FWIW, I did an experiment back in school that showed a suspiciously sqrt(t) dependancy in a one of those thingys. Supposedly I was supposed to measure R ~ t, but seemingly the larger voltage swing in my experimental setup did otherwise.
Do you do any modelling on amorphous or poly semis?
I wouldn't be surprised if there's something about trap states on grain boundaries, or ionic activation and diffusion for that matter.
Tim
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