positive photoresist bulk dissolution. The present work tests its physical assumptions by comparing its predictions with DRM measurements of seven different PAC/novolak formulations, each at several different PAC loadings. Although substantial qualitative agreement between the predictions and experiments is seen, quantitative agreement is poor. The most likely explanations for the quantitative difficulties are: (1) the assumptions that inhibition by the PAC and enhancement by the photo-acid can be treated independently and multiplicatively, apparently fail, (2) side reactions and intermediates are neglected by the model, and (3) complex PAC isomeric distributions and associated complex inhibition/enhancement effects are also neglected. The dissolution rate equation derived by the model does exhibit excellent flexibility in fitting actual bulk dissolution rate curves. This reason alone is sufficient to recommend its inclusion in commonly used simulation programs such as PROLITH/2 and SAMPLE. the present work shows that significant errors can result in simulations by using simple dissolution rate equation which are unable to accurately describe observed bulk dissolution data.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Medhat A. Toukhy, Steven G. Hansen, Rodney J. Hurditch, and Chris A. Mack "Experimental investigation of a novel dissolution model", Proc. SPIE 1672, Advances in Resist Technology and Processing IX, (1 June 1992);

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