A comparison between the behavior of nanorod array and planar Cd(Se, Te) photoelectrodes

Joshua M. Spurgeon, Harry A. Atwater, Nathan S Lewis

Research output: Contribution to journalArticle

108 Citations (Scopus)

Abstract

Analysis of the full device generation, transport, and recombination equations has shown that nanorod junction arrays can potentially offer improved photovoltaic performance relative to planar junctions for a carrier-collection limited absorber material not characterized by an excessively high rate of depletion-region recombination. To test this hypothesis, we have characterized planar and nanorod array photoelectrodes prepared by electrodeposition of Cd(Se, Te). The photoelectrochemical behavior of each type of photoelectrode was measured in contact with a liquid electrolyte consisting of aqueous 1 M S 2 2-/S2-, 1 M NaOH. The open-circuit photovoltage, VOC, short-circuit current density, JSC, fill factor, and overall energy conversion efficiency for both types of electrodes was measured under simulated 100 mW cm-2, Air Mass 1.5 conditions. VOC, JSC, and overall efficiencies were lower, on average, for nanorod array Cd(Se,Te) photoelectrodes, while the fill factors of the nanorod array photoelectrodes were generally superior to those of the planar junction devices. Importantly, the spectral response of the nanorod array photoelectrodes exhibited better quantum yields for collection of near-IR photons relative to collection of high-energy photons than did the planar photoelectrodes, in agreement with predictions of the theoretical model. The effects of surface recombination and junction area for both electrode designs have also been evaluated relative to planar photoelectrode junctions, using the Cd(Se,Te) electrode as a model system for the properties of nanorod array photoelectrodes.

Original languageEnglish
Pages (from-to)6186-6193
Number of pages8
JournalJournal of Physical Chemistry C
Volume112
Issue number15
DOIs
Publication statusPublished - Apr 17 2008

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Nanorods
nanorods
volatile organic compounds
Volatile organic compounds
Electrodes
electrodes
Photons
absorbers (materials)
energy conversion efficiency
air masses
photovoltages
photons
Quantum yield
short circuit currents
spectral sensitivity
Energy conversion
Electrodeposition
electrodeposition
Short circuit currents
Contacts (fluid mechanics)

ASJC Scopus subject areas

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

Cite this

A comparison between the behavior of nanorod array and planar Cd(Se, Te) photoelectrodes. / Spurgeon, Joshua M.; Atwater, Harry A.; Lewis, Nathan S.

In: Journal of Physical Chemistry C, Vol. 112, No. 15, 17.04.2008, p. 6186-6193.

Research output: Contribution to journalArticle

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