Internal photoemission in Ag-Al2O3-Al junctions

We report a detailed study of the magnitude of the photon-induced current in Ag-Al
2
O
3
-Al metal-oxide-metal junctions as a function of photon energy and angle of incident radiation. Experimental observations and a theory based on vacuum photoemission are found to be in good agreement. Fast risetimes (
\lsim50
ns) and linearity of the photocurrent with respect to incident power up to at least 10 kW/cm
²
are also reported.