Surface Plasmon Excitation via AuNanoparticles in CdSe Semiconductor

摘要

We present experimental evidence for the large Raman and photoluminescenceenhancement in CdSe semiconductor films grown on Si and glass substrates due toexcitation of surface plasmon resonances in proximate gold metal nanoparticles deposited onthe surface of CdSe film. Heterojunction diodes containing n-CdSe on p-Si semiconductorwere fabricated and the surface of the diodes was in situ coated with Au nanoparticles usingthe ultra-high vacuum pulsed-laser deposition technique. A significant enhancement of thephotocurrent was obtained in CdSe/p-Si containing Au nanoparticles on the surfacecompared to CdSe/p-Si due to the enhanced photo-absorption within the semiconductor bythe phenomenon of surface plasmon resonance. These observations suggest a variety ofapproaches for improving the performance of devices such as photodetectors, photovoltaic,and related devices, including biosensors.