Ordered assembly of alpha-quinquethiophene on a copper oxide nanotemplate.
The organic semiconductor alpha-quinquethiophene (T5) is used as the active layer in organic field-effect transistors. We have investigated the adsorption of T5 on the (110) surface of copper and on the CuO nanotemplate formed by the high-temperature exposure of Cu(110) to molecular oxygen. The results were obtained with high-resolution scanning tunneling microscopy (STM) under ultra-high-vacuum (UHV) conditions. The adsorption of T5 on copper is an important model system because it mimics the active-layer-electrode interface in organic devices. The molecules were observed to adsorb onto both the pristine Cu(110) surface and the CuO nanotemplate, showing a greater affinity for the pristine copper surface. Surprisingly, however, the T5 molecules assembled with a much higher degree of long-range order on the oxygen-passivated portion of the surface.
Cicoira
Fabio
F
INRS Energie, Matériaux et Télécommunications, Université du Québec, 1650 Boulevard Lionel Boulet, Varennes, QC, Canada.
Miwa
Jill A
JA
Melucci
Manuela
M
Barbarella
Giovanna
G
Rosei
Federico
F
D000327:Adsorption; D003300:Copper / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D018625:Microscopy, Atomic Force; D016252:Microscopy, Scanning Tunneling / Q000379:methods*; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D012666:Semiconductors; D013499:Surface Properties; D013696:Temperature; D014961:X-Ray Diffraction
D003300:Copper; D010100:Oxygen; C000520:cuprous oxide