title: Synthesis and characterization of lead selenide nanocrystal quantum dots and wires.
abstract: Lead chalcogenide nanocrystalline materials offer possibilities of improving the efficiency of various optoelectric/thermoelectric applications, especially in solar cells, by generating more carriers with incoming photons, or by extending the bandgap toward the infra-red region. In this work, we suggest the synthetic approach of creating extended PbSe structures which shows better performances when incorporated into an electric device. Firstly, we synthesized monodisperse cubic-structured single-crystalline lead selenide nanocrystal quantum dots using lead acetate and oleic acid in non-coordinating solvent without additional surfactants. Also, single-crystal cubic PbSe nanowires were synthesized in a mixture of surfactants such as trioctylphosphine and phenyl ether. Morphologies of wires and dots were precisely controlled via reaction temperature and the surface ligands. Phenyl ether was found to facilitate the oriented attachment. Further, current-voltage characteristics of drop-casted 2D arrays of nanocrystalline materials were examined.
authors.affiliation: Nanomechanical Systems Research Division, Korea Institute of Machinery and Materials, Daejeon 305-701, Korea.
authors.forename: Weonsik
authors.initials: W
authors.lastname: Seo
authors.forename: Ju-Hyung
authors.initials: JH
authors.lastname: Yun
authors.forename: Yun Chang
authors.initials: YC
authors.lastname: Park
authors.forename: Chang-Soo
authors.initials: CS
authors.lastname: Han
authors.forename: Jihye
authors.initials: J
authors.lastname: Lee
authors.forename: Sohee
authors.initials: S
authors.lastname: Jeong