Reticle Stage Scanning Profiles for Pellicle Membrane Protection
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Solution Overview
Problem
The challenge in photolithography processes is the deformation and potential damage of pellicle membranes due to pressure and acceleration during high-speed reticle movement, leading to image distortion and reduced pellicle lifespan, which affects manufacturing yield and efficiency.
Innovation Solution
A photolithography apparatus with a control unit that manages scanning speed and acceleration profiles based on pellicle membrane deformation data, minimizing damage and extending pellicle lifespan by optimizing reticle stage movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed reticle movement is used to increase productivity, then manufacturing efficiency improves, but pellicle membrane deformation and damage occur
Solution Approach 1:
The patent implements dynamic acceleration management by adjusting the reticle stage acceleration profile in real-time based on pellicle membrane condition monitoring. The system transitions from fixed acceleration to variable acceleration control, where the acceleration magnitude is dynamically adapted to prevent membrane damage while maintaining high productivity when conditions permit.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor pellicle membrane status and use this information to adjust acceleration profiles. The control unit receives data about membrane deformation and modifies subsequent acceleration commands accordingly, creating a closed-loop control system that balances productivity with membrane protection.
2Loss of time
If high acceleration is applied to the reticle stage to reduce cycle time, then productivity increases, but pellicle membrane damage risk increases
Solution Approach 1:
The patent changes the acceleration parameter dynamically based on monitored conditions. Instead of using a constant high acceleration value, the system adjusts the acceleration parameter in response to pellicle membrane status, allowing high acceleration when safe and reducing it when damage risk is detected, thereby optimizing both time and safety.
Solution Approach 2:
The system applies cushioning by reducing acceleration before critical damage thresholds are reached. The monitoring and control system anticipates potential damage and proactively adjusts acceleration levels to prevent membrane failure, rather than reacting after damage occurs.
3Duration of action of stationary object
If pellicle membrane is protected from deformation, then lifespan increases, but scanning speed must be reduced
Solution Approach 1:
The system makes scanning speed dynamic rather than static. The reticle stage operates at variable speeds adjusted in real-time based on pellicle membrane condition monitoring. This allows the system to maintain high scanning speeds when the membrane is healthy and reduce speeds when deformation risk increases, optimizing both lifespan and throughput.
Solution Approach 2:
The monitoring and speed adjustment operates continuously throughout the exposure process. Rather than discrete speed reductions, the system maintains continuous adaptation of scanning speed to membrane conditions, ensuring maximum productive action at every moment while protecting the membrane.
4Reliability
If acceleration management is implemented to prevent pellicle damage, then manufacturing yield improves, but system complexity increases
Solution Approach 1:
The system implements self-service by using the pellicle membrane's own response characteristics to guide acceleration management. The monitoring system detects membrane deformation and the control system automatically adjusts acceleration accordingly, allowing the membrane to participate in its own protection process rather than requiring external complex control.
Solution Approach 2:
The control unit performs multiple functions: it monitors pellicle membrane status, determines deformation levels, adjusts acceleration profiles, and maintains productivity optimization. By consolidating these functions in a single multi-functional control system, the patent reduces overall system complexity compared to having separate dedicated systems for each function.
Data Source
AI summary
A photolithography apparatus and a method for operating the photolithography apparatus are provided. The method includes steps of receiving a reticle assembly comprising a reticle protected by a pellicle membrane; transporting the reticle assembly to an exposure tool and securing the reticle assembly on a reticle stage of the exposure tool; determining a scanning speed profile based on a risk level rupture of the pellicle membrane; and preforming an exposure operation by driving the reticle stage according to the scanning profile.