Octopus-pot model

Octopus-Pot Model. Honda et al 32) proposed that the high ortho-ortho structure of novolac allows multiple phenols to bind to the DNQ carbonyl, thus, blocking developer diffusion into the resist. The lipophilic backside of the polymer forms a hydrophobic pot while the DNQ PAC rests atop the pot resembling an octopus (Figure 5). The hydrogen bonding of the novolac to the DNQ carbonyl was observed by infrared spectroscopy. In terms of percolation theory, the active sites of the polymer are blocked, which effectively lowers the percolation parameter, p. 

Figure 5. The Octopus-pot model (Reproduced with permission from reference 32. Copyright 1990 K. Honda)...

---