Semiconductor Defect Isolation via Photoresistor Masking
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Solution Overview
Problem
III-V group material solar cells face significant yield loss due to defects such as pinhole defects and cracks in the epitaxial layer, leading to current leakage and operational issues, especially during the wafer bonding and substrate transferring processes, with existing methods like laser treatment being inefficient in removing residual material.
Innovation Solution
A method involving an apparatus with a coating, exposing, and developing module to detect defects in the epitaxial layer and form a photo-resistor covering the defect area, allowing for precise etching and dielectric layer formation to isolate electrical issues, thereby enhancing semiconductor device yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser is used to burn and remove defects, then defects are removed, but residual material remains causing current leakage
Solution Approach 1:
The patent extracts and removes the harmful residual material generated by laser treatment through chemical etching processes. The multi-step etching method systematically removes laser-induced damage layers and residual materials that would otherwise cause current leakage, while preserving the underlying semiconductor structure.
Solution Approach 2:
The patent introduces chemical etchants as intermediary substances to mediate between the laser-treated surface and the final clean state. These etchants selectively dissolve residual material and damaged layers without affecting the intact semiconductor material, enabling complete removal of harmful residues.
2Productivity
If wafer size increases to meet demand, then production capacity increases, but yield loss from defects increases
Solution Approach 1:
The patent performs preliminary defect detection and targeted removal treatments before final device fabrication. By identifying and addressing defects early in the process on large wafers, the method prevents yield loss during subsequent processing steps, enabling high-capacity production without sacrificing reliability.
Solution Approach 2:
The patent applies local treatment to specific defect locations rather than processing entire wafers uniformly. This localized approach allows large wafers to be processed efficiently while concentrating remediation efforts only where defects exist, maintaining high yield across the entire wafer surface.
3Reliability
If epitaxial growth is performed to create III-V group material, then high conversion efficiency is achieved, but pinhole defects and cracks occur
Solution Approach 1:
The patent converts the harmful effects of pinhole defects and cracks into beneficial outcomes by using them as targets for selective removal and replacement. The defects are identified, removed, and filled with high-quality epitaxial material, transforming previously failed regions into functional areas that contribute to overall device efficiency.
Solution Approach 2:
The patent changes the physical and chemical parameters of the epitaxial growth process to optimize material quality while managing defect formation. By controlling growth conditions such as temperature, pressure, and gas flow, the method minimizes defect formation while maintaining high conversion efficiency in the resulting material.
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 method effectively identifies and addresses defects in the epitaxial layer, reducing yield loss by preventing current leakage and improving the operational reliability of semiconductor devices like solar cells.
Implementation Method 1
detecting and identifying a location of the defect; and etching the dielectric layer and leaving a part of the dielectric layer to cover an area substantially corresponding to the detected defect
Data Source
AI summary
Disclosed is a method for yield enhancement of making a semiconductor device. The method for yield enhancement of making a semiconductor device comprises the steps of: providing the semiconductor device comprising an epitaxial layer including a defect; forming a dielectric layer on the epitaxial layer; detecting and identifying a location of the defect; and etching the dielectric layer and leaving a part of the dielectric layer to cover an area substantially corresponding to the detected defect. The semiconductor device made by the method is also disclosed.