Electroabsorption field imaging between coplanar metal contacts on semi-insulating semiconductor epilayers

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Abstract
We use excitonic electroabsorption field imaging to study the electric field distribution between coplanar gold Schottky contacts on semi-insulating photorefractive AlGaAs epilayers. The field imaging shows consistently large localized enhancements of the electric field adjacent to the anode, followed by a region of reduced field. Complex behavior occurs at the cathode, with high-field regions extending far from the contact. These inhomogeneous near-contact field profiles are determined by the superposition of both diffused and drifted charge which affect the performance of many optoelectronic devices that use planar contacts or striplines on semi-insulating substrates.

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