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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. doi:10.1149/1.3021450.

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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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URLURL TypeDescription
Maldonado, Stephen0000-0002-2917-4851
Lewis, Nathan S.0000-0001-5245-0538
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.
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
Issue or Number:2
Record Number:CaltechAUTHORS:MALjes09
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12494
Deposited By: Archive Administrator
Deposited On:11 Dec 2008 06:38
Last Modified:08 Nov 2021 22:29

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