Electrochemical formation of porous GaP in aqueous HNO3

R.W. Tjerkstra

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Porous gallium phosphide was produced by anodic etching of n-type GaP in an aqueous solution of 1 M HNO3. At potentials lower than 15.5 V, yellow porous samples were obtained, of which the pore size was around 45% larger than the pores obtained in 0.5 M H2SO4. At potentials around 15.5 V electropolishing occurred. No pores formed when GaP was etched at potentials in this range. At potentials higher than approximately 15.5 V the current density increased strongly with increasing potential, and very large pores formed. It was found that NO<sub>3</sub><sup>-</sup> and SO<sub>4</sub><sup>2-</sup> only play a role in the chemical dissolution of the oxide layer that forms during etching.
Original languageUndefined
Pages (from-to)c81-c84
Number of pages4
JournalElectrochemical and solid-state letters
Issue number5
Publication statusPublished - 2006


  • IR-61695
  • METIS-233411

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