title: Surface-potential undulation of Alq3 thin films prepared on ITO, Au, and n-Si.
abstract: The surface potential (SP) morphology on thin films of tris(8-hydroxyquinolinato) aluminum (Alq3) was investigated with Kelvin probe force microscopy. Thin Alq3 films of 100 nm were prepared on ITO/glass substrates, Au/mica substrates, and n-Si substrates. Cloud-like morphologies of the SP undulation with 200-400 nm in lateral size were observed for all three types of the substrates. New larger peaks were observed in the cloud-like morphologies when the surfaces were exposed shortly to a light, while the SP average was reduced monotonically. The nonuniform distribution of charged traps and mobility was deduced from the SP undulation morphology and its photoexposure dependences.
authors.affiliation: RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: Kazunari
authors.initials: K
authors.lastname: Ozasa
authors.forename: Hiromi
authors.initials: H
authors.lastname: Ito
authors.forename: Mizuo
authors.initials: M
authors.lastname: Maeda
authors.forename: Masahiko
authors.initials: M
authors.lastname: Hara
mesh_terms: D004574:Electromagnetic Fields; D005898:Glass / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D008422:Materials Testing; D008567:Membranes, Artificial; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D009942:Organometallic Compounds / Q000737:chemistry*; D010316:Particle Size; D012825:Silicon / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D008567:Membranes, Artificial; D009942:Organometallic Compounds; C500391:tris(8-quinolinolato-N1,O8)aluminum; D006046:Gold; D012825:Silicon