Journal
NANOSCALE
Volume 11, Issue 42, Pages 20171-20178Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr06899f
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Funding
- DARPA [W911NF18-1-0041]
- UC Office of the President under the UC Laboratory Fees Research Program Collaborative Research and Training Award [LFR-17-477148]
- International Research Agendas program of the Foundation for Polish Science
- European Union under the European Regional Development Fund [MAB/2018/9]
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We report measurements of low-frequency electronic noise in ordered superlattice, weakly-ordered and random-packed thin films of 6.5 nm PbSe quantum dots prepared using several different ligand chemistries. For all samples, the normalized noise spectral density of the dark current revealed a Lorentzian component, reminiscent of the generation-recombination noise, superimposed on the 1/f background (f is the frequency). An activation energy of similar to 0.3 eV was extracted from the temperature dependence of the noise spectra in the ordered and random quantum dot films. The noise level in the ordered films was lower than that in the weakly-ordered and random-packed films. A large variation in the magnitude of the noise spectral density was also observed in samples with different ligand treatments. The obtained results are important for application of colloidal quantum dot films in photodetectors.
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