6533b7d2fe1ef96bd125e06d
RESEARCH PRODUCT
Tetrathiotetracene thin film morphology and electrical properties
Simon WoodwardKaspars PudzsJanis BusenbergsAivars VembrisMārtiņš Rutkissubject
Materials scienceMorphology (linguistics)Base (chemistry)thin filmScanning electron microscopeAnalytical chemistry02 engineering and technologyConductivity010402 general chemistry01 natural sciencestetrathiotetraceneElectrical resistivity and conductivitymorphologyMaterials ChemistryDeposition (phase transition)Thin filmchemistry.chemical_classificationelectrical conductivityMetals and AlloysSurfaces and Interfaces021001 nanoscience & nanotechnologyEvaporation (deposition)0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic Materialschemistry0210 nano-technologydescription
The electrical properties of organic thin films are determined by their chemical constituents and the morphology of the films deposited. In this paper the morphology of vacuum sublimed (7?10-6 mbar) tetrathiotetracene (TTT) thin films is shown to be strongly affected by the thermal deposition temperature (222-350 K) and rate of deposition. Mostly needle-like morphologies are identified by scanning electron microscopy. Optimal TTT purity (a pre-requisite for device preparation via subsequent oxidation) is evidenced by their initially low electrical conductivity. Altering the TTT morphology, by variation of the evaporation parameters, strongly affects this base electrical conductivity. Four probe conductivity measurements and charge extraction by linear increasing voltage methods are used to characterize film electrical properties. In-plane conductivity of up to 7.03?10-5 S/cm is achieved for pure TTT thin films. Subsequent aerial oxidation resulted in a 3.4-fold increase in electrical conductivity.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-12-11 | Thin Solid Films |