Quantifying Desorption of Saturated Hydrocarbons from Silicon with Quantum Calculations and Scanning Tunneling Microscopy

N. L. Yoder, N. P. Guisinger, M. C. Hersam, R. Jorn, C.-C. Kaun, and T. Seideman
Phys. Rev. Lett. 97, 187601 – Published 3 November 2006

Abstract

Electron stimulated desorption of cyclopentene from the Si(100)(2×1) surface is studied experimentally with cryogenic UHV STM and theoretically with transport, electronic structure, and dynamical calculations. Unexpectedly for a saturated hydrocarbon on silicon, desorption is observed at bias magnitudes as low as 2.5 V, albeit the desorption yields are a factor of 500 to 1000 lower than previously reported for unsaturated molecules on silicon. The low threshold voltage for desorption is attributed to hybridization of the molecule with the silicon surface, which results in low-lying ionic resonances within 2–3 eV of the Fermi level. These resonances are long-lived, spatially localized, and displaced in equilibrium with respect to the neutral state. This study highlights the importance of nuclear dynamics in silicon-based molecular electronics and suggests new guidelines for the control of such dynamics.

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  • Received 20 July 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.187601

©2006 American Physical Society

Authors & Affiliations

N. L. Yoder, N. P. Guisinger, and M. C. Hersam*

  • Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208-3108, USA

R. Jorn, C.-C. Kaun, and T. Seideman

  • Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA

  • *Electronic address: m-hersam@northwestern.edu
  • Electronic address: t-seideman@northwestern.edu

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Issue

Vol. 97, Iss. 18 — 3 November 2006

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