Quantum Dot Thermal Sensors for High TCR
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Solution Overview
Problem
Thermal image sensors require complex manufacturing processes and high costs due to low temperature coefficient of resistance (TCR) in materials, making it difficult to achieve optimal design for varying operating temperatures.
Innovation Solution
Incorporating quantum dots into the sensing unit of thermal image sensors, which are embedded within a sensing layer made of materials like amorphous silicon or vanadium oxide, to provide variable resistance characteristics and reduce resistivity in response to infrared radiation, thereby simplifying the manufacturing process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermal sensor materials are used, then the sensor structure requires MEMS and high-vacuum packaging, but this increases device complexity and manufacturing cost
Solution Approach 1:
The patent changes the material parameter by incorporating quantum dots with specific size ranges (2-50 nm) into the sensing layer, which fundamentally alters the resistance-temperature relationship. This material parameter change enables high TCR (>2%) without requiring complex MEMS structures or high-vacuum packaging, thus resolving the contradiction between reliability and device complexity
Solution Approach 2:
The patent creates a composite sensing layer by integrating quantum dots (semiconductor particles) into the sensing material matrix. This composite structure combines the properties of the base sensing material with the quantum confinement effects of quantum dots, achieving high temperature coefficient of resistance while simplifying the overall device structure and eliminating the need for MEMS and high-vacuum packaging
2Ease of manufacture
If conventional thermal sensor materials are used, then the manufacturing process is simplified, but the temperature coefficient of resistance is less than 2-3% limiting performance
Solution Approach 1:
The patent changes the material composition parameter by incorporating quantum dots with controlled size (2-50 nm) into the sensing layer. This parameter change increases the temperature coefficient of resistance to greater than 2%, improving sensor performance while maintaining compatibility with existing manufacturing processes that can deposit quantum dot-containing layers
Solution Approach 2:
The patent applies local quality by concentrating quantum dots specifically within the sensing layer region rather than throughout the entire device. This localized modification of material properties achieves high TCR where needed (in the sensing element) while keeping the rest of the device structure and manufacturing process relatively simple
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 use of quantum dots in thermal image sensors allows for high sensitivity across a wide range of temperatures with a high temperature coefficient of resistance (TCR), eliminating the need for complex MEMS structures and high-vacuum packaging, resulting in simpler manufacturing and lower costs while maintaining high performance.
Implementation Method 1
a sensing unit configured to absorb radiation incident on a first surface thereof
Implementation Method 2
Thermal sensors usually use the change in resistance which occurs when temperature increases with absorbed infrared rays
Data Source
AI summary
Integrated circuit devices include thermal image sensors that utilize quantum dots therein to provide negative resistance characteristics to at least portions of the sensors. The thermal image sensor may include a sensing unit configured to absorb radiation incident on a first surface thereof and first and second electrodes electrically coupled to the sensing unit. The sensing unit includes a plurality of quantum dots therein, which may extend between the first and second electrodes. These quantum dots may be configured to impart a negative resistance characteristic to the sensing unit. In particular, the sensing unit may include a sensing layer having first and second opposing ends, which are electrically coupled to the first and second electrodes, respectively, and the plurality of quantum dots may be distributed within the sensing layer.