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Self-Optimizing Photoelectrochemical Growth of Nanopatterned Se–Te Films in Response to the Spectral Distribution of Incident Illumination

Carim, Azhar I. and Batara, Nicolas A. and Premkumar, Anjali and Atwater, Harry A. and Lewis, Nathan S. (2015) Self-Optimizing Photoelectrochemical Growth of Nanopatterned Se–Te Films in Response to the Spectral Distribution of Incident Illumination. Nano Letters, 15 (10). pp. 7071-7076. ISSN 1530-6984. doi:10.1021/acs.nanolett.5b03137.

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Photoelectrochemical growth of Se–Te films spontaneously produces highly ordered, nanoscale lamellar morphologies with periodicities that can be tuned by varying the illumination wavelength during deposition. This phenomenon has been characterized further herein by determining the morphologies of photoelectrodeposited Se–Te films in response to tailored spectral illumination profiles. Se–Te films grown under illumination from four different sources, having similar average wavelengths but having spectral bandwidths that spanned several orders of magnitude, all nevertheless produced similar structures which had a single, common periodicity as quantitatively identified via Fourier analysis. Film deposition using simultaneous illumination from two narrowband sources, which differed in average wavelength by several hundred nanometers, resulted in a structure with only a single periodicity intermediate between the periods observed when either source alone was used. This single periodicity could be varied by manipulating the relative intensity of the two sources. An iterative model that combined full-wave electromagnetic effects with Monte Carlo growth simulations, and that considered only the fundamental light-material interactions during deposition, was in accord with the morphologies observed experimentally. Simulations of light absorption and concentration in idealized lamellar arrays, in conjunction with all of the available data, additionally indicated that a self-optimization of the periodicity of the nanoscale pattern, resulting in the maximization of the anisotropy of interfacial light absorption in the three-dimensional structure, is consistent with the observed growth process of such films.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Carim, Azhar I.0000-0003-3630-6872
Atwater, Harry A.0000-0001-9435-0201
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2015 American Chemical Society. Received: August 7, 2015. Revised: September 16, 2015. Publication Date (Web): September 21, 2015. This work was supported by the “Light-Material Interactions in Energy Conversion” Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001293. The authors gratefully acknowledge R. Gerhart for assistance with photoelectrochemical cell fabrication. A.I.C. acknowledges a Graduate Research Fellowship from the National Science Foundation. A.P. acknowledges an Edward W. Hughes Research Fellowship from the California Institute of Technology. The authors declare no competing financial interest.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0001293
NSF Graduate Research FellowshipUNSPECIFIED
Edward W. Hughes Research FellowshipUNSPECIFIED
Subject Keywords:Electrodeposition; photoelectrochemistry; photodeposition; template-free; maskless; chalcogenide
Issue or Number:10
Record Number:CaltechAUTHORS:20151005-115233487
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Official Citation:Self-Optimizing Photoelectrochemical Growth of Nanopatterned Se–Te Films in Response to the Spectral Distribution of Incident Illumination Azhar I. Carim, Nicolas A. Batara, Anjali Premkumar, Harry A. Atwater, and Nathan S. Lewis Nano Letters 2015 15 (10), 7071-7076 DOI: 10.1021/acs.nanolett.5b03137
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60761
Deposited By: George Porter
Deposited On:06 Oct 2015 15:42
Last Modified:10 Nov 2021 22:38

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