Abstract
The current crowding mechanism is crucial in the modeling of the series resistance in
staggered thin-film transistors, giving the first idea about the current distribution at the
overlap region. However, the model for this mechanism neglects the diffusion phenomenon and is
limited to small drain-voltage condition. In this paper, by using theoretical analysis and
simulations, we introduce a drift-diffusion approach into the interpretation of the current
crowding mechanism, pointing out the dependence of the series resistance not only on the
gate-voltage but also on the current magnitude. In addition, we compare the series resistance at
the source and at the drain, remarking the origin of their difference.
© 2013 IEEE
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