Semiconductor Thinning via Dopant-Selective Etching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in semiconductor device manufacturing lies in achieving high evenness and reliability of thin semiconductor chips, which is hindered by the inefficiencies in wafer thinning and dicing processes, particularly due to edge damage and material loss associated with existing techniques like sawing and laser cutting.
Innovation Solution
A method involving the transformation of semiconductor substrate areas into dicing areas through etching, where dopant-selective chemical etching is used to remove the semiconductor substrate layer and dicing areas, allowing for precise chip separation without edge damage, and enabling the production of ultra-thin semiconductor chips with controlled thickness variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sawing or laser cutting is used for dicing, then chip separation can be achieved, but edge damage and material loss occur
Solution Approach 1:
The patent replaces mechanical dicing methods (sawing, laser cutting) with a chemical etching process. The etching solution selectively removes material based on dopant concentration, eliminating mechanical contact that causes edge damage and reducing material loss through precise chemical removal only where dopants are present.
Solution Approach 2:
The invention utilizes changes in dopant concentration parameters within the semiconductor substrate to create selective etching zones. By introducing dopants into specific regions, the etching process can distinguish between areas to be removed (dicing areas) and areas to be retained (chip areas), achieving precise separation without mechanical damage.
2Productivity
If conventional dicing methods are used, then chip separation is achieved, but process time and complexity increase
Solution Approach 1:
The patent combines the dicing preparation step (introducing dopants) with the thinning process. The same etching solution that removes the substrate layer also defines the dicing areas by selectively etching dopant-containing regions, merging two separate operations into one integrated process that reduces overall manufacturing time and complexity.
3Length of moving object
If wafer thinning is performed to produce thin chips, then chip thickness is reduced, but total thickness variation increases
Solution Approach 1:
The patent replaces mechanical thinning methods with chemical etching, which provides more uniform material removal. The chemical process acts consistently across the wafer surface, removing material at a controlled rate that maintains better thickness uniformity compared to mechanical methods that can introduce variations due to pressure and contact inconsistencies.
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 minimizes edge damage and material loss, achieving high evenness and reliability in thin semiconductor chips by using dopant-selective chemical etching for chip separation, thereby enhancing the manufacturing efficiency and quality of semiconductor devices.
Implementation Method 1
removing the semiconductor substrate layer and the dicing areas by using etching
Implementation Method 2
transforming areas of the semiconductor device layer into dicing areas which can be removed by etching
Data Source
AI summary
A method of manufacturing a semiconductor device is described. A semiconductor substrate is provided. The semiconductor substrate includes a semiconductor substrate layer and a semiconductor device layer. The method includes transforming areas of the semiconductor device layer into dicing areas which can be removed by etching, and removing the semiconductor substrate layer and the dicing areas by using etching.