Wafer Carrier Inspection Window for Sealed Emergency Wafer Checks
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Solution Overview
Problem
Current semiconductor wafer transportation systems face challenges in maintaining a hermetic environment during transfer, minimizing contamination and damage, especially during unexpected events like earthquakes, which requires efficient inspection methods to assess wafer condition quickly.
Innovation Solution
The wafer carrier incorporates a bi-state inspection window made of liquid crystal material that switches between opaque and transparent modes, coupled with a sensor and camera system to detect and image wafer conditions, allowing for rapid assessment of semiconductor wafers during emergencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wafer carrier maintains a hermetic sealed environment during transport, then contamination and damage are minimized, but inspection of wafer conditions requires opening the seal which compromises the hermetic protection
Solution Approach 1:
The patent introduces an intermediary inspection window with switchable transparency (using electrochromic or PDLC film technology) that allows optical inspection of wafer conditions while maintaining the hermetic seal integrity. This mediator enables light transmission for inspection purposes without compromising the sealed environment, resolving the contradiction between seal integrity and inspection capability.
Solution Approach 2:
The inspection window's optical parameter (transparency) is made changeable through electrical control, allowing it to switch between transparent and opaque states. This parameter change enables inspection when needed while maintaining opacity for normal operation, thus allowing wafer condition detection without compromising the hermetic seal.
2Reliability
If the inspection window remains opaque during normal operation, then wafer protection is maintained, but rapid inspection during emergencies is delayed
Solution Approach 1:
The inspection window transitions from a static opaque state to a dynamic state where transparency can be rapidly changed via electrical control. This dynamic capability allows the system to adapt quickly during emergencies, switching from protected opaque state to inspectable transparent state in seconds, thus reducing inspection time while maintaining protection during normal operation.
Solution Approach 2:
The switchable transparency feature is pre-configured and ready for immediate activation during emergencies. The inspection capability is prepared in advance through the electrochromic/PDLC film technology, allowing rapid response without delay when emergency inspection is needed, thus reducing loss of time during critical events.
3Reliability
If a traditional opaque window is used, then wafer protection is maintained, but emergency inspection requires opening the carrier which increases contamination risk
Solution Approach 1:
The switchable transparency film acts as an intermediary that provides optical access to wafer conditions without requiring physical opening of the carrier. This mediator enables emergency inspection while the hermetic seal remains intact, thus preventing contamination while improving ease of operation during emergencies.
Solution Approach 2:
The patent replaces the mechanical action of opening the carrier door for inspection with an optical/electrical mechanism (switchable transparency film). This substitution eliminates the need to break the hermetic seal for inspection purposes, thus preventing contamination while providing easy access to wafer condition information during emergencies.
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
Ensures minimal contamination and damage by maintaining a sealed environment and enables quick inspection of wafer conditions during emergencies, reducing downtime and damage assessment in semiconductor manufacturing.
Implementation Method 1
The wafer carrier incorporates a bi-state inspection window made of liquid crystal material that switches between opaque and transparent modes
Data Source
AI summary
A method includes: receiving at least one semiconductor wafer to a wafer carrier, wherein the wafer carrier has an inspection window arranged on a side of the wafer carrier; transporting the wafer carrier between a plurality of semiconductor tools; and in response to an emergent event, switching the inspection window to a transparent mode for a predetermined period.