X Ray Mask Of Gold-Carbon Mixture Absorber On BCN Compound Substrate Fabricated By Plasma Processes

Chandrasekhar R. Aiyer; Satoshi Itoh; Hitomi Yamada; Shinzo Morita; Shuzo Hattori

doi:10.1117/12.945628

14 June 1988 X Ray Mask Of Gold-Carbon Mixture Absorber On BCN Compound Substrate Fabricated By Plasma Processes

Chandrasekhar R. Aiyer, Satoshi Itoh, Hitomi Yamada, Shinzo Morita, Shuzo Hattori

Proceedings Volume 0923, Electron-Beam, X-Ray, and Ion Beam Technology: Submicrometer Lithographies VII; (1988) https://doi.org/10.1117/12.945628
Event: Medical Imaging II, 1988, Newport Beach, CA, United States

Abstract

X-ray mask fabrication based on BCN compound membrane and gold containing polymeric carbon ( Au-C ) absorber by totally dry processes is proposed. The Au-C films were depo-sited by plasma polymerization of propylene or styrene monomers and co-evaporation of gold. These films have 2 to 5 times higher etching rate than that of pure gold for 09 RIE, depending on the Au content. The stress in the films could be reduced to 1.9 E 7 N/m2 by annealing. The BCN films were deposited on silicon wafers by rf (13.56 MHz) plasma CVD with diborane, methane and nitrogen as source gases at typical deposition rate of 30 nm/min. The optical (633nm) and X ray (Pd L∝) transparencies were nearly 80% for film thickness of 6 um. Patterning of Au-C was achieved by using tungsten as intermediate layer and PMMA electron beam resist. CF4 RIE was used to etch the tungsten layer which in turn acted as mask for the gold carbide 02 RIE. The process parameters and the characteristics of the Au-C and BCN films are presented.

Citation Download Citation

Chandrasekhar R. Aiyer, Satoshi Itoh, Hitomi Yamada, Shinzo Morita, and Shuzo Hattori "X Ray Mask Of Gold-Carbon Mixture Absorber On BCN Compound Substrate Fabricated By Plasma Processes", Proc. SPIE 0923, Electron-Beam, X-Ray, and Ion Beam Technology: Submicrometer Lithographies VII, (14 June 1988); https://doi.org/10.1117/12.945628

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