Optical and electrical properties of synthesized reactive rf sputter deposited boron-rich and boron-doped diamond-like carbon thin films


Boron-doped diamond-like carbon (B-DLC) and boron-rich DLC thin films have been deposited on n-type silicon and quartz substrates by reactive rf magnetron sputtering process. Boron carbide (B4C) target was used in the deposition. Reducing the boron/carbon ratio was achieved by either using hydrogen gas or by introducing a proper flow rate of methane. Another approach of producing B-DLC thin films was achieved by using low methane\argon ratio (5/40) while sputtering atoms from non-saturated target-surface under various sputtering rf powers. The maximum film graphitization and lowest band gap energy was achieved by applying 100 W power. The Auger electron spectroscopy and Raman shifts were used to investigate the composition of the films. The optical properties were investigated using spectroscopic ellipsometry and spectrophotometer. Furthermore, p-type B-DLC/n-type Si(100) heterojunction diode was fabricated and the IV characteristics were investigated against the flow rates of methane or the rf power.

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The author would like to thank Jordan University of Science and Technology in Jordan for the valuable support. Also great acknowledgment is extended to Prof. N.J. Ianno and J.A. Woollam at the Center for Microelectronics & Optical Materials Research (CMOMR), the University of Nebraska-Lincoln, NE, USA for the technical support and the personal advices.

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Ahmad, A.A. Optical and electrical properties of synthesized reactive rf sputter deposited boron-rich and boron-doped diamond-like carbon thin films. J Mater Sci: Mater Electron 28, 1695–1705 (2017). https://doi.org/10.1007/s10854-016-5715-7

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  • Boron Carbide
  • Flow Rate Ratio
  • Argon Flow Rate
  • Methane Flow Rate
  • Variable Angle Spectroscopic Ellipsometry