Reticle Pod Inspection Window for Early Defect Detection
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Solution Overview
Problem
Existing reticle manufacturing and inspection processes face challenges in detecting pattern defects early and efficiently, which can lead to contamination and damage during the manufacturing and transportation of reticles.
Innovation Solution
A reticle pod with a window in the cover allows for early detection of pattern defects during manufacturing by enabling inspection operations after specific manufacturing steps, reducing contamination risks and facilitating timely repairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealed reticle pod is used to protect and transport reticles, then contamination and damage are reduced, but inspection operations require opening the pod which compromises the sealed environment
Solution Approach 1:
The reticle pod is segmented into a sealed housing and a separate inspection system. The inspection window and imaging device are positioned externally, allowing optical inspection through the sealed enclosure without compromising the protective seal. This segmentation enables independent operation of protection and inspection functions.
Solution Approach 2:
An optical intermediary system (imaging device and window) is introduced as a mediator between the sealed reticle pod and the external inspection environment. This intermediary allows inspection operations to be performed on the reticle patterns without direct access to the sealed interior, maintaining the protective seal while enabling quality control.
2Loss of time
If inspection operations are performed early in the manufacturing process, then defects can be detected sooner, but the reticle must be exposed to external environment increasing contamination risk
Solution Approach 1:
The sealed reticle pod with its integrated window serves as a protective intermediary that enables early inspection without exposing the reticle to external contamination. The imaging device captures images through the window while the reticle remains sealed, allowing defect detection at any manufacturing stage without compromising the protective barrier.
Solution Approach 2:
The reticle pod is designed with inspection capabilities built in from the beginning, allowing inspection operations to be performed at any point during manufacturing or transport. This preliminary preparation of the inspection pathway enables timely defect detection without requiring pod opening or reticle exposure.
3Reliability
If the reticle pod is made completely sealed for protection, then contamination is prevented, but inspection of reticle patterns becomes difficult
Solution Approach 1:
The pod structure is segmented to include a dedicated window region separated from the main sealed housing. This segmentation allows the window to be optimized for optical transmission while the rest of the pod maintains maximum seal integrity. The imaging device is positioned externally to capture patterns through this segmented window area.
Solution Approach 2:
The window material is selected for its optical transmission properties, allowing visible and relevant wavelengths to pass through for pattern inspection. The window may have specific optical characteristics (transparency, reflectivity, or spectral properties) that enable clear imaging of the reticle patterns while maintaining the sealed protective environment.
Data Source
AI summary
A method includes: performing a first inspection on a reticle in a reticle pod, the reticle pod including a sealed space to accommodate the reticle, and the reticle pod further comprising an inspection window, wherein the first inspection is performed through the inspection window with the sealed space keeping sealed; and moving the reticle out of the reticle pod for performing a first operation of a semiconductor device using the reticle in response to determining no defect found on the reticle.