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Behavior of Electrodeposited Cd and Pb Schottky Junctions on CH3-Terminated n-Si(111) Surfaces

Maldonado, Stephen and Lewis, Nathan S. (2009) Behavior of Electrodeposited Cd and Pb Schottky Junctions on CH3-Terminated n-Si(111) Surfaces. Journal of the Electrochemical Society, 156 (2). H123-H128. ISSN 0013-4651. http://resolver.caltech.edu/CaltechAUTHORS:MALjes09

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Abstract

n-Si/Cd and n-Si/Pb Schottky junctions have been prepared by electrodeposition of Cd or Pb from acidic aqueous solutions onto H-terminated and CH3-terminated n-type Si(111) surfaces. For both nondegenerately (n-) and degenerately (n+-) doped H–Si(111) electrodes, Cd and Pb were readily electroplated and oxidatively stripped, consistent with a small barrier height (Phib) at the Si/solution and the Si/metal junctions. Electrodeposition of Cd or Pb onto degenerately doped CH3-terminated n+-Si(111) electrodes occurred at the same potentials as Cd or Pd electrodeposition onto H-terminated n+-Si(111). However, electrodeposition on nondegenerately doped CH3-terminated n-Si(111) surfaces was significantly shifted to more negative applied potentials (by −130 and −347 mV, respectively), and the anodic stripping of the electrodeposited metals was severely attenuated, indicating large values of Phib for contacts on nondegenerately doped n-type CH3–Si(111) surfaces. With either Cd or Pb, current–voltage measurements on the dry, electrodeposited Schottky junctions indicated that much larger values of Phib were obtained on CH3-terminated n-Si(111) surfaces than on H-terminated n-Si(111) surfaces. Chronoamperometric data indicated that CH3–Si(111) surfaces possessed an order-of-magnitude lower density of nucleation sites for metal electrodeposition than did H–Si(111) surfaces, attesting to the high degree of structural passivation afforded by the CH3–Si surface modification.


Item Type:Article
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http://dx.doi.org/10.1149/1.3021450DOIUNSPECIFIED
Additional Information:© 2008 The Electrochemical Society. Manuscript submitted June 2, 2008; revised manuscript received October 13, 2008. Published December 9, 2008. We thank the National Science Foundation (Grant CHE-0604894) for financial support and the Gordon and Betty Moore Foundation for postdoctoral fellowship support (S.M.). California Institute of Technology assisted in meeting the publication costs of this article.
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Funding AgencyGrant Number
National Science FoundationCHE-0604894
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:cadmium; electrodeposition; lead; passivation; Schottky barriers; surface treatment; X-ray photoelectron spectra
Record Number:CaltechAUTHORS:MALjes09
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:MALjes09
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12494
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:11 Dec 2008 06:38
Last Modified:26 Dec 2012 10:33

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