Abstract
n-type GaP(111) has been porosified in HCl, H2SO4, HBr, NaBr, and alkaline NaBr in the dark. The pore morphology strongly depends on the electrochemical conditions and on the chemical nature of anions in the electrolyte. Independent of the pH-value of bromide-containing solutions, layers of triangular pores with a defined cross-section were growing under an irregular pore nucleation layer. Optimized conditions led to a regular structure of equally sized triangular pores with a side length of (98 ± 5) nm. The pore walls are determined by (110)-crystal planes of GaP. In other electrolytes such as HCl or H2SO4 it was not possible to form triangular pores during the electrochemical etching process.
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Acknowledgements
This work was carried out at University Erlangen-Nuremberg (Germany). M. Czupalla from the Institute for Crystal Growth (IKZ) in Berlin is greatly acknowledged for providing the n-GaP(111)-samples. B. Rackl is acknowledged for fruitful discussion.
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Müller, K., Wloka, J. & Schmuki, P. Novel pore shape and self-organization effects in n-GaP(111). J Solid State Electrochem 13, 807–812 (2009). https://doi.org/10.1007/s10008-008-0771-4
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DOI: https://doi.org/10.1007/s10008-008-0771-4