Multi-Zone Wafer Bonding Apparatus with Movable Heater Isolator Plates
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Solution Overview
Problem
Existing wafer bonding technologies are limited in throughput, as they typically bond one wafer pair at a time, which hampers industrial-scale production efficiency and increases device costs.
Innovation Solution
A high-throughput wafer bonding apparatus featuring a multi-pair wafer bonder chamber with multiple chamber zones, heater/isolator plates, and a guide rod system, allowing for simultaneous bonding of multiple wafer pairs under controlled pressure and temperature conditions using piston or gas forces, and incorporating an automatic loader/unloader for increased efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single wafer pair is bonded at a time using a piston-type mechanism, then precise wafer bonding is achieved, but throughput is limited and device cost increases
Solution Approach 1:
The bonding chamber is divided into multiple chamber zones (e.g., 25 zones) that can simultaneously accommodate and bond multiple wafer pairs. Each chamber zone functions as an independent bonding unit, allowing parallel processing of multiple wafer pairs while maintaining precise control over bonding conditions in each zone.
Solution Approach 2:
Multiple chamber zones are merged into a single bonding chamber that can process multiple wafer pairs simultaneously. The heater/isolator plates and guide rod system are shared across all zones, enabling coordinated operation while maintaining individual zone control for precise bonding.
2Productivity
If multiple wafer pairs are bonded simultaneously in a multi-pair chamber, then throughput is enhanced, but maintaining uniform bonding conditions across all zones becomes complex
Solution Approach 1:
The bonding chamber is segmented into multiple independent chamber zones separated by heater/isolator plates. Each zone can accommodate a wafer pair and maintain independent bonding conditions, allowing uniformity to be controlled locally in each zone while enabling high throughput through parallel processing.
Solution Approach 2:
Each chamber zone is equipped with its own heating and isolation capabilities through the heater/isolator plates, allowing bonding conditions (temperature, pressure) to be optimized and controlled locally for each zone. This ensures uniform bonding conditions across all zones despite processing multiple wafer pairs simultaneously.
3Reliability
If heater/isolator plates are made movable and guided by a guide rod system, then chamber zone isolation and pressure application are improved, but device complexity increases
Solution Approach 1:
The heater/isolator plates serve multiple functions: they provide thermal isolation between adjacent chamber zones, apply bonding pressure to wafer pairs when moved by the guide rod system, and can be controlled to move independently or in unison. This multi-functionality reduces the need for separate components for each function.
Solution Approach 2:
The guide rod system acts as an intermediary mechanism that translates actuator motion into precise movement of the heater/isolator plates. The guide rods provide mechanical guidance and support, enabling reliable thermal isolation and pressure application while maintaining a relatively simple overall structure.
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
Enables the simultaneous bonding of a large number of wafer pairs under uniform conditions, enhancing production throughput and reducing costs, particularly suitable for LED applications involving reflective, transparent, or absorptive wafers.
Implementation Method 1
The chamber zones are separated from each other and thermally isolated from each other by the heater/isolator plates
Implementation Method 2
The first pressure means is configured to apply a first force perpendicular to a first end heater/isolator plate. The applied first force causes the heater/isolator plates to move toward each other along the main axis and thereby causes the collapse of each chamber zone volume and the application of bonding pressure onto the wafer pairs
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An industrial-scale high throughput wafer bonding apparatus includes a wafer bonder chamber extending along a main axis and comprising a plurality of chamber zones, a plurality of heater/isolator plates, a guide rod system extending along the main axis, a pair of parallel track rods extending along the main axis, and first pressure means. The chamber zones are separated from each other and thermally isolated from each other by the heater/isolator plates. The heater/isolator plates are oriented perpendicular to the main axis, are movably supported and guided by the guide rod system and are configured to move along the direction of the main axis. Each of the chamber zones is dimensioned to accommodate an aligned wafer pair and the wafer pairs are configured to be supported by the parallel track rods. The first pressure means is configured to apply a first force perpendicular to a first end heater/isolator plate. The applied first force causes the heater/isolator plates to move toward each other along the main axis and thereby causes the collapse of each chamber zone volume and the application of bonding pressure onto the wafer pairs.