Polarization control of morphological pattern orientation during light-mediated synthesis of nanostructured se-Te films

Azhar I. Carim, Nicolas A. Batara, Anjali Premkumar, Harry A. Atwater, Nathan S Lewis

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The template-free growth of well ordered, highly anisotropic lamellar structures has been demonstrated during the photoelectrodeposition of Se-Te films, wherein the orientation of the pattern can be directed by orienting the linear polarization of the incident light. This control mechanism was investigated further herein by examining the morphologies of films grown photoelectrochemically using light from two simultaneous sources that had mutually different linear polarizations. Photoelectrochemical growth with light from two nonorthogonally polarized samewavelength sources generated lamellar morphologies in which the long axes of the lamellae were oriented parallel to the intensity-weighted average polarization orientation. Simulations of light scattering at the solution-film interface were consistent with this observation. Computer modeling of these growths using combined full-wave electromagnetic and Monte Carlo growth simulations successfully reproduced the experimental morphologies and quantitatively agreed with the pattern orientations observed experimentally by considering only the fundamental light-material interactions during growth. Deposition with light from two orthogonally polarized same-wavelength as well as different-wavelength sources produced structures that consisted of two intersecting sets of orthogonally oriented lamellae in which the relative heights of the two sets could be varied by adjusting the relative source intensities. Simulations of light absorption were performed in analogous, idealized intersecting lamellar structures and revealed that the lamellae preferentially absorbed light polarized with the electric field vector along their long axes. These data sets cumulatively indicate that anisotropic light scattering and light absorption generated by the light polarization produces the anisotropic morphology and that the resultant morphology is a function of all illumination inputs despite differing polarizations.

Original languageEnglish
Pages (from-to)102-111
Number of pages10
JournalACS Nano
Volume10
Issue number1
DOIs
Publication statusPublished - Jan 26 2016

Fingerprint

Polarization
polarization
lamella
synthesis
Lamellar structures
Light polarization
Light scattering
Light absorption
electromagnetic absorption
linear polarization
light scattering
Wavelength
simulation
Electromagnetic waves
wavelengths
polarized light
Lighting
Electric fields
electromagnetic radiation
templates

Keywords

  • Chalcogenide
  • Electrodeposition
  • Maskless
  • Photodeposition
  • Photoelectrochemistry
  • Template-free

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Polarization control of morphological pattern orientation during light-mediated synthesis of nanostructured se-Te films. / Carim, Azhar I.; Batara, Nicolas A.; Premkumar, Anjali; Atwater, Harry A.; Lewis, Nathan S.

In: ACS Nano, Vol. 10, No. 1, 26.01.2016, p. 102-111.

Research output: Contribution to journalArticle

Carim, Azhar I. ; Batara, Nicolas A. ; Premkumar, Anjali ; Atwater, Harry A. ; Lewis, Nathan S. / Polarization control of morphological pattern orientation during light-mediated synthesis of nanostructured se-Te films. In: ACS Nano. 2016 ; Vol. 10, No. 1. pp. 102-111.
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