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Published August 10, 2016 | Supplemental Material
Journal Article Open

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


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.

Additional Information

© 2016 American Chemical Society. Received: May 2, 2016; Revised: June 7, 2016. Publication Date (Web): June 20, 2016. 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 DESC0001293. The computational methods in this work used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. This work was also supported in part by the National Science Foundation under Grant No. CHE-1214152 (support for N.S.L.). M.D. acknowledges a Postdoctoral Fellowship from the National Sciences and Engineering Research Council of Canada. A.I.C. acknowledges a Graduate Research Fellowship from the National Science Foundation. The authors gratefully acknowledge R. Jones and Dr. K. Walczak for assistance with photo electrochemical cell fabrication. Author Contributions: M.D. and A.I.C. contributed equally to this work. The authors declare no competing financial interest.

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August 20, 2023
October 20, 2023