High Temperature Surface Conductivity of Hydrogenated Diamond Films Exposed to Humid Air

• Authors: K. Stec , P. Szroeder , K. Benzhour
• Languages of publication: EN

Abstracts

EN

Surface conductivity of thin diamond films was measured as a function of temperature up to 450°C. Hydrogenated diamond was synthesized by chemical vapor deposition in hydrogen/carbon plasma. Low values of charge carrier activation energy ( ≈ 10 meV) were observed, when hydrogenated diamond films were exposed to the ambient humid air. However, the activation energy increased by two orders of magnitude as film temperature exceeded 300°C. We have attributed this behavior to the desorption of the H_2O adlayer. The jump of the activation energy did not occur, when experiment was performed in vacuum. We have also shown that donor doping leads to the up-shift of the Fermi level much above the acceptor-like band gap levels induced by surface C-H bonds, which cannot be compensated by transfer of electrons from diamond to the double H-H_2O layer.

Keywords

EN

73.25.+i; 81.05.ug

Discipline

• 81.05.ug: Diamond
• 73.25.+i: Surface conductivity and carrier phenomena

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 3
• Pages: 511-514

Dates

published

2010-09

Contributors

author

K. Stec

• Institute of Physics, Nicolaus Copernicus University, Grudziądzka 5/7, 87-100 Toruń, Poland

author

P. Szroeder

• Institute of Physics, Nicolaus Copernicus University, Grudziądzka 5/7, 87-100 Toruń, Poland

author

K. Benzhour

• Department of Bases of Theoretical Biomedical Studies and Medical Computer Science, Collegium Medicum, Nicolaus Copernicus University, Jagiellońska 13, 85-067 Bydgoszcz, Poland

References

• 1. K. Larsson, J. Ristein, J. Phys. Chem. B 109, 10304 (2005)
• 2. C.E. Nebel, H. Kato, B. Rezek, D. Shin, D. Takeuchi, H. Watanabe, T. Yamamoto, Diamond Relat. Mater. 15, 264 (2006)
• 3. J. Ristein, M. Riedel, F. Maier, B.F. Mantel, M. Stammler, L. Ley, J. Phys., Condens. Matter 13, 8979 (2001)
• 4. F. Maier, M. Riedel, B.F. Mantel, J. Ristein, L. Ley, Phys. Rev. Lett. 85, 3472 (2000)
• 5. J. Ristein, Surf. Sci. 600, 3677 (2006)
• 6. L. Ley, J. Ristein, F. Maier, M. Riedel, P. Strobel, Physica B 262, 376 (2006)
• 7. J. Ristein, J. Phys. D, Appl. Phys. 39, R71 (2006)
• 8. J. Ristein, P. Strobel, L. Ley, Adv. Sci. Technol. 48, 93 (2006)
• 9. V. Chakrapani, J.C. Angus, A.B. Anderson, S.D. Wolter, B.S. Stoner, G.U. Sumanasekara, Science 318, 1424 (2007)
• 10. A.N. Andriotis, G. Mpourmpakis, E. Richter, M. Menon, Phys. Rev. Lett. 100, 106801 (2008)

Identifiers

DOI

10.12693/APhysPolA.118.511