PDMS Biochip Channel Bonding for Bioreceptor-Safe Fabrication
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Solution Overview
Problem
Existing biochip fabrication processes face challenges due to incompatibility between semiconductor fabrication and biological applications, leading to damage of bioreceptors and surface modification layers, high manufacturing costs, and non-uniform bioreceptor density, making disposable units economically unviable.
Innovation Solution
A wafer-level process that allows surface chemistry and bio-functionalization to occur before bonding the fluidic substrate and sensing wafer at room temperature, using biologically compatible materials and low-temperature bonding to protect delicate bio-materials, and forming fluidic channels separately from the sensing wafer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If semiconductor fabrication processes are used for biochip manufacturing, then manufacturing precision and integration capability are improved, but bioreceptors and surface modification layers are damaged
Solution Approach 1:
The biochip fabrication is divided into separate stages: semiconductor circuit fabrication is completed first, then the fluidic substrate with bioreceptors is bonded to the sensing wafer at low temperature. This segmentation allows high-precision semiconductor manufacturing without exposing bioreceptors to damaging high-temperature processes.
Solution Approach 2:
The semiconductor circuits and fluidic channels are fabricated in advance before the bioreceptors are attached. The fluidic substrate is prepared separately with its channels and structures, then bonded to the sensing wafer at room temperature, preserving the bioreceptors from thermal damage.
2Strength
If high-temperature bonding is used to bond fluidic substrate and sensing wafer, then bonding strength is improved, but bioreceptors and surface modification layers are damaged
Solution Approach 1:
The bonding process is modified by changing the temperature parameter from high-temperature bonding to low-temperature or room-temperature bonding. This parameter change ensures bioreceptor integrity while achieving sufficient bonding strength through alternative bonding mechanisms or materials.
3Ease of manufacture
If conventional fabrication methods are used, then manufacturing capability is improved, but manufacturing costs increase and bioreceptor density becomes non-uniform
Solution Approach 1:
The fabrication process is segmented into modular steps with the fluidic substrate prepared separately and bonded to the sensing wafer. This modular approach enables better control over bioreceptor placement and density uniformity while maintaining manufacturing capability.
4Productivity
If cycle time is reduced for disposable biochip production, then productivity is improved, but manufacturing quality and bioreceptor integrity deteriorate
Solution Approach 1:
Components are prepared in advance and separately, allowing parallel processing that reduces overall cycle time. The fluidic substrate and sensing wafer are fabricated independently, then quickly bonded together, maintaining quality while improving productivity.
Data Source
AI summary
A method of making a biochip includes forming an opening extending completely through a fluidic substrate. Forming the opening includes defining a plurality of sidewalls on the fluidic substrate, wherein the plurality of sidewalls defines a channel in fluid communication with the opening, and each of the plurality of sidewalls comprises polydimethylsiloxane (PDMS). The method further includes coating a surface of the fluidic substrate with a silicon oxide coating wherein, the silicon oxide coating is between adjacent sidewalls of the plurality of sidewalls. The method further includes bonding the fluidic substrate to a detection substrate.