Integrated Resistive Elements Near Gates to Cut Area and Delay
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Solution Overview
Problem
Existing semiconductor manufacturing processes face challenges in fabricating reliable electronic devices due to increased complexity and inefficiencies, particularly in the formation of resistive elements, which consume valuable chip area and increase signal delay when integrated in the BEOL process.
Innovation Solution
Forming resistive elements as part of the MEOL and/or FEOL process, reducing chip area consumption and signal delay by integrating them closer to FEOL devices, thereby enhancing device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If resistive elements are formed as part of the BEOL process, then the manufacturing process is simplified, but chip area consumption increases and signal delay increases
Solution Approach 1:
The patent transitions resistive element formation from the back-end-of-line (BEOL) process to the front-end-of-line (FEOL) process, representing a fundamental dimensional change in the manufacturing timeline. This allows resistive elements to be formed concurrently with transistor structures in the same process module, eliminating the need for separate BEOL integration steps and reducing overall chip area while maintaining manufacturing simplicity
Solution Approach 2:
The patent applies preliminary action by forming resistive elements during the FEOL process stage, before the BEOL interconnect layers are formed. This preliminary formation of resistive elements allows them to be integrated into the chip structure early in the manufacturing sequence, reducing the subsequent need for additional processing steps and minimizing chip area consumption
2Ease of manufacture
If resistive elements are formed as part of the BEOL process, then the manufacturing process is simplified, but signal delay increases
Solution Approach 1:
The patent transitions resistive element formation from the back-end-of-line (BEOL) process to the front-end-of-line (FEOL) process, representing a fundamental dimensional change in the manufacturing timeline. This allows resistive elements to be formed concurrently with transistor structures in the same process module, eliminating the need for separate BEOL integration steps and reducing overall chip area while maintaining manufacturing simplicity
Solution Approach 2:
The patent applies preliminary action by forming resistive elements during the FEOL process stage, before the BEOL interconnect layers are formed. This preliminary formation of resistive elements allows them to be integrated into the chip structure early in the manufacturing sequence, reducing the subsequent need for additional processing steps and minimizing chip area consumption
3Productivity
If chip scaling is continued to improve production efficiency and lower costs, then production efficiency improves and costs decrease, but manufacturing complexity increases
Solution Approach 1:
The patent merges the formation of resistive elements with the existing FEOL process module that forms transistor structures. By combining these two previously separate manufacturing operations into a single integrated process flow, the patent achieves economies of scale without adding proportional complexity, as both structures are formed using similar process steps in the same manufacturing module
Data Source
AI summary
A semiconductor structure having a resistive element includes a substrate having an active region, a first gate structure formed over the active region, and a first resistive element formed over the active region and adjacent to the first gate structure. In some embodiments, the first resistive element includes a first resistive layer and a second resistive layer formed over the first resistive layer. In some examples, a total resistance of the first resistive element is a combination of resistances of the first and second resistive layers.