Phase-Change Holding Surface for Precise Substrate Deformation
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Solution Overview
Problem
In semiconductor manufacturing, the miniaturization of devices requires higher accuracy and stability in substrate deformation, which existing actuators like piezoelectric and electrostatic actuators fail to provide due to hysteretic drive characteristics and charge leakage issues.
Innovation Solution
A holding apparatus utilizing a phase change material that undergoes a phase change between amorphous and crystalline phases, with a control unit to heat the material, causing volume changes for precise substrate deformation, thereby addressing the stability and accuracy requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If piezoelectric actuators are used for substrate deformation, then position control capability is provided, but hysteretic drive characteristics and displacement creep change characteristics cause difficulty in achieving highly accurate and stable driving
Solution Approach 1:
The patent changes the physical state/phase of the material used for actuation. Instead of using piezoelectric materials with hysteretic characteristics, the invention employs phase change materials that transition between crystalline and amorphous states, fundamentally changing the actuation mechanism from electric field-driven piezoelectric effect to thermally-driven phase transition, thereby eliminating hysteresis and creep issues
Solution Approach 2:
The patent replaces the piezoelectric mechanical actuation system with a thermal phase change system. The piezoelectric actuator mechanism is substituted by heating elements that induce phase changes in the material, transforming the actuation principle from direct mechanical displacement via electric field to volumetric expansion/contraction via phase transition
2Reliability
If electrostatic actuators are used to maintain position stability, then charge leakage is reduced, but charge leakage cannot be reduced to zero and high stability is still not achieved
Solution Approach 1:
The patent replaces the electrostatic actuation system with a thermal phase change system. Instead of relying on electrostatic forces that suffer from charge leakage, the invention uses thermal heating to induce phase changes in the material, substituting electric field-based actuation with thermally-driven volumetric change, thereby achieving both stability and precision
Solution Approach 2:
The patent directly applies phase transition phenomena to achieve actuation. By heating the phase change material to transition between crystalline and amorphous states, the system achieves controlled volumetric expansion and contraction, providing both position stability and deformation accuracy without the charge leakage problems of electrostatic actuators
3Productivity
If miniaturization of semiconductor devices is pursued, then device density increases, but accuracy requirements for substrate deformation become more severe
Solution Approach 1:
The patent changes the actuation mechanism to phase transition-based volumetric change, which provides more precise and controllable deformation. The phase change material offers reversible, predictable, and highly controllable volume changes in response to temperature variations, enabling the precision required for miniaturized semiconductor devices while maintaining high device density
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
Enables highly accurate and stable control of substrate shape, improving processing accuracy by effectively managing unevenness and distortion through controlled volume changes of the phase change material.
Implementation Method 1
a phase change material arranged in the holding unit or on a holding surface for the object, which undergoes phase change between an amorphous phase and a crystalline phase and changes in volume with the phase change
Implementation Method 2
a control unit configured to control heating of the phase change material using a heating unit configured to heat the phase change material so as to deform the holding surface by causing volume change of the phase change material
Data Source
AI summary
A holding apparatus includes a holding unit configured to hold an object, a phase change material arranged in the holding unit or on a holding surface for the object, which undergoes phase change between an amorphous phase and a crystalline phase and changes in volume with the phase change, and a control unit configured to control heating of the phase change material using a heating unit configured to heat the phase change material so as to deform the holding surface by causing volume change of the phase change material.