dPCR Detection Chip Electrode Layout for Precise Thermal Control
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Solution Overview
Problem
Existing PCR technologies are bulky, complex, and costly, with dPCR products being difficult to produce at scale due to silicon-based manufacturing, leading to high costs and complicated processes.
Innovation Solution
A detection chip with a heating electrode design featuring distinct electrode portions of varying resistance values, integrated with micro-reaction chambers and hydrophilic/hydrophobic layers, allowing efficient temperature control and sample handling, compatible with semiconductor production lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If silicon-based manufacturing is used for dPCR chips, then detection accuracy can be maintained, but production complexity and cost increase significantly
Solution Approach 1:
The heating electrode is divided into multiple independent heating zones, each corresponding to a micro-reaction chamber. This segmentation allows independent temperature control for each chamber, enabling precise thermal management while using standard semiconductor fabrication processes instead of complex silicon-based manufacturing.
Solution Approach 2:
Different regions of the electrode are designed with different resistance values to create localized heating characteristics. The first electrode portion has higher resistance for stronger heating, while the second electrode portion has lower resistance for weaker heating or cooling, allowing optimized temperature control in different areas of the chip.
2Ease of manufacture
If uniform electrode design is used, then manufacturing is simpler, but temperature control precision deteriorates
Solution Approach 1:
The electrode incorporates regions with different resistance values (first electrode portion with higher resistance, second electrode portion with lower resistance) to provide localized heating and cooling capabilities. This allows different parts of the micro-reaction chamber to have different thermal characteristics, improving temperature control precision while maintaining compatibility with standard manufacturing processes.
Solution Approach 2:
The resistance value of the electrode is varied across different regions through changes in electrode thickness or material composition. The first electrode portion has greater thickness or higher resistivity for stronger heating, while the second electrode portion has lesser thickness or lower resistivity for weaker heating, enabling precise temperature control without complicating the overall manufacturing process.
3Manufacturing precision
If hydrophilic treatment is applied to micro-reaction chambers, then sample distribution improves, but manufacturing steps increase
Solution Approach 1:
The inner walls of the micro-reaction chambers are pre-treated with hydrophilic substances during the manufacturing process. This preliminary treatment ensures that when the reaction solution is introduced, it automatically distributes uniformly across all chambers without requiring additional manual intervention, thereby improving sample distribution while adding only one manufacturing step.
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
Facilitates accurate, efficient, and cost-effective large-scale production of dPCR chips with improved temperature control and sample handling, enhancing detection accuracy and throughput.
Implementation Method 1
a heating electrode on the first substrate and closer to the first substrate than the micro-cavity definition layer, configured to release heat after being energized
Implementation Method 2
a hydrophilic layer, and the hydrophilic layer covers a sidewall and a bottom of each of the plurality of micro-reaction chambers
Implementation Method 3
a hydrophobic layer, and the hydrophobic layer covers a spacing region between the plurality of micro-reaction chambers in the micro-cavity definition layer
Data Source
AI summary
A detection chip, a method for manufacturing a detection chip, a method for operating a detection chip, and a reaction system are disclosed. The detection chip includes a first substrate, a micro-cavity definition layer, and a heating electrode. The micro-cavity definition layer defines a plurality of micro-reaction chambers. The heating electrode is configured to release heat after being energized. The heating electrode includes a first electrode portion and at least one second electrode portion. Orthographic projections of the plurality of micro-reaction chambers on the first substrate are within an orthographic projection of the first electrode portion on the first substrate, the orthographic projections of the plurality of micro-reaction chambers on the first substrate do not overlap with an orthographic projection of the second electrode portion on the first substrate, and a resistance value of the first electrode portion is greater than a resistance value of the second electrode portion.