Embedded Heater Biosensor for Uniform Temperature Control
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Solution Overview
Problem
Existing biosensors face challenges with temperature control and uniformity, power consumption, and fluid evaporation due to external heating systems, which affect detection efficiency and cost-effectiveness in applications like PCR and immunoassay.
Innovation Solution
A biosensor with an embedded heater and temperature sensor, where the heater is integrated under the semiconductor substrate and the temperature sensor provides feedback for closed-loop control, ensuring precise and uniform temperature management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an external heating system is used for temperature control, then heating capability is provided, but temperature uniformity deteriorates and power consumption increases
Solution Approach 1:
The heating function is merged with the biosensor chip itself by integrating a heater directly onto the chip substrate. This integration allows the heater to be positioned in close proximity to the reaction chamber, improving thermal efficiency and reducing power consumption compared to external heating systems.
Solution Approach 2:
A temperature sensor is introduced as an intermediary element to enable closed-loop temperature control. The sensor provides real-time feedback to a control circuit, which adjusts the heater power accordingly, achieving precise temperature uniformity and reducing overall power consumption through optimized heating cycles.
2Temperature
If an external heating system is used, then heating function is achieved, but temperature uniformity worsens
Solution Approach 1:
The heater is integrated directly onto the biosensor chip, positioning the heat source in close proximity to the reaction chamber. This eliminates thermal gradients introduced by external heating and ensures uniform temperature distribution across the sensing area.
Solution Approach 2:
A temperature sensor is integrated onto the chip to provide real-time temperature feedback to a control circuit. This closed-loop control system continuously monitors and adjusts the heater output, maintaining precise temperature uniformity during PCR and other thermal cycling applications.
3Temperature
If external heating is used, then heating is provided, but fluid evaporation increases
Solution Approach 1:
The heater is integrated directly onto the biosensor chip, positioning the heat source in close proximity to the reaction chamber. This localized heating reduces the heated volume and minimizes fluid evaporation compared to external heating systems that heat a larger area.
Solution Approach 2:
The integrated temperature sensor provides real-time feedback to control the heater, enabling precise temperature management. This prevents overheating and excessive fluid evaporation by maintaining optimal temperature levels throughout the reaction process.
4Temperature
If external heating system is used, then heating capability is achieved, but detection efficiency deteriorates
Solution Approach 1:
The heater is integrated directly onto the biosensor chip, enabling rapid and efficient heating of the reaction chamber. This integration reduces thermal mass and heating time, improving detection efficiency for time-sensitive applications like PCR and immunoassays.
Solution Approach 2:
The integrated temperature sensor provides real-time feedback to optimize heating cycles, reducing total detection time while maintaining reaction accuracy. This closed-loop control enables faster thermal cycling and improves overall detection throughput.
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 embedded heater and temperature sensor enhance temperature control and uniformity, reduce power consumption, minimize fluid loss, and lower costs by enabling faster and more efficient heating processes.
Implementation Method 1
a heater (102) is under the semiconductor substrate (104)
Implementation Method 2
a temperature sensor (112) is laterally adjacent to the gate electrode (116) of the BioFET (110)
Data Source
AI summary
A biosensor with a heater embedded therein is provided. A semiconductor substrate comprises a source region and a drain region. The heater is under the semiconductor substrate. A sensing well is over the semiconductor substrate, laterally between the source region and the drain region. A sensing layer lines the sensing well. A method for manufacturing the biosensor is also provided.