An Effective-Medium TCAD Model of Amorphous In-Ga-Zn-O (a-IGZO) Suitable for Large-Area Devices

IGZO is a disordered material whose transport is typified by percolative flow through a rolling landscape of a spatially-varying conduction-band-edge. Our previous Microscopic TCAD model of a-IGZO replicated percolative flow via directly simulating this spatial variation. However, this is difficult for large-area devices as it requires fine spatial resolution. Here we introduce a new Effective-Medium TCAD model that is shown to be accurate (relative to both the Microscopic model and experiment) in the coarse-gridding and largedevice regime.