Size-dependent conductivity type inversion in CU2O nanoparticles

B. Balamurugan, I. Aruna, B. R. Mehta, S. M. Shivaprasad

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64 Citations (Scopus)


X-ray photoemission spectroscopy and optical absorption studies have been carried out on Cu2O nanoparticles prepared using the activated reactive evaporation technique. A strong shift of the valence band edge (from 0.7 to 1.8 eV) has been observed on reduction of the nanoparticle size from 20 nm to 4 nm. The size-dependent modifications in the energy level diagram and metal-Cu2O nanoparticle Schottky junction characteristics confirm the observation of the inversion of conductivity type from p-type bulk conductivity to n-type conductivity in Cu2O nanoparticles at lower dimensions. This study can initiate a further methodology for tailoring the semiconductor properties of a material by controlling the nanoparticle size.

Original languageEnglish
Article number165419
JournalPhysical Review B (Condensed Matter)
Issue number16
Publication statusPublished - 29 Apr 2004


  • photoemission spectroscopy
  • Cu2O nanoparticles
  • nanoparticle conductivity


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