High-Density Capacitor Layout for BEOL-Safe Capacitance Scaling

The capacitor electrode is divided into multiple segments (first electrode segment, second electrode segment, third electrode segment) arranged in a stacked configuration. This segmentation allows the capacitor to achieve higher effective capacitance within a smaller footprint area, enabling increased integration density without requiring larger device dimensions that could interfere with previously fabricated FEOL and MEOL devices.

The capacitor structure transitions from a planar two-dimensional layout to a three-dimensional stacked configuration with vertical electrode segments separated by dielectric layers. This dimensional change enables the capacitor to utilize vertical space for capacitance generation, achieving higher integration density without increasing the lateral footprint that could damage existing devices during BEOL processing.

The capacitor employs a nested stacked structure where multiple electrode segments are vertically arranged with dielectric layers between them. Each electrode segment pair forms a capacitive element, and these elements are nested vertically to achieve cumulative capacitance. This nesting approach allows the capacitor to maintain high capacitance values while occupying a reduced lateral footprint, thereby increasing integration density without sacrificing capacitance per device.

The capacitor utilizes composite material structures including conductive electrode materials (such as tungsten or copper), dielectric materials (such as silicon oxide or silicon nitride), and barrier materials. This composite construction enables the formation of multiple thin-film layers in a stacked configuration, increasing the effective capacitance area within a compact volume and allowing high integration density while maintaining adequate capacitance values.

The manufacturing process utilizes low temperature deposition techniques (such as atomic layer deposition or chemical vapor deposition at reduced temperatures) to form the dielectric layers and electrode structures. By changing the processing temperature parameter to remain below the damage threshold for previously fabricated FEOL and MEOL devices, the process achieves compatibility while still enabling the formation of high-quality thin-film capacitor structures with appropriate dielectric constants and conductive properties.

The capacitor structure employs composite materials specifically selected for their ability to be deposited and processed at low temperatures. This includes using dielectric materials with appropriate transition temperatures and conductive materials that can be deposited via low-temperature techniques. The composite material selection enables the manufacturing process to operate at reduced temperatures, preventing damage to existing devices while maintaining adequate process capability for forming functional capacitor structures.