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Surface Plasmon Resonance in Organic Photovoltaic Cells with Silver or Gold Electrodes

The enhancement of photocurrent in organic photovoltaic cells by excitation of surface plasmon resonance (SPR) is shown to be greater for Ag electrodes than for Au electrodes. Three-layer Al/tin-phthalocyanine/(Ag,Au) photovoltaic cells are fabricated by vacuum evaporation, and the current–voltage characteristics measured with and without excitation of SPR at the metal–dielectric interface. Excitation of SPR increased photocurrent in the Ag-electrode cell by a factor of 5.73, and that in the Au-electrode cell by a factor of 3.78. The intensity of the SPR-induced electric fields responsible for this photocurrent enhancement appears to be dependent on the surface roughness and electrode material.