Abstract
Metal nanoparticles can generate localized surface plasmon resonance on the metal surface by coupling with incident electromagnetic waves, and the excited surface plasmon can enhance light absorption. We establish a photoemission theoretical model of metal nanoparticle-adsorbed negative electron affinity AlGaN heterojunction nanorod array photocathodes. The adsorbed metal nanoparticles improve the light absorption of the photocathode, while the top-down built-in electric field facilitates the transport of photogenerated carriers within the nanowires. The metal nanoparticles significantly broaden the light absorption range of the photocathode and improve the photoelectric conversion performance. The quantum efficiency of AlGaN heterojunction nanorod photocathodes can be enhanced by up to 214%.
Published Version
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