Photo-induced currents in Ag-Al2O3-Al structures: Detection characteristics at 325 nm

Abstract

We report the detection characteristics of planar Ag-Al2O3-Al structures at 325 nm as a function of angle, polarization, and bias. The experimental results are in excellent agreement with numerical computations based on a simple model in which the photoinduced currents are assumed to be proportional to the net absorptions in the Ag and Al films of the multilayered structure. Responsivities of the order of 1 V/W, and the simplicity of construction and operation of such metal-barrier structures indicate their usefulness as ultraviolet detectors.