Vertical Wafer Storage Compartments with Robotic Handling
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Solution Overview
Problem
The challenge in semiconductor wafer storage is to achieve space-saving and contamination-free storage while accommodating increasingly larger wafers, as traditional storage systems require significant space and risk cross-contamination due to their design.
Innovation Solution
A compact storage apparatus with stationary, box-like compartments arranged in rows and columns, featuring a handling unit for automated insertion and removal, and a sealed housing to maintain clean-room conditions, allowing for vertical orientation of wafers with a tight pitch distance, reducing contamination risks and optimizing storage density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional FOUP-based storage systems are used, then wafers can be stored with automated handling, but the storage system requires significant space and has limited storage density
Solution Approach 1:
The patent transitions from horizontal wafer storage in FOUPs to vertical wafer storage in compartments. Wafers are stored upright on holders within vertically-oriented compartments, allowing the storage system to utilize the vertical dimension more effectively. This dimensional change enables higher storage density within the same footprint area while maintaining automated handling capabilities through robotic manipulation of vertically-oriented wafers.
Solution Approach 2:
The storage system is divided into multiple independent compartments, each capable of holding multiple wafers vertically. This segmentation allows for modular configuration where compartments can be arranged in various patterns (e.g., circular, linear) around a central robotic handling unit. Each compartment acts as an independent storage module, enabling flexible system design and optimized space utilization while maintaining automated access to individual wafers.
2Ease of operation
If wafers are stored in open configurations for easy access, then handling is simplified, but cross-contamination risk increases
Solution Approach 1:
The storage system divides the wafer storage environment into multiple isolated compartments. Each compartment is a separate enclosure that can be individually accessed by the robotic handling unit. This segmentation physically isolates wafers from one another, preventing cross-contamination while still allowing rapid access through automated robotic manipulation. The compartments can be configured in various layouts (circular, linear, grid) to optimize both isolation and accessibility.
Solution Approach 2:
A robotic handling unit serves as an intermediary between the external environment and the sealed compartments. The robot transfers wafers between compartments and the external loading/unloading area without requiring direct human access to the storage compartments. This intermediary mechanism maintains the sealed nature of compartments (preventing contamination) while enabling easy automated access to stored wafers through programmable robotic operations.
3Quantity of substance
If vertical wafer storage is implemented to increase density, then storage capacity improves, but handling complexity increases
Solution Approach 1:
The robotic handling unit is designed as a multi-functional device capable of performing multiple operations: picking up wafers from various compartment positions, transferring them between compartments, loading/unloading from external FOUPs, and navigating around different compartment configurations (circular, linear, grid). This universal robot design consolidates what would otherwise require multiple specialized mechanisms, reducing overall system complexity while enabling high-density vertical storage with flexible access patterns.
Solution Approach 2:
The storage system employs dynamic compartment configurations that can be adapted to different wafer quantities and access patterns. Compartments can be arranged in circular patterns around the robot, in linear rows, or in grid configurations, allowing the system to optimize its layout based on specific operational requirements. This dynamic reconfigurability enables high storage density while maintaining simple, predictable robot motion paths for wafer access.
Data Source
AI summary
An apparatus for storing contamination-sensitive flat articles, in particular for storing semiconductor wafers, comprises a plurality of box-like compartments stationary arranged on a fixed mounting rack. The compartments are open on a front side and are arranged in rows and columns side by side and one above the other on the fixed mounting rack. The compartments each have a plurality of slotted holders for receiving the flat articles, and they surround a first handling unit configured for automatically inserting and removing the flat articles into and out of the slotted holders. A closed housing forms a clean room where both the plurality of compartments and the first handling unit are arranged.