According to ZDNET, SK hynix is pushing forward with its extreme ultraviolet (EUV) lithography technology to enable mass production of next-generation DRAM. The company introduced its first high-numerical-aperture (High-NA) EUV equipment last year and fully commenced R&D on the related technology this year. It is reported that the company has now fully begun introducing PSM (phase-shift mask) to enhance EUV lithography performance.