3D-Stacked NFET/PFET Structures for Density and Width Balancing

The semiconductor device is divided into multiple transistor structures (first transistor structure, second transistor structure, third transistor structure) with different configurations. Each structure contains FETs with specific polarity and channel width combinations, allowing independent optimization of each segment while achieving high overall density. The segmentation enables different manufacturing processes to be applied to different segments based on their specific requirements.

Different regions of the semiconductor device have locally optimized characteristics. The first transistor structure has NFETs with greater channel width than PFETs, while the second transistor structure has PFETs with greater channel width than NFETs. The third transistor structure includes FETs with yet another width relationship. This local quality approach allows each region to be tailored for its specific functional requirements while maintaining manufacturability.

Each transistor structure implements locally optimized channel width ratios tailored to its specific FET polarity combinations and functional requirements. The first transistor structure optimizes for NFET-dominant performance with wider NFET channels, the second optimizes for PFET-dominant performance with wider PFET channels, and the third provides additional optimization variants. This local quality approach enables current speed and power efficiency optimization without requiring uniform high-precision manufacturing across all structures.

The invention employs different channel width parameters (W1, W2, W3, W4, W5, W6) with specific relationships (W1>W2, W3>W4, W5>W6) to optimize electrical performance. By varying these dimensional parameters across different transistor structures, the device achieves improved current speed and power efficiency while the parameter relationships provide manufacturing tolerance guidance.

The invention transitions from planar 2D FET arrangements to 3D-stacked configurations where transistor structures are vertically stacked in multiple levels. The first transistor structure, second transistor structure, and third transistor structure are arranged in three-dimensional space with vertical stacking, dramatically improving area efficiency. The dimensional transition to 3D architecture enables higher device density while the structured design maintains structural integrity.

The 3D-stacked device is segmented into multiple discrete transistor structures (first, second, and third structures) that can be independently designed and manufactured. Each structure contains specific FET combinations with optimized configurations. This segmentation allows the complex 3D structure to be broken down into manageable units that can be assembled with controlled interconnections, improving both manufacturability and structural stability.