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Measured Hall transport properties of the samples.
Fermi level trends of for bulk and surface pinning values with magnitude of band bending shown.
Measured terahertz emission overlaid with modeled emission values. The transition from surface field to photo-Dember dominance can be clearly seen.
(a) The fitted terahertz model accounting for estimated reduction in effective mobility due to electron velocity saturation in high surface fields and estimated transport characteristic variation across the sample surface. (b) The composite fitted model values overlaid with the measured values. The surface field and photo-Dember models add as the emitted pulse peaks have the same sign.
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