Profiling Photoinduced Carrier Generation in Semiconductor Microwire Arrays via Photoelectrochemical Metal Deposition

Mita Dasog, Azhar I. Carim, Sisir Yalamanchili, Harry A. Atwater, Nathan S Lewis

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Au was photoelectrochemically deposited onto cylindrical or tapered p-Si microwires on Si substrates to profile the photoinduced charge-carrier generation in individual wires in a photoactive semiconductor wire array. Similar experiments were repeated for otherwise identical Si microwires doped to be n-type. The metal plating profile was conformal for n-type wires, but for p-type wires was a function of distance from the substrate and was dependent on the illumination wavelength. Spatially resolved charge-carrier generation profiles were computed using full-wave electromagnetic simulations, and the localization of the deposition at the p-type wire surfaces observed experimentally correlated well with the regions of enhanced calculated carrier generation in the volumes of the microwires. This technique could potentially be extended to determine the spatially resolved carrier generation profiles in a variety of mesostructured, photoactive semiconductors.

Original languageEnglish
Pages (from-to)5015-5021
Number of pages7
JournalNano Letters
Volume16
Issue number8
DOIs
Publication statusPublished - Aug 10 2016

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Metals
wire
Wire
Semiconductor materials
metals
profiles
Charge carriers
charge carriers
Substrates
plating
Plating
Electromagnetic waves
electromagnetic radiation
Lighting
illumination
Wavelength
wavelengths
simulation
Experiments

Keywords

  • carrier generation
  • electrodeposition
  • microwires
  • photoelectrochemistry
  • Semiconductor
  • silicon

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Profiling Photoinduced Carrier Generation in Semiconductor Microwire Arrays via Photoelectrochemical Metal Deposition. / Dasog, Mita; Carim, Azhar I.; Yalamanchili, Sisir; Atwater, Harry A.; Lewis, Nathan S.

In: Nano Letters, Vol. 16, No. 8, 10.08.2016, p. 5015-5021.

Research output: Contribution to journalArticle

Dasog, Mita ; Carim, Azhar I. ; Yalamanchili, Sisir ; Atwater, Harry A. ; Lewis, Nathan S. / Profiling Photoinduced Carrier Generation in Semiconductor Microwire Arrays via Photoelectrochemical Metal Deposition. In: Nano Letters. 2016 ; Vol. 16, No. 8. pp. 5015-5021.
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