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We report measurements of low-frequency electronic noise in orderedsuperlattice, weakly-ordered and random-packed thin films of 6.5 nm PbSequantum dots prepared using several different ligand chemistries. For allsamples, the normalized noise spectral density of the dark current revealed aLorentzian component, reminiscent of the generation-recombination noise,superimposed on the 1/f background (f is the frequency). An activation energyof 0.3 eV was extracted from the temperature dependence of the noise spectra.The noise level in the ordered films was lower than that in the weakly-orderedand random-packed films. A large variation in the magnitude of the noisespectral density was also observed in samples with different ligand treatments.The obtained results are important for application of colloidal quantum dotfilms in photodetectors.

Low-Frequency Electronic Noise in Superlattice and Random-Packed Thin Films of Colloidal Quantum Dots