FinFET Drift-Layer Structure for Higher Current Density

The drift layer is segmented into multiple regions with different dopant concentrations (first drift region with first concentration, second drift region with second concentration). This segmentation allows optimization of current flow in different zones, achieving high current density in smaller die size while managing the complexity through systematic division of the structure.

Different regions of the FinFET device are assigned different dopant concentrations tailored to their specific functional requirements. The source/drain regions have higher dopant concentrations for carrier injection, while the drift regions have graded concentrations for optimal electric field distribution. This local quality approach maximizes current density without uniformly increasing complexity throughout the entire device.

The patent employs graded dopant concentration profiles where the dopant concentration varies continuously or in steps across different regions. Instead of abrupt changes between high and low concentrations, the graded transition reduces manufacturing precision requirements by allowing more tolerant doping processes while still achieving the desired current flow enhancement through optimized parameter distribution.

The patent applies dopant concentrations that are optimized for each specific region rather than uniformly high concentrations throughout. The source and drain regions receive higher dopant concentrations where needed for carrier injection, while the drift regions use moderate graded concentrations. This partial action approach achieves sufficient current flow enhancement without the excessive manufacturing precision requirements that would result from uniformly high dopant concentrations.