Progress on the Realization of the Electron Column Modules for SCALPEL High-Throughput/Alpha Electron Projection Lithography Tools

With the production of the first High-Throughput Alpha Tools, Electron Beam Projection Lithography (EPL) is entering the commercialization phase. Here, we report on the realization of the electron column modules for the SCALPEL HT/Alpha EPL systems, designed to demonstrate high wafer throughput at resolutions at and below 100 nm. We describe our highly modular setup of each electron optical component targeted at maximum flexibility and enabling a fast and smooth evolution towards higher throughput and resolution. By applying strict design and process rules, we were able to set up the complete production flow from the design, construction and manufacturing of the components of the ferrite/dielectric deflector based projection optics up to established qualification schemes within less than one year. A crucial point for the overall tool performance is the timely availability of system alignment metrology strategies. Here we adapt state-of-the art techniques from light optical lens manufacturing to a maximum amount. We discuss our metrology and alignment approach based on aerial image analysis combined with extensive electron optical imaging simulations and present first theoretical and experimental sub-100 nm results.