Lithography Resolution via Independent Ion Implantation

The patent replaces the optical lithography system with a direct-write ion implantation system. Instead of using light to define patterns, the invention uses ion beams to directly modify the semiconductor substrate, creating patterns with dimensions below the optical diffraction limit. This substitution of the physical mechanism enables resolution beyond 0.25 nm by eliminating the optical wavelength constraint entirely.

The patent changes the fundamental parameter from optical wavelength to ion beam energy and dosage. By controlling ion implantation parameters (energy, current, dosage, and scanning patterns) rather than optical parameters (wavelength, numerical aperture, exposure dose), the system achieves sub-0.25 nm resolution. The critical dimension is controlled by ion beam parameters rather than optical diffraction limits.

The patent segments the patterning process into multiple independent ion implantation steps, each creating a specific doped area. The photoresist pattern is divided into multiple regions that receive different ion implants at different angles and dosages. This segmentation allows precise control over each feature's dimensions and properties, achieving high resolution by treating each pattern element independently rather than attempting to create all features in a single exposure step.

The patent employs periodic ion implantation cycles with alternating implantation directions and parameters. Multiple ion implantation processes are performed in sequence, with each cycle creating or refining specific pattern features. The periodic repetition of implantation steps at different orientations enables the formation of complex high-resolution patterns that cannot be achieved in a single step, while maintaining process control through systematic repetition.