Graphene Wave Detector With Rare Earth Oxide Sensitization
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Solution Overview
Problem
Graphene-based electromagnetic wave detectors have low absorption rates and sensitivity due to their zero or extremely small band gap, limiting their ability to detect electromagnetic waves effectively across a wide wavelength range.
Innovation Solution
Incorporating a rare earth oxide insulating layer with activated rare earth elements into the detector structure, which generates an internal electric field and enhances the sensitivity of the two-dimensional material layer, allowing for high-sensitivity detection by adjusting the activated rare earth element and layer configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If graphene is used as the electromagnetic wave detection layer, then the wavelength range of detectable electromagnetic waves is widened, but the absorption rate becomes very low (a few percent) resulting in low detection sensitivity
Solution Approach 1:
The patent combines graphene with a rare earth element-activated insulating layer to create a composite structure. The insulating layer containing activated rare earth elements (such as europium, terbium, or dysprosium) is positioned adjacent to the graphene layer, enabling the composite material to achieve both wide wavelength detection capability from graphene and high absorption rate from the activated insulating layer, thereby resolving the contradiction between wavelength range and detection sensitivity
Solution Approach 2:
The activated insulating layer acts as an intermediary between the electromagnetic wave and graphene. The rare earth elements in the insulating layer absorb electromagnetic energy and transfer it to graphene, enhancing the overall absorption rate without limiting the wavelength range that graphene can detect. This intermediary mechanism allows the system to achieve high sensitivity while maintaining broad spectral coverage
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 solution significantly improves the detection sensitivity and wavelength selectivity of electromagnetic waves, enabling high-speed and accurate detection across a wide wavelength range without the need for additional optical filters or complex semiconductor materials.
Implementation Method 1
When an electromagnetic wave is incident, an internal electric field is generated in the insulating layer by the activated rare earth element
Implementation Method 2
The rare earth oxide contains a second rare earth element different from the first rare earth element, which is activated in the base material
Implementation Method 3
In the two-dimensional material layer, the mobility of an electron is large and a large current change occurs even with a slight voltage change
Data Source
AI summary
An electromagnetic wave detector 100 comprises: a substrate 5 having a front surface and a back surface; an insulating layer 4 formed of a rare earth oxide, which is provided on the front surface of the substrate 5; a pair of electrodes 2 provided on the insulating layer 4 so as to be arranged to face each other across a gap; and a two-dimensional material layer 1 provided on the insulating layer 4 so as to be electrically connected to the pair of electrodes 2. The rare earth oxide contains a base material made of an oxide of a first rare earth element, and a second rare earth element different from the first rare earth element, which is activated in the base material.