Automated Biochip Synthesis With Spin-Cell Reagent Control
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Solution Overview
Problem
Current methods for manufacturing oligonucleotide-based DNA microarrays face challenges such as the need for controlled and inert environments due to air- and moisture-sensitive reagents, high reagent usage, and contamination issues during chemical synthesis on solid surfaces, which complicates the production of custom-made biochips with high fidelity and efficiency.
Innovation Solution
A system comprising a wafer cassette, wafer handling robot, spin cell platform, UV aligner, and mask handling AGV, which automates the synthesis and photolithography process on wafers, reducing reagent volume and minimizing contamination through precise reagent delivery and alignment, enabling high-throughput manufacturing of biochips with de novo synthesized oligonucleotides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated high-throughput synthesis system is implemented, then productivity is improved, but device complexity increases
Solution Approach 1:
The system is divided into distinct functional modules: wafer handling robot for substrate management, spin cell platform for reagent dispensing and mixing, UV aligner for photolithography, and mask handling AGV for pattern transfer. Each module operates independently but coordinates through standardized interfaces, enabling high-throughput synthesis while managing complexity through modular architecture.
Solution Approach 2:
The spin cell platform serves multiple functions: dispensing reagents onto the wafer surface, spinning the wafer to distribute reagents uniformly, and potentially heating or cooling the substrate. The UV aligner performs both alignment and exposure functions. This multi-functionality reduces the number of separate devices needed, improving productivity without proportionally increasing system complexity.
2Manufacturing precision
If precise reagent delivery is used, then manufacturing precision is improved, but loss of substance increases
Solution Approach 1:
The spin cell platform uses controlled fluid dynamics through spinning to distribute reagents uniformly across the wafer surface. The rotation creates centrifugal force that ensures even coating and complete coverage, achieving high manufacturing precision while using minimal reagent volumes. The hydraulic or pneumatic dispensing systems provide precise control over reagent delivery rates and volumes.
Solution Approach 2:
The system changes physical parameters during the synthesis process: rotating speed of the wafer is varied to control reagent distribution, temperature is adjusted to optimize chemical reactions, and UV exposure intensity is controlled for photolithography. These parameter changes enable precise oligonucleotide synthesis with optimized reagent consumption at each process stage.
3Reliability
If automated handling and alignment systems are implemented, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The wafer handling robot automatically picks up wafers, positions them on the spin cell platform, and transfers them between stations without human intervention. The mask handling AGV autonomously navigates and delivers masks to the UV aligner. The wafer centering station automatically centers wafers using optical or mechanical sensing. This self-service capability ensures consistent, high-fidelity synthesis while reducing the skill level required for operation, as the system performs complex alignment and handling tasks automatically.
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 automated system facilitates efficient, high-fidelity synthesis of oligonucleotides on wafers with reduced reagent usage and minimized contamination, enabling the production of custom-made biochips with improved specificity and versatility for genetic analysis and diagnostics.
Implementation Method 1
a spin cell platform, comprising a spin chuck configured to spin a wafer placed on the spin chuck
Implementation Method 2
transferring the wafer from the spin cell to an ultraviolet aligner and performing a photolithography step
Data Source
AI summary
The present disclosure provides methods, device, and system for biochips manufacturing including a wafer processing apparatus such as a spin cell platform, a synthesizer, a wafer handling robot, an ultraviolet aligner, and a wafer centering device. The wafer processing apparatus uses a nozzle in a lid to disperse a solution to the surface of a wafer. Further, the wafer is positioned on top of a vacuum chuck and does not spin while the solution is dispensed over the surface of the wafer via surface tension, thereby permitting the first solution to react with a reagent on the surface. Further, when dispensing the first solution, a separation gap between the lid and the wafer is at a predetermined distance, for example, from about 20 micrometer to about 200 micrometer.