Transparent Wafer Carrier Cover for Accurate Reticle Field Marking
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Solution Overview
Problem
Conventional semiconductor wafer carriers are inefficient and unreliable for marking reticle fields on semiconductor wafers due to susceptibility to contamination and damage, and the difficulty in accurately seeing and marking surface details.
Innovation Solution
A transparent wafer cover with a reticle template and grid is used to align and mark semiconductor wafer field areas, preventing direct contact and contamination while enhancing visibility and accuracy through alignment with the grid and reticles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lab operator manually marks field areas on the semiconductor wafer, then the marking process can be completed, but the delicate surface coatings are exposed to contamination and damage
Solution Approach 1:
A transparent cover with reticle template is introduced as an intermediary between the operator and the wafer surface. The operator marks the template rather than directly contacting the wafer, eliminating direct exposure of delicate surface coatings to contamination and damage while still enabling field area identification and marking.
2Difficulty of detecting and measuring
If the wafer is held up to a light source or viewed under dark field microscopy to see surface features, then surface details become visible, but the process becomes slow and time-consuming
Solution Approach 1:
The reticle template on the transparent cover serves as a copy or representation of the wafer's field area layout. Instead of directly observing and interpreting complex surface features under microscopy, the operator simply aligns and marks the template, dramatically reducing detection time while maintaining accuracy.
3Measurement precision
If field areas are marked by visually counting and identifying them under microscopy, then field areas can be located, but miscounting and incorrect markings occur due to difficulty seeing surface details
Solution Approach 1:
The reticle template provides a simplified copy of the field area configuration that is easily visible and countable. The template's clear geometric representation eliminates the difficulty of seeing and counting surface features, ensuring accurate field area identification and marking without miscounting errors.
4Ease of operation
If conventional wafer carriers are used for marking, then the wafer can be held and marked, but the process is costly, time-consuming, and unreliable
Solution Approach 1:
The transparent cover with reticle template acts as a reliable intermediary that protects the wafer while enabling accurate marking. This system eliminates the unreliability of direct manual marking by providing a controlled interface that prevents contamination and damage, ensuring consistent and trustworthy marking results.
Data Source
AI summary
A wafer carrier assembly comprising a wafer carrier having a first and second side, the first side including: a circular recess configured to receive a semiconductor device wafer, and at least one cut-out arranged along the circumference of the circular recess. The first side also includes a carrier cover having a top and bottom side, the top side including: a plurality of gridlines extending to edges of the carrier cover, and a plurality of reticles extending from the top side to the bottom side where subsets of reticles are arranged to have a common center and each subset of reticles is arranged at each intersection of the plurality of gridlines.