Comparison between the electrical junction properties of H-terminated and methyl-terminated individual Si microwire/polymer assemblies for photoelectrochemical fuel production

Iman Yahyaie, Shane Ardo, Derek R. Oliver, Douglas J. Thomson, Michael S. Freund, Nathan S Lewis

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The photoelectrical properties and stability of individual p-silicon (Si) microwire/polyethylenedioxythiophene/polystyrene sulfonate:Nafion/n-Si microwire structures, designed for use as arrays for solar fuel production, were investigated for both H-terminated and CH3-terminated Si microwires. Using a tungsten probe method, the resistances of individual wires, as well as between individual wires and the conducting polymer, were measured vs. time. For the H-terminated samples, the n-Si/polymer contacts were initially rectifying, whereas p-Si microwire/polymer contacts were initially ohmic, but the resistance of both the n-Si and p-Si microwire/polymer contacts increased over time. In contrast, relatively stable, ohmic behavior was observed at the junctions between CH3-terminated p-Si microwires and conducting polymers. CH3-terminated n-Si microwire/polymer junctions demonstrated strongly rectifying behavior, attributable to the work function mismatch between the Si and polymer. Hence, a balance must be found between the improved stability of the junction electrical properties achieved by passivation, and the detrimental impact on the effective resistance associated with the additional rectification at CH3-terminated n-Si microwire/polymer junctions. Nevertheless, the current system under study would produce a resistance drop of ∼20 mV during operation under 100 mW cm-2 of Air Mass 1.5 illumination with high quantum yields for photocurrent production in a water-splitting device.

Original languageEnglish
Pages (from-to)9789-9794
Number of pages6
JournalEnergy and Environmental Science
Volume5
Issue number12
DOIs
Publication statusPublished - Dec 2012

Fingerprint

Polymers
polymer
Conducting polymers
Wire
Tungsten
Quantum yield
Silicon
Photocurrents
Passivation
electrical property
comparison
Polystyrenes
Electric properties
sulfonate
tungsten
Lighting
air mass
silicon
Water
probe

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Chemistry
  • Pollution
  • Nuclear Energy and Engineering

Cite this

Comparison between the electrical junction properties of H-terminated and methyl-terminated individual Si microwire/polymer assemblies for photoelectrochemical fuel production. / Yahyaie, Iman; Ardo, Shane; Oliver, Derek R.; Thomson, Douglas J.; Freund, Michael S.; Lewis, Nathan S.

In: Energy and Environmental Science, Vol. 5, No. 12, 12.2012, p. 9789-9794.

Research output: Contribution to journalArticle

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