Epitaxial Semiconductor Recess Layers for Etch Protection
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Solution Overview
Problem
The processing of semiconductor substrates often results in unintended material loss, which affects the manufacturing of semiconductor devices and requires new methods to minimize this loss.
Innovation Solution
A method involving the epitaxial formation of a doped semiconductor material within a recess in a substrate, followed by the epitaxial growth of an undoped semiconductor material over the recess, and optionally including a third layer, to enhance material retention and prevent etch-induced losses during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional processing methods are used to manufacture semiconductor devices, then manufacturing processes can be completed, but unintended material loss occurs from the semiconductor substrate
Solution Approach 1:
An epitaxial layer is formed over the semiconductor substrate before subsequent processing steps. This preliminary layer acts as a protective barrier that prevents material loss during etching and other processing operations, while still allowing the manufacturing process to proceed efficiently
Solution Approach 2:
The epitaxial layer serves as an intermediary between the semiconductor substrate and the processing environment. It absorbs the harmful effects of etching and processing, protecting the underlying substrate material from unintended loss while enabling the manufacturing process to continue
2Manufacturing precision
If etching processes are performed to pattern semiconductor layers, then circuit components are formed, but material loss occurs from the substrate
Solution Approach 1:
The epitaxial layer functions as a mediator during etching processes. It allows precise patterning to be achieved while the layer itself absorbs the material loss, protecting the underlying semiconductor substrate from unintended etching damage
Solution Approach 2:
The etching process that would normally cause harmful material loss is converted into a beneficial selective removal process. The epitaxial layer is selectively etched to create precise patterns while protecting the substrate, turning potential damage into a useful patterning mechanism
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 increases selectivity during etching, protects the underlying layers from material loss, and prevents contact resistance penalties by allowing controlled removal of the epitaxial layers, thereby improving the efficiency and quality of semiconductor device production.
Implementation Method 1
epitaxially forming a first layer including a doped semiconductor material within the recess
Implementation Method 2
epitaxially forming a second layer including an undoped semiconductor material over at least a portion of the recess
Data Source
AI summary
Semiconductor devices and methods for manufacturing the same are disclosed. In an embodiment, a method of manufacturing a semiconductor device may include providing a substrate having a recess; epitaxially forming a first layer including a doped semiconductor material within the recess; and epitaxially forming a second layer including an undoped semiconductor material over at least a portion of the recess.