Plasmonic Optical Structure With Alloy Schottky Barrier Tuning
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Solution Overview
Problem
Existing photoelectric conversion technologies using Schottky structures with metal nanostructures on semiconductors face challenges in achieving high efficiency due to high Schottky barriers, which hinder the transport of hot electrons generated by surface plasmon resonance.
Innovation Solution
The proposed optical device incorporates a nanostructure body that induces surface plasmon resonance, an oxide layer, an alloy layer made of a first metal and a second metal with different work functions, and an n-type semiconductor in Schottky contact. This configuration reduces the Schottky barrier and enhances the transport efficiency of hot electrons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a metal nanostructure body is disposed on an n-type semiconductor to achieve surface plasmon resonance, then photoelectric conversion is achieved, but the Schottky barrier is high which hinders hot electron transport
Solution Approach 1:
The metal nanostructure body is segmented into multiple metal nanoparticles with different work functions arranged in a specific pattern. This segmentation allows different regions to contribute differently to hot electron generation and transport, optimizing the overall photoelectric conversion efficiency while managing the Schottky barrier effects.
Solution Approach 2:
Different regions of the metal nanostructure body are designed with different local properties - specifically, metals with different work functions are used in different locations. This creates local variations in electron emission characteristics that enhance hot electron transport across the Schottky barrier while maintaining effective surface plasmon resonance.
2Loss of energy
If a single metal material is used for the nanostructure body, then the structure is simple, but the photoelectric conversion efficiency is limited by the Schottky barrier
Solution Approach 1:
The metal nanostructure body is constructed as a composite material system containing multiple metals with different work functions. This composite structure enables synergistic effects where different metal components contribute to hot electron generation and transport, overcoming the limitations of single-metal Schottky barriers while maintaining structural integrity and plasmonic resonance properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The described optical device achieves enhanced photoelectric conversion efficiency by reducing the Schottky barrier and improving the transport efficiency of hot electrons, enabling effective conversion of light across a wider wavelength range, including near-infrared light.
Implementation Method 1
a nanostructure body which induces surface plasmon resonance when irradiated with light
Implementation Method 2
Hot electrons surmount a Schottky barrier between a metal and a semiconductor, whereby charges are separated and photoelectric conversion is achieved
Data Source
AI summary
An optical device includes a nanostructure body which induces surface plasmon resonance when irradiated with light, an oxide layer which is in contact with the nanostructure body, an alloy layer which is in contact with the oxide layer and which is made of an alloy containing a first metal and a second metal that are different in work function from each other, and an n-type semiconductor which is in Schottky contact with the alloy layer.