title: Electrical conduction of organic ultrathin films evaluated by an independently driven double-tip scanning tunneling microscope.
abstract: The electrical transport properties of organic thin films within the micrometer scale have been evaluated by a laboratory-built independently driven double-tip scanning tunneling microscope, operating under ambient conditions. The two tips were used as point contact electrodes, and current in the range from 0.1 pA to 100 nA flowing between the two tips through the material can be detected. We demonstrated two-dimensional contour mapping of the electrical resistance on a poly(3-octylthiophene) thin films as shown below. The obtained contour map clearly provided an image of two-dimensional electrical conductance between two point electrodes on the poly(3-octylthiophene) thin film. The conductivity of the thin film was estimated to be (1-8) × 10(-6) S cm(-1). Future prospects and the desired development of multiprobe STMs are also discussed.
authors: Department of Precision Science and Technology, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan.
authors: K
authors: K
authors: Takami
authors: S
authors: S
authors: Tsuruta
authors: Y
authors: Y
authors: Miyake
authors: M
authors: M
authors: Akai-Kasaya
authors: A
authors: A
authors: Saito
authors: M
authors: M
authors: Aono
authors: Y
authors: Y
authors: Kuwahara
mesh_terms: D004553:Electric Conductivity; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D004867:Equipment Design; D018625:Microscopy, Atomic Force / Q000379:methods; D016252:Microscopy, Scanning Tunneling / Q000295:instrumentation* / Q000379:methods; D049329:Nanostructures / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D009930:Organic Chemicals / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D013499:Surface Properties; D013876:Thiophenes / Q000737:chemistry
chemical_list: D009930:Organic Chemicals; D011108:Polymers; D013876:Thiophenes; C088351:poly(3-octylthiophene)