Result: The optical properties of monolayer amorphous Al2O3-TiO2 composite films used as HT-APSM blanks for ArF immersion lithography
Department of Materials Engineering, Tatung University, Taipei 104, Tawain, Province of China
Institute of Nanotechnology, National Chiao Tung University, Hsinchu 300, Tawain, Province of China
CC BY 4.0
Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d’une licence CC BY 4.0 Inist-CNRS / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 licence by Inist-CNRS / A menos que se haya señalado antes, el contenido de este registro bibliográfico puede ser utilizado al amparo de una licencia CC BY 4.0 Inist-CNRS
Further Information
Amorphous (Al2O3)x(TiO2)1-x composite films are prepared using r.f. unbalanced magnetron sputtering in an atmosphere of argon and oxygen at room temperature. The optical constants of (Al2O3)x-(TiO2)1-x composite films are linearly dependent on the Al2O3 mole fraction in the Al2O3-TiO2composite film. The optical constants of these Al2O3-TiO2 composite films can be made to meet the optical requirements for a high transmittance attenuated phase shift mask (HT-APSM) blank by tuning the Al2O3 mole fraction. The Al2O3 mole fraction range that would allow the films to meet the optical requirements of an HT-APSM blank for ArF immersion lithography is calculated to be between 76% and 84%. One n-phase-shifted Al2O3-TiO2 composite thin film to be used as an HT-APSM blank for ArF immersion lithography is fabricated and is shown to satisfy the optical requirements.