Laser Lift-Off Wafer Separation Detection for Alignment Control
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Solution Overview
Problem
Existing substrate processing systems fail to accurately detect whether substrates are separated after laser light radiation, leading to potential misalignment and unintentional separation of wafers during the laser lift-off process.
Innovation Solution
A substrate processing system equipped with a substrate holder, driving and rotating mechanisms, a laser radiator, and a detecting mechanism to form a separation surface and monitor the substrate for misalignment before and after laser light radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser light is radiated to form a separation surface, then substrate separation is enabled, but unintentional wafer misalignment and separation may occur during the process
Solution Approach 1:
The detecting mechanism performs preliminary detection of wafer position and separation state before the actual separation is completed. By detecting the separation surface formation and wafer displacement in advance, the system can identify unintentional separation early and take corrective actions, preventing misalignment issues from developing
Solution Approach 2:
The detecting mechanism provides real-time feedback on wafer position and separation status during the laser processing. This feedback loop allows the control mechanism to monitor for unintentional separation and adjust processing parameters or halt operations to maintain manufacturing precision while enabling reliable separation
2Measurement precision
If a detecting mechanism is added to monitor substrate separation, then separation detection accuracy is improved, but system complexity increases
Solution Approach 1:
The detecting mechanism is designed to perform multiple functions: detecting wafer position, identifying separation surface formation, and monitoring separation progress. By consolidating these detection capabilities into a single integrated mechanism rather than separate devices, the system achieves high measurement precision while minimizing the increase in overall system complexity
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 precise detection of substrate separation, preventing unintentional wafer misalignment and ensuring controlled separation of wafers during the laser lift-off process.
Implementation Method 1
a laser radiator configured to radiate laser light to the substrate held on the holding surface to form a separation surface serving as a starting point for separation of the substrate
Data Source
AI summary
A substrate processing system of processing a substrate includes a substrate holder having a holding surface on which the substrate is to be held, a driving mechanism for moving the substrate holder in a horizontal direction, a rotating mechanism for rotating the substrate holder, a laser radiator for radiating laser light to the substrate held on the holding surface to form a separation surface serving as a starting point for separation of the substrate, and a detecting mechanism for detecting the separation starting from the separation surface in the substrate held by the substrate holder.