Field-effect transistors based on self-organized molecular nanostripes.
Charge transport properties in organic semiconductors depend strongly on molecular order. Here we demonstrate field-effect transistors where drain current flows through a precisely defined array of nanostripes made of crystalline and highly ordered molecules. The molecular stripes are fabricated across the channel of the transistor by a stamp-assisted deposition of the molecular semiconductors from a solution. As the solvent evaporates, the capillary forces drive the solution to form menisci under the stamp protrusions. The solute precipitates only in the regions where the solution is confined by the menisci once the critical concentration is reached and self-organizes into molecularly ordered stripes 100-200 nm wide and a few monolayers high. The charge mobility measured along the stripes is 2 orders of magnitude larger than the values measured for spin-coated thin films.
Cavallini
Massimiliano
M
CNR, Institute for the Study of Nanostructured Materials, Nanotechnology of Multifunctional Materials Research Division, Via P. Gobetti 101, I-40129 Bologna, Italy.
Stoliar
Pablo
P
Moulin
Jean-François
JF
Surin
Mathieu
M
Leclère
Philippe
P
Lazzaroni
Roberto
R
Breiby
Dag Werner
DW
Andreasen
Jens Wenzel
JW
Nielsen
Martin M
MM
Sonar
Prashant
P
Grimsdale
Andrew C
AC
Müllen
Klaus
K
Biscarini
Fabio
F
D003460:Crystallization / Q000379:methods*; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005461:Fluorine / Q000737:chemistry*; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D013876:Thiophenes / Q000737:chemistry*; D014173:Transistors, Electronic
D013876:Thiophenes; C019101:alpha-terthienyl; D005461:Fluorine