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Imaging of Metal/Semiconductor Interface by Ballistic-Electron-Emission Microscopy (Beem)

Published online by Cambridge University Press:  15 February 2011

E. Y. Lee ,
B. R. Turnew ,
J. R. Jimenez  and
L. J. Schowalter
E. Y. Lee
Affiliation:
Physics Department and Center for Integrated Electronics, Rensselaer Polytechnic Institute, Troy, NY 12180
B. R. Turnew
Affiliation:
Physics Department and Center for Integrated Electronics, Rensselaer Polytechnic Institute, Troy, NY 12180
J. R. Jimenez
Affiliation:
Electro-optics Technology Center, Tufts University, Medford, MA 02155
L. J. Schowalter
Affiliation:
Physics Department and Center for Integrated Electronics, Rensselaer Polytechnic Institute, Troy, NY 12180
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Abstract

Studies in ballistic-electron-emission spectroscopy (BEES) have enabled precise energy measurements of Schottky barrier heights with excellent spatial resolution and, more recently, it was shown that even scattering at the metal/semiconductor interface affects the BEES spectrum [1]. Monte Carlo simulations have been done to predict the spatial resolution of ballistic-electron-emission microscopy (BEEM) [2]. In this paper, we will discuss the experimental spatial resolution of BEEM, and we will also give some of our BEES results for Au/Si and for Au/PtSi/Si. Our experimental BEEM studies indicate that, for Au/Si, hot electron transport is diffusive rather than ballistic, because the inelastic mean free path length (∼100 nm) is much larger than the elastic mean free path length (∼10 nm). This is in agreement with existing theories and with the literature on the internal photoemission method of studying the transport. Even in this diffusive regime, the spatial resolution of BEEM is still expected to be very good, being on the order of 10 nm [2]. Our preliminary work on PtSi shows that it has an attenuation length of 4 nm, which differs significantly from that of Au.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 295: Symposium W – Atomic-Scale Imaging of Surfaces and Interfaces , 1992 , 231
Copyright
Copyright © Materials Research Society 1993

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References

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