Photoelectrochemical behavior of n-type Si(100) electrodes coated with thin films of manganese oxide grown by atomic layer deposition

Nicholas C. Strandwitz, David J. Comstock, Ronald L. Grimm, Adam C. Nichols-Nielander, Jeffrey Elam, Nathan S Lewis

Research output: Contribution to journalArticle

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Abstract

Thin (10 nm) films of manganese oxide have been deposited by atomic layer deposition (ALD) onto n-type silicon and onto degenerately doped p-type silicon. The photoelectrochemical properties of the resulting semiconductor/metal-oxide structures were evaluated in contact with aqueous 0.35 M K4Fe(CN) 6-0.05 M K3Fe(CN)6, 1.0 M KOH(aq), as well as in contact with a series of nonaqueous one-electron, reversible, outer-sphere redox systems. Under simulated air mass (AM) 1.5 illumination in contact with 0.35 M K4Fe(CN)6-0.05 M K3Fe(CN) 6(aq), MnO-coated n-Si photoanodes displayed open-circuit voltages of up to 550 mV and stable anodic currents for periods of hours at 0.0 V versus the solution potential. In contact with 1.0 M KOH(aq), at current densities of ∼25 mA cm-2, MnO|Si photoanodes under 100 mW cm-2 of simulated AM 1.5 illumination yielded stable oxygen evolution for 10-30 min. Variation in the thickness of the MnO films from 4 to 20 nm indicated the presence of a series resistance in the MnO film that limited the fill factor and thus the solar energy-conversion efficiency of the photoelectrodes. Open-circuit photovoltages of 30 and 450 mV, respectively, were observed in contact with cobaltocene+/0 or ferrocene+/0 in CH 3CN, indicating that the energetics of the MnO-coated Si surfaces were a function of the electrochemical potential of the contacting electrolyte solution.

Original languageEnglish
Pages (from-to)4931-4936
Number of pages6
JournalJournal of Physical Chemistry C
Volume117
Issue number10
DOIs
Publication statusPublished - Mar 14 2013

Fingerprint

Manganese oxide
Atomic layer deposition
manganese oxides
atomic layer epitaxy
air masses
Silicon
Thin films
Contacts (fluid mechanics)
Electrodes
electrodes
thin films
Lighting
illumination
solar energy conversion
energy conversion efficiency
photovoltages
silicon
Open circuit voltage
Air
open circuit voltage

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Photoelectrochemical behavior of n-type Si(100) electrodes coated with thin films of manganese oxide grown by atomic layer deposition. / Strandwitz, Nicholas C.; Comstock, David J.; Grimm, Ronald L.; Nichols-Nielander, Adam C.; Elam, Jeffrey; Lewis, Nathan S.

In: Journal of Physical Chemistry C, Vol. 117, No. 10, 14.03.2013, p. 4931-4936.

Research output: Contribution to journalArticle

Strandwitz, Nicholas C. ; Comstock, David J. ; Grimm, Ronald L. ; Nichols-Nielander, Adam C. ; Elam, Jeffrey ; Lewis, Nathan S. / Photoelectrochemical behavior of n-type Si(100) electrodes coated with thin films of manganese oxide grown by atomic layer deposition. In: Journal of Physical Chemistry C. 2013 ; Vol. 117, No. 10. pp. 4931-4936.
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