Capacitor Electrode Supporting Layers With Single-Mask Aligned Openings
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Solution Overview
Problem
The scaling down of semiconductor devices poses challenges in achieving improved quality, yield, performance, and reliability while reducing complexity, particularly in the design and fabrication processes.
Innovation Solution
A semiconductor device design featuring a plurality of drain regions, capacitor plugs, lower electrodes with a U-shaped cross-sectional profile, and supporting layers with aligned openings, allowing for the use of the same photomask to form openings, thereby reducing fabrication costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple photomasks are used to form first and second openings in supporting layers, then alignment precision and manufacturing control are improved, but fabrication cost and process complexity increase
Solution Approach 1:
The patent merges the formation of first openings in the lower supporting layer and second openings in the higher supporting layer into a single photomask patterning step. By designing the photomask to define both opening patterns simultaneously, the invention eliminates the need for separate photomasks and alignment steps, thereby reducing fabrication cost and process complexity while maintaining adequate alignment precision through the single-step patterning approach
2Manufacturing precision
If multiple photomasks are used to form first and second openings in supporting layers, then alignment precision is improved, but fabrication cost increases
Solution Approach 1:
The invention combines the patterning functions of multiple photomasks into a single photomask that defines both the first openings in the lower supporting layer and the second openings in the higher supporting layer. This merging eliminates the need for purchasing, storing, and aligning multiple photomasks, directly reducing fabrication costs while achieving the required alignment precision through the integrated single-step patterning process
3Adaptability or versatility
If supporting layers are designed without aligned openings of equal width, then fabrication flexibility is improved, but alignment precision and structural integrity deteriorate
Solution Approach 1:
The patent applies local quality by designing the supporting layers with specific regions (aligned openings of equal width) that require high precision, while other regions of the device can maintain fabrication flexibility. The aligned openings are strategically positioned to provide structural support and electrical isolation where precision is critical, without constraining the overall device design and fabrication process
Data Source
AI summary
A semiconductor device and a method for fabricating the semiconductor device. The semiconductor device includes a plurality of drain regions in a substrate; a plurality of capacitor plugs on the plurality of drain regions; a plurality of lower electrodes on the plurality of capacitor plugs and respectively including a U-shaped cross-sectional profile; a lower supporting layer above the substrate, against on outer surfaces of the plurality of lower electrodes, and including: a plurality of first openings along the lower supporting layer and between the plurality of lower electrodes; and a higher supporting layer above the lower supporting layer, against on the outer surfaces of the plurality of lower electrodes, and including a plurality of second openings along the higher supporting layer and topographically aligned with the plurality of first openings. The widths of the first openings and the widths of the second openings are substantially the same.