Abstract
In this work we report on the single-step synthesis of CdSe microwires with good crystalline characteristics by template-assisted electrochemical deposition from an electrolytic solution containing CdSO4 + SeO2 and sulfuric acid. Deposition was conducted at three different temperatures (25 °C, 60 °C and 80 °C) under potentiostatic control using a commercial nanoporous alumina membrane as the working electrode. The best results were obtained when the electrodeposition was carried out at E=-0.610 V vs. Ag/AgCl and T=80 °C. Under these experimental conditions, the microwires are uniform, well aligned, have a high packing density, and present a good crystalline character according to XRD analysis. TEM observations revealed that they are dense and continuous, with a mean diameter ranging from 360–380 nm, greater than the channel diameters of the alumina template used. A detailed study of the reflectance in the region close to CdSe bandgap energy allows the determination of a weak direct absorption edge at 1.65 eV, close to the bulk bandgap energy. The Raman spectra consist of a strong mode centered at 208 cm-1 arising from the LO phonon and a somewhat weak, but still strong, mode arising from the second order LO (2LO) appearing at 415 cm-1.
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78.30.Fs; 78.66.Hf; 82.45.Qr; 81.07.-b
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Riveros, G., Vásquez, J., Gómez, H. et al. Single-step electrodeposition of polycrystalline CdSe microwire arrays: structural and optical properties. Appl. Phys. A 90, 423–430 (2008). https://doi.org/10.1007/s00339-007-4318-9
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DOI: https://doi.org/10.1007/s00339-007-4318-9