Rotary Substrate Turret for High-Throughput Laser-Heated PVD
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Solution Overview
Problem
The bottleneck in physical vapor deposition (PVD) processes is the manual exchange of new growth substrates, which limits the number of samples that can be made in a typical workday due to the time-consuming process of venting and pumping the deposition chamber.
Innovation Solution
A hermetic chamber with a substrate holder assembly that includes a rotating substrate platform with multiple securing stations, a heating laser source, and a control system to automate the substrate exchange, allowing for simultaneous processing of multiple samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual substrate exchange is used, then the deposition chamber can be properly sealed and maintained, but the number of substrates processed per day is limited due to time-consuming venting and pumping operations
Solution Approach 1:
The substrate holder is divided into multiple independent loading stations arranged in a circular pattern, allowing multiple substrates to be prepared and loaded simultaneously. The rotary mechanism segments the substrate processing into discrete positions, enabling parallel preparation while maintaining sequential deposition
Solution Approach 2:
Multiple substrates are pre-loaded onto the rotary substrate holder before entering the deposition chamber. This preliminary loading action eliminates the need for repeated venting and pumping operations during the experiment, as all substrates are already in position when vacuum is established
2Productivity
If multiple substrates are processed simultaneously, then throughput increases, but the complexity of the substrate handling system increases
Solution Approach 1:
The rotary substrate holder serves multiple functions: it holds multiple substrates, rotates to position them sequentially, provides heating to all substrates simultaneously, and maintains vacuum sealing throughout operation. This multi-functionality reduces the need for separate mechanisms for each function
Solution Approach 2:
The substrate holder integrates several components into a single unified structure: the rotating platform, heating elements, vacuum seals, and substrate mounting positions are combined into one assembly that operates as a cohesive unit, simplifying control and maintenance
3Ease of operation
If a rotary substrate holder is used, then multiple substrates can be positioned for laser heating, but the laser beam path must be carefully managed to avoid interfering with the rotation mechanism
Solution Approach 1:
The laser beam is delivered through the central axis of the rotary substrate holder, utilizing the vertical dimension to pass through the rotation mechanism without interference. This axial delivery path allows the laser to reach substrates on all rotating positions without requiring lateral beam manipulation
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
The system increases throughput by enabling autonomous experiments, allowing up to 10 substrates to be processed at once, enhancing the efficiency of PVD processes.
Implementation Method 1
A physical vapor deposition system includes a hermetic chamber with an open interior and an access port, and a heating laser source adapted to direct a laser beam into the open interior
Implementation Method 2
A substrate holder or turret assembly comprises a substrate platform positioned in the open interior and having a plurality of substrate securing stations, and a motor for moving the platform such that each of the substrate securing stations can be positioned to intercept the heating laser beam
Implementation Method 3
The substrate securing plates can include a susceptor region. The susceptor when struck by the laser beam enhances the translation of energy from the laser beam to the substrate securing plates to heat the secured substrate
Implementation Method 4
The physical vapor deposition system can include sensors for sensing characteristics of the physical vapor deposition process. The physical vapor deposition system can include a pyrometer for sensing the temperature of the substrate securing plates
Data Source
AI summary
A physical vapor deposition system includes a hermetic chamber with an open interior and an access port. A heating laser source is adapted to direct a heating laser beam into the open interior. A substrate holder assembly comprises a substrate platform positioned in the open interior and has a plurality of substrate securing stations and a motor for moving the platform. A target assembly retains a target within the open interior. A control system can include a processor for controlling the operation of the heating laser beam and the motor. A shielding member with an opening shields queued substrate securing stations from the physical vapor deposition vapors and allows only the substrate being heated by the heating laser beam to be contacted by the physical vapor deposition vapors. A method of performing physical vapor deposition and a substrate holder assembly also are disclosed.