Alloy Nanoparticle Schottky Junction for Near-Infrared Detection

The patent applies local quality by creating a core-shell structure where the metal core maintains plasmonic characteristics while the shell layer reduces the Schottky barrier. Specifically, a first metal nanoparticle (with plasmonic properties) is covered with a second metal film (with low work function), allowing each layer to perform its specialized function locally without compromising the other.

The patent uses composite materials by combining two different metals in a core-shell configuration. The composite structure integrates the plasmonic properties of the first metal with the low work function characteristics of the second metal, achieving both improved photoelectric conversion efficiency and maintained plasmonic response.

The patent employs cheap short-living objects by using inexpensive metal materials for the nanoparticle core and shell layers. The structure uses readily available metals that can be deposited through cost-effective techniques, avoiding the need for expensive rare metals while maintaining functional performance.

The patent applies parameter changes by optimizing the thickness and composition parameters of the metal layers. By carefully controlling the shell thickness to be thin enough to allow plasmonic field penetration while thick enough to provide sufficient work function reduction, the structure achieves improved efficiency without requiring expensive thick metal deposits.

The patent uses an intermediary approach by introducing a protective shell layer around the low work function metal core. This shell acts as a mediator that prevents direct contact between the reactive low work function metal and oxygen, thereby preventing oxidation while still allowing the core to perform its electron injection function.

The patent applies flexible shells and thin films by using a thin metal film shell that is sufficiently thin to allow optical field penetration and electron transport but thick enough to provide oxidation protection. This thin film structure maintains the functional requirements while providing environmental stability.