Spectral analysis of current fluctuations in CdS nanocombs and nanowires array

The field emission studies and, in particular, spectral analysis of field emission current from CdS nanocombs and nanowires array have been carried out at a base pressure of ~1×10^-8 mbar. The CdS nanocombs and nanowires array are found to exhibit step like fluctuations in the field emission current. The power spectra for nanocombs and nanowires array show slope values ~2 and ~1.8, respectively, implying that the field emission current fluctuations occur due to the generation-recombination of charge carriers at surface states.