Integrated Wafer Test Structure for Dopant and Lattice Evaluation
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Solution Overview
Problem
Conventional semiconductor structures require separate test structures for evaluating dopant variations and lattice direction differences, necessitating distinct testing operations, which can be inefficient.
Innovation Solution
A semiconductor structure with a test structure comprising multiple devices, including source/drain layers and gate layers disposed in specific orientations, allowing for simultaneous testing of lattice direction differences and dopant variations within the same operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate test structures are used for evaluating dopant variations and lattice direction differences, then each testing purpose can be evaluated independently, but the testing process requires multiple distinct operations which reduces efficiency
Solution Approach 1:
The patent combines multiple test structures (first test structure for dopant variations, second test structure for lattice direction differences) into a single integrated test structure. This merging allows both types of testing to be performed simultaneously in one operation, resolving the contradiction by maintaining measurement precision for both test types while improving productivity through consolidated testing procedures.
Solution Approach 2:
The integrated test structure is designed to serve multiple functions: it can evaluate both dopant variations and lattice direction differences within the same structure. This multi-functionality enables a single test structure to replace multiple separate test structures, allowing comprehensive testing in one operation and thereby improving testing efficiency without sacrificing the precision needed for evaluating different parameters.
2Adaptability or versatility
If multiple separate test structures are formed on wafers, then comprehensive testing coverage is achieved, but the complexity of testing procedures increases
Solution Approach 1:
The patent merges multiple separate test structures into a single integrated test structure that contains all necessary components for evaluating both dopant variations and lattice direction differences. This consolidation reduces the number of separate testing procedures needed while maintaining comprehensive testing coverage, thereby reducing procedure complexity without sacrificing versatility.
Solution Approach 2:
Within the integrated test structure, different regions are segmented to serve specific testing purposes: a first region for evaluating dopant variations and a second region for evaluating lattice direction differences. This segmentation allows comprehensive testing coverage to be achieved within a single unified structure, simplifying the overall testing procedure while maintaining the ability to independently evaluate different parameters.
3Reliability
If separate testing operations are conducted for different test purposes, then each test can be optimized for its specific function, but the overall process time and operational complexity increase
Solution Approach 1:
The patent combines multiple testing operations into a single integrated testing process. The integrated test structure allows dopant variation evaluation and lattice direction difference evaluation to be performed simultaneously, reducing the total time required while maintaining the reliability of each specific test function through dedicated regions within the unified structure.
Data Source
AI summary
The present disclosure provides a semiconductor structure having a test structure. The semiconductor structure includes a wafer and a test structure disposed on the wafer. The test structure includes a first device having a first source/drain layer and a first gate layer disposed above the first source/drain layer; a second device, having a second source/drain layer and a second gate layer disposed above the second source/drain layer, the second gate layer connected to the first gate layer; a third device, disposed adjacent to the first device and having a third source/drain layer. The first gate layer is disposed above the third source/drain layer, and the first gate layer is disposed along a first direction and the second gate layer is disposed along a second direction orthogonal to the first direction.