Nitride Semiconductor Alignment Marks via Alkaline Surface Roughening
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Solution Overview
Problem
There is an increasing demand for improved alignment accuracy in nitride semiconductor devices as they decrease in size, which existing methods struggle to achieve.
Innovation Solution
A method involving the formation of an insulating film with openings, followed by the growth of a second nitride semiconductor layer and roughening its surface using an alkaline solution to create a detectable alignment mark, allowing for precise alignment of multiple device components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional alignment methods are used, then manufacturing process is simple, but alignment accuracy deteriorates as device size decreases
Solution Approach 1:
The invention changes the surface parameter of the alignment mark from smooth to rough by controlling the etching depth to 5 nm or more. This parameter change enhances light scattering properties, making the alignment mark clearly visible under optical microscopes, thereby improving alignment accuracy without requiring complex additional processes
Solution Approach 2:
The alignment mark utilizes the nitride semiconductor layer itself as the marking material, eliminating the need for separate marking materials or complex multi-step formation processes. The layer serves both as functional semiconductor material and as alignment reference, simplifying the overall manufacturing process while maintaining high alignment accuracy
2Manufacturing precision
If device size is reduced, then device integration increases, but alignment accuracy deteriorates
Solution Approach 1:
By controlling the surface roughness parameter (etching depth of 5 nm or more), the invention enhances the optical contrast of alignment marks. This allows clear detection even when device dimensions are reduced, maintaining alignment accuracy despite smaller device sizes and higher integration densities
3Measurement precision
If alignment mark visibility is improved, then alignment accuracy improves, but detection difficulty increases without proper surface treatment
Solution Approach 1:
The invention changes the surface roughness parameter of the alignment mark to enhance light scattering. This parameter modification makes the alignment mark clearly visible under optical microscopes without requiring specialized detection equipment, thereby improving both detection ease and measurement precision
Solution Approach 2:
The roughened surface of the alignment mark alters its optical appearance by scattering light, creating a visually distinct contrast against smooth surrounding areas. This optical contrast enhancement enables clear detection and precise measurement under standard optical microscopy conditions
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
Enhances alignment accuracy among various components in nitride semiconductor devices by facilitating the use of a visible alignment mark, thereby improving manufacturing precision.
Implementation Method 1
forming an alignment mark by roughening an upper surface of the second nitride semiconductor layer by a wet etching using an alkaline solution
Data Source
AI summary
A method for manufacturing a nitride semiconductor device includes forming an insulating film having a first opening on an upper surface of a first nitride semiconductor layer, the upper surface having a nitrogen polarity, forming a second nitride semiconductor layer on the upper surface inside the first opening, and forming an alignment mark by roughening an upper surface of the second nitride semiconductor layer by a wet etching using an alkaline solution.