Electromagnetic Wave Detector With Thermoelectric Phase-Change Layers

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Solution Overview

Problem

Existing electromagnetic wave detectors using graphene as a two-dimensional material layer suffer from insufficient sensitivity due to low quantum efficiency of semiconductor layers, particularly at certain wavelengths.

Innovation Solution

The electromagnetic wave detector incorporates a heat-absorbing layer composed of a thermoelectric material layer and a phase-transition material layer, with an insulating film and a two-dimensional material layer connected to a first electrode portion, enhancing sensitivity through improved absorption and resistance changes in response to electromagnetic waves.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a semiconductor layer is used for electromagnetic wave detection, then the detector can operate at specific wavelengths, but the quantum efficiency is insufficient leading to low detection sensitivity

Engineering Contradiction:

Improvedetection sensitivityVSAvoidquantum efficiency

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent combines a two-dimensional material layer (such as graphene) with a semiconductor layer to form a composite detection structure. The two-dimensional material layer compensates for the insufficient quantum efficiency of the semiconductor layer, enabling high-sensitivity detection across broader wavelength ranges while maintaining the semiconductor's wavelength-selective operation capability

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The two-dimensional material layer serves multiple functions: it enhances quantum efficiency for electromagnetic wave absorption, maintains wavelength selectivity through its material properties, and provides high mobility for carrier transport. This multi-functionality resolves the contradiction between wavelength-specific operation and sufficient detection sensitivity

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Speed

If graphene is used as the two-dimensional material layer, then high mobility is achieved, but the absorptivity is extremely low at only 2.3%

Engineering Contradiction:

Improvecarrier mobilityVSAvoidelectromagnetic wave absorption

Core Design Contradiction:

SpeedVSLoss of energy

Solution Approach 1:

The patent creates a composite structure where the two-dimensional material layer (graphene) is combined with a semiconductor layer. The semiconductor layer provides strong electromagnetic wave absorption capability, compensating for graphene's low absorptivity, while graphene maintains its high carrier mobility advantage for efficient charge transport

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent merges the advantages of two different materials: the high mobility of graphene and the strong absorption capability of the semiconductor. By forming a integrated structure where both materials work together, the detector achieves both high carrier speed and sufficient electromagnetic energy absorption

Inventive Principle:

Principle #5Merging (Combining)

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 detector achieves enhanced sensitivity by utilizing the heat-absorbing layer to increase absorption and generate voltage changes, improving detection capabilities across various wavelengths.

Implementation Method 1

The heat-absorbing layer includes a thermoelectric material layer and a phase-transition material layer

Methodology Applied

Scientific EffectSeebeck effect: Seebeck Effect

Implementation Method 2

The heat-absorbing layer includes a thermoelectric material layer and a phase-transition material layer

Methodology Applied

Scientific EffectPhase transition: Phase Change

Implementation Method 3

the resistance value of the two-dimensional material layer changes, thereby the fermi level of the two-dimensional material layer changes

Methodology Applied

Scientific EffectResistive detection: Electrical Resistance

Data Source

PatentUS20250327704A1Electromagnetic wave detector and electromagnetic wave detector array

Publication Date: 2025.10.23 MITSUBISHI ELECTRIC CORP

AI summary

An electromagnetic wave detector includes a heat-absorbing layer, an insulating film, a two-dimensional material layer, and a first electrode portion. The heat-absorbing layer includes a thermoelectric material layer and a phase-transition material layer. The insulating film is disposed on part of the heat-absorbing layer. The two-dimensional material layer is disposed on the heat-absorbing layer and the insulating film and is electrically connected to the heat-absorbing layer. The first electrode portion is disposed on the insulating film and is electrically connected to the heat-absorbing layer with the two-dimensional material layer in between.