FABRICATION OF STRUCTURES OF METAL/SEMICONDUCTOR CFABRICATION OF STRUCTURES OF METAL/SEMICONDUCTOR COMPOUND BYX-RAY/EUV PROJECTION LITHOGRAPHY OMPOUND BYX-RAY/EUV PROJECTION LITHOGRAPHY

摘要

A lithography method for fabricating structures of etch-resistant metal- semiconductor compound on a substrate with sub-micrometer scale resolutions is describes. Superposed layers of metal and semiconductor capable of reacting with each other to form etch-resistant metal/semiconductor compound are deposited on the substrate. Radiation from a X-ray/EUR source propagates through a patterned X-ray transparent/EUR reflective mask and is projected o n the superposed metal and semiconductor layers. The X-ray transparent mask includes X-ray absorbing patterns imparted to the X-ray radiation while the EUV reflective mask includes EUV absorbing patterns also imparted to the EUV radiation. The energy of X-ray/EUV photons is absorbed locally by the metal and semiconductor layers. Absorption of this energy induces a reaction betwe en the two layers responsible for the formation of etch-resistant metal/semiconductor compound with structures corresponding to the patterns imparted to the radiation by the X-ray/EUV mask. The metal layer is subsequently etches using selective plasma or wet etching, leaving the structures of etch-resistant metal/semiconductor compound intact.