Wafer Handling System with Angled Intermediate Station
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Solution Overview
Problem
Conventional systems for handling solar cell wafers in the diffusion furnace process are inefficient, leading to high breakage and wastage due to complex and bulky handling systems that fail to accurately position wafers in a back-to-back format, reducing throughput and increasing material costs.
Innovation Solution
A system comprising an unload station, an intermediate station that holds wafers at an angle, and a transfer device with a vacuum gripper and gravity gripper to move and position wafers in a back-to-back arrangement, allowing for efficient handling and processing without direct vertical alignment, which reduces breakage and improves throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional complex handling systems are used to position wafers back-to-back, then wafer positioning accuracy may be improved, but device complexity and space requirements increase significantly
Solution Approach 1:
The handling system is divided into separate functional modules: a carrier for holding multiple wafers, an intermediate carrier for temporary storage, and a transfer mechanism. This segmentation allows each component to be simpler while maintaining overall positioning accuracy through coordinated operation of the modules.
Solution Approach 2:
An intermediate carrier is introduced as a mediator between the source carrier and the destination processing equipment. This intermediate structure simplifies the transfer mechanism by providing a stable holding point, reducing the complexity of direct positioning while maintaining accuracy.
2Productivity
If conventional handling systems are used, then wafer handling can be performed, but throughput is reduced due to handling time and breakage
Solution Approach 1:
The carrier design includes self-aligning features and gravity-assisted positioning that reduce the need for complex active control systems. The wafers are positioned through the inherent geometry of the carrier slots and gravity, minimizing handling time and reducing mechanical interventions that could cause breakage.
Solution Approach 2:
The carrier structure incorporates cushioning elements and compliant positioning features that protect wafers during transfer. These pre-built protective features reduce breakage risk without adding complex active protection systems, thereby improving both reliability and throughput.
3Ease of manufacture
If wafers are handled in conventional manner, then processing can be performed, but material wastage increases due to breakage
Solution Approach 1:
The system changes the physical parameters of wafer support by using angled slots in the intermediate carrier that match the wafer orientation. This parameter change allows wafers to be held at optimal angles for both transfer and processing, reducing stress points and minimizing breakage while maintaining ease of manufacture.
4Manufacturing precision
If complex positioning systems are used, then wafer alignment may be improved, but floor space efficiency decreases
Solution Approach 1:
The intermediate carrier uses angled slots that utilize three-dimensional space more efficiently. By orienting the wafer holding slots at an angle rather than horizontally or vertically, the system achieves precise alignment in a compact footprint, reducing floor space requirements while maintaining alignment accuracy.
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 system effectively reduces wafer breakage and material wastage by enabling precise positioning and handling of solar cell wafers, enhancing manufacturing efficiency and reducing costs through improved handling and processing methods.
Implementation Method 1
The transfer device is provided with a vacuum gripper and a gravity gripper
Implementation Method 2
a gravity gripper configured to support one or more wafers when positioned beneath the wafers and lifted
Data Source
AI summary
A system for handling wafers comprising: at least one unload station; at least one intermediate station designed to hold the wafers at an angle; a processing station; and a transfer device configured to move the wafers between the stations. The intermediate station may be configured to receive the wafers in a back-to-back arrangement. An apparatus for handling wafers comprising: on one side, a vacuum gripper configured to grip individual wafers; and, on the other side, a gravity gripper configured to support one or more wafers when positioned beneath the wafers and lifted. A method for handling wafers, comprising: unloading wafers; transferring the wafers to an intermediate station; transferring the wafers from the intermediate station to a processing station; treating the wafers; unloading the wafers from the processing station; and reloading the wafers in a carrier, wherein the wafers are unloaded, transferred and reloaded by a transfer device.