Crystals (Mar 2019)

Determination of Diffusion Coefficient of Copper in ZnO (001) Single Crystals at 1000 °C

  • Primavera López-Salazar,
  • Gabriel Juárez-Díaz,
  • Javier Martínez-Juárez,
  • José A. Luna-López,
  • Ramón Peña Sierra,
  • Yuri Koudriavtsev,
  • Carlos Palomino-Jiménez,
  • Angel. P. Rodríguez-Victoria

DOI
https://doi.org/10.3390/cryst9030131
Journal volume & issue
Vol. 9, no. 3
p. 131

Abstract

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Copper from a solid source was diffused into undoped n-type bulk ZnO (001) single crystals at 1000 °C under a nitrogen atmosphere at different diffusion times. The Cu diffusion profiles were obtained by Secondary ion mass spectroscopy (SIMS), and the fitting reveals a diffusion case from a constant concentration source. A value for the diffusion coefficient of 2.42(±0.2) × 10−12 cm2∙s−1 was obtained. Electrical measurements present an increment of carrier concentration with diffusion time, but remains n-type which indicates an increase in the donor levels produced by structural defects in ZnO. Photoluminescence (PL) spectra showed an increment of green emission intensity associated with Cu incorporation.

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