EUV Lithography Droplet Generator Maintenance for Thermal Stability
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Solution Overview
Problem
The challenge in extreme ultraviolet lithography (EUVL) is maintaining consistent droplet generation for EUV radiation, which is crucial for efficient and stable operation, but current maintenance processes lead to increased downtime due to temperature fluctuations and recalibration needs.
Innovation Solution
A droplet generator maintenance system with a coolant distribution unit and gas supply unit, including a heat exchange assembly and air heating assembly, is used to maintain the nozzle temperature during servicing, ensuring efficient temperature control and reducing downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If maintenance processes are performed on the droplet generator, then servicing is completed, but temperature fluctuations occur causing increased downtime
Solution Approach 1:
The heating assembly pre-heats the gas before it enters the droplet generator during maintenance, and the cooling assembly pre-cools the gas before maintenance. This preliminary temperature preparation prevents temperature fluctuations in the droplet generator during maintenance operations, eliminating the need for recalibration and reducing downtime.
Solution Approach 2:
A gas flow system with heating and cooling assemblies acts as an intermediary between the maintenance environment and the droplet generator. This intermediary gas flow maintains thermal stability of the droplet generator during maintenance by exchanging heat with the generator through controlled gas flow, preventing temperature-induced downtime.
2Reliability
If nozzle temperature is maintained during servicing, then droplet generation stability is preserved, but system complexity increases
Solution Approach 1:
The gas flow system serves multiple functions: it provides cooling during operation, provides heated gas during maintenance to prevent cooling, and acts as a thermal barrier. This multi-functionality maintains droplet generation stability without requiring separate dedicated heating and cooling systems for maintenance, thereby limiting the increase in system complexity.
3Temperature
If rapid cooling is applied to the droplet generator, then temperature reduction is achieved, but temperature instability occurs
Solution Approach 1:
The cooling process uses periodic pulsed gas flow rather than continuous rapid cooling. This periodic action allows the droplet generator to cool in controlled increments with stabilization periods between pulses, achieving rapid overall cooling while maintaining temperature stability and preventing thermal shock to the system.
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
This system reduces EUVL tool downtime by effectively managing temperature fluctuations, thereby enhancing the stability and efficiency of droplet generation for EUV radiation.
Implementation Method 1
A droplet generator maintenance system with a coolant distribution unit and gas supply unit, including a heat exchange assembly and air heating assembly, is used to maintain the nozzle temperature during servicing
Implementation Method 2
The coolant distribution unit may include a booster box configured to receive a forming gas and introduce the forming gas into the droplet generator
Implementation Method 3
The gas supply unit may include a heat exchange assembly and an air heating assembly
Data Source
AI summary
A photolithographic apparatus includes a droplet generator, a droplet generator maintenance system, and a controller communicating with the droplet generator maintenance system. The droplet generator maintenance system operatively communicates with the droplet generator, a coolant distribution unit, a gas supply unit, and a supporting member. The gas supply unit includes a heat exchange assembly and an air heating assembly. The coolant distribution unit is configured to control the temperature of the droplet generator within the acceptable droplet generator range.