Charge Transfer Doping of Silicon

K. J. Rietwyk, Y. Smets, M. Bashouti, S. H. Christiansen, A. Schenk, A. Tadich, M. T. Edmonds, J. Ristein, L. Ley, and C. I. Pakes
Phys. Rev. Lett. 112, 155502 – Published 18 April 2014
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Abstract

We demonstrate a novel doping mechanism of silicon, namely n-type transfer doping by adsorbed organic cobaltocene (CoCp2*) molecules. The amount of transferred charge as a function of coverage is monitored by following the ensuing band bending via surface sensitive core-level photoelectron spectroscopy. The concomitant loss of electrons in the CoCp2* adlayer is quantified by the relative intensities of chemically shifted Co2p components in core-level photoelectron spectroscopy which correspond to charged and neutral molecules. Using a previously developed model for transfer doping, the evolution in relative intensities of the two components as a function of coverage has been reproduced successfully. A single, molecule-specific parameter, the negative donor energy of (0.50±0.15)eV suffices to describe the self-limiting doping process with a maximum areal density of transferred electrons of 2×1013cm2 in agreement with the measured downward band bending. The advantage of this doping mechanism over conventional doping for nanostructures is addressed.

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  • Received 4 December 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.155502

© 2014 American Physical Society

Authors & Affiliations

K. J. Rietwyk1,*, Y. Smets1, M. Bashouti2,3, S. H. Christiansen3, A. Schenk1, A. Tadich4, M. T. Edmonds5, J. Ristein6, L. Ley1,6, and C. I. Pakes1,†

  • 1Department of Physics, La Trobe University, Victoria 3086, Australia
  • 2Max-Planck-Institute for the Science of Light, D-91058 Erlangen, Germany
  • 3Institute of Nanoarchitectures for solar energy conversion, Helmholtz-Centre Berlin (HZB), D-14109 Berlin, Germany
  • 4Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia.
  • 5School of Physics, Monash University, Clayton, Victoria 3800, Australia
  • 6Technische Physik, Universität Erlangen, D-91058 Erlangen, Germany

  • *Corresponding author. k.rietwyk@latrobe.edu.au
  • c.pakes@latrobe.edu.au

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Issue

Vol. 112, Iss. 15 — 18 April 2014

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