title: Pulsed laser annealing of thin films of self-assembled nanocrystals.
abstract: We investigated how pulsed laser annealing can be applied to process thin films of colloidal nanocrystals (NCs) into interconnected nanostructures. We illustrate the relationship between incident laser fluence and changes in morphology of PbSe NC films relative to bulk-like PbSe films. We found that laser pulse fluences in the range of 30 to 200 mJ/cm(2) create a processing window of opportunity where the NC film morphology goes through interesting transformations without large-scale coalescence of the NCs. NC coalescence can be mitigated by depositing a thin film of amorphous silicon (a-Si) on the NC film. Remarkably, pulsed laser annealing of the a-Si/PbSe NC films crystallized the silicon while NC morphology and translational order of the NC film are preserved.
authors.affiliation: Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.
authors.forename: William J
authors.initials: WJ
authors.lastname: Baumgardner
authors.forename: Joshua J
authors.initials: JJ
authors.lastname: Choi
authors.forename: Kaifu
authors.initials: K
authors.lastname: Bian
authors.forename: Lena Fitting
authors.initials: LF
authors.lastname: Kourkoutis
authors.forename: Detlef-M
authors.initials: DM
authors.lastname: Smilgies
authors.forename: Michael O
authors.initials: MO
authors.lastname: Thompson
authors.forename: Tobias
authors.initials: T
authors.lastname: Hanrath
mesh_terms: D003102:Colloids; D007834:Lasers; D053758:Nanoparticles
chemical_list: D003102:Colloids