3D Capacitor Electrode Surface for Higher Semiconductor Capacitance
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Solution Overview
Problem
The challenge in scaling down semiconductor devices is to maintain improved quality, yield, performance, and reliability while reducing complexity, particularly in achieving increased capacitance in capacitor structures.
Innovation Solution
The semiconductor device design features a substrate with a bottom conductive layer, bottom conductive protrusions, an insulator layer, bottom insulating protrusions, and a top conductive layer, which together form a capacitor structure. This configuration increases the contact surface between the insulator and the electrodes, enhancing capacitance through the use of bottom and top conductive and insulating protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional capacitor structures are used in scaled-down semiconductor devices, then device complexity is reduced, but capacitance is insufficient
Solution Approach 1:
The patent transitions from a conventional planar capacitor structure to a three-dimensional structure by adding conductive protrusions extending vertically from the bottom electrode and insulating protrusions extending from the top electrode. This dimensional change increases the effective contact surface area between electrodes and insulator, thereby increasing capacitance without proportionally increasing the device footprint or complexity
Solution Approach 2:
The capacitor structure is segmented into multiple functional regions: bottom conductive protrusions extending from the bottom electrode, insulating protrusions extending from the top electrode, and recess regions between them. This segmentation allows each component to contribute independently to the overall capacitance while maintaining a compact integrated structure
2Reliability
If the contact surface area is increased to enhance capacitance, then capacitance is improved, but manufacturing complexity increases
Solution Approach 1:
The conductive protrusions and insulating protrusions are formed as preliminary structures during the capacitor fabrication process, before final electrode deposition. The protrusions are created using selective etching and deposition techniques that prepare the surface geometry in advance, allowing subsequent layers to conform to the enhanced surface area without requiring additional complex assembly steps
Solution Approach 2:
The patent modifies geometric parameters of the capacitor structure by controlling the height, width, and spacing of conductive and insulating protrusions. These parameter changes optimize the contact surface area for maximum capacitance while remaining within the capabilities of standard semiconductor fabrication processes, thus balancing performance improvement with manufacturing feasibility
Data Source
AI summary
The present application discloses a semiconductor device and a method for fabricating the semiconductor device. The semiconductor device includes a substrate; a bottom conductive layer positioned on the substrate; at least one bottom conductive protrusion positioned on the bottom conductive layer; an insulator layer positioned on the bottom conductive layer and the at least one bottom conductive protrusion; at least one bottom insulating protrusion protruding from the insulator layer towards the bottom conductive layer and adjacent to the at least one bottom conductive protrusion; and a top conductive layer positioned on the insulator layer. The bottom conductive layer, the at least one bottom conductive protrusion, the insulator layer, the at least one bottom insulating protrusion, and the top conductive layer together configure a capacitor structure.