Fluorescence Microscopy for Semiconductor Polymer Residue Detection
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Solution Overview
Problem
Current methods for analyzing polymer residues on semiconductor elements are either time-consuming, costly, and often destructive, making it difficult to inspect and remove residues, especially with increasing aspect ratios, which can lead to poor adhesion of subsequent layers and reduced device yield.
Innovation Solution
A non-destructive method using a fluorescent substance to mark and visualize polymer residues on semiconductor elements through fluorescence microscopy, allowing for efficient detection and analysis of residue distribution and density without damaging the semiconductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inspection methods (scanning electron microscopy) are used to analyze polymer residues, then measurement precision is improved, but productivity deteriorates due to time-consuming and costly procedures
Solution Approach 1:
The patent replaces complex mechanical/electronic microscopy systems with a chemical-fluorescence based detection system. By using fluorescent substances that bind to polymer residues and detecting them through fluorescence microscopy, the method achieves high detection precision while dramatically improving throughput and reducing costs compared to scanning electron microscopy
Solution Approach 2:
The patent introduces fluorescent substances as intermediary agents that mediate between the polymer residues and the detection system. These fluorescent markers bind specifically to polymer residues, converting invisible or difficult-to-detect residues into brightly fluorescent signals that can be rapidly detected and quantified, thereby resolving the contradiction between detection precision and inspection efficiency
2Measurement precision
If destructive inspection methods are used to analyze polymer residues, then measurement precision is improved, but reliability deteriorates due to damage to the semiconductor element
Solution Approach 1:
The patent replaces destructive mechanical or chemical etching methods with a non-destructive fluorescence-based optical detection method. The fluorescent substances bind reversibly or can be removed without damaging the semiconductor structure, allowing precise residue detection while preserving the integrity of the semiconductor element for subsequent processing
Solution Approach 2:
The fluorescent substances serve as temporary intermediary markers that can be applied, detected, and then removed or left without harm. This intermediary approach enables precise measurement of polymer residues without the need for destructive sampling, thereby maintaining semiconductor element reliability
3Manufacturing precision
If thorough polymer residue removal is performed to improve adhesion, then manufacturing precision is improved, but productivity deteriorates due to increased process complexity and time
Solution Approach 1:
The patent implements a feedback mechanism where fluorescence microscopy detection provides real-time or near-real-time information about polymer residue levels. This feedback allows process engineers to optimize cleaning parameters, determine when sufficient removal has been achieved, and avoid excessive or unnecessary cleaning steps, thereby maintaining high adhesion quality while improving manufacturing throughput
Solution Approach 2:
The patent enables preliminary assessment of polymer residue levels before subsequent deposition processes. By detecting and quantifying residues in advance, the system allows for targeted cleaning interventions only when necessary, preventing unnecessary process steps and maintaining productivity while ensuring adequate adhesion preparation
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 approach enables rapid, efficient, and non-destructive analysis of polymer residues, improving device yield by allowing further layers to be deposited on the semiconductor element post-analysis, and effectively addressing the challenges of residue detection in complex surface structures.
Implementation Method 1
A residue with the luminous substance sticking thereto emits light upon excitation by ultraviolet light
Implementation Method 2
Modification of the optical properties of fluoropolymers by supercritical fluid impregnation with europium β-diketonates
Implementation Method 3
fluoropolymer films exhibit intense red photoluminescence upon supercritical fluid impregnation with europium β-diketonates
Data Source
Figure 1~3
Figure 4~6B
AI summary
According to the improved concept, a method for analyzing a semiconductor element (SE) comprising polymer residues (RS, RB) located on a surface of the semiconductor element (SE) is provided. The method comprises marking at least a fraction of the residues (RS, RB) by exposing the semiconductor element (SE) to a fluorescent substance and detecting the marked residues (RS, RB) by visualizing the marked residues (RS, RB) on the surface of the semiconductor element (SE) using fluorescence microscopy.