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Cluster Beam Deposition of Lead Sulfide Nanocrystals into Organic Matrices

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journal contribution
posted on 26.08.2009, 00:00 by Adam M. Zachary, Igor L. Bolotin, Daniel J. Asunskis, Amanda T. Wroble, Luke Hanley
Lead sulfide nanocrystals (PbS NCs) were codeposited into two organic films, titanyl phthalocyanine (TiOPc) and α-sexithiophene, using cluster beam deposition (CBD). NCs of average diameters of ∼3−4 nm were evenly distributed in these organic films with average particle spacings of ∼4 nm, as determined by transmission electron microscopy. The film composition and NC surface chemistry were monitored by X-ray photoelectron spectroscopy (XPS) and other methods. Pb:S stoichiometry in the NC/TiOPc film was determined by XPS to correspond to the PbS cubic rock salt structure. Soft-XPS using 200 eV energy photons determined the NC−organic surface chemistry by resolving the S 2p core level into four distinct components for sulfur. The soft-XPS results found that the PbS NC surface chemistry could be tuned by varying the H2S/Ar gas ratio within the CBD source.