* * * * *
Thin films of organic pi-conjugated molecules are of great
interest for devices such as field effect transistors (FETs), light-emitting
field effect transistors, light-emitting diodes and photovoltaic cells.
Organic active materials are multifunctional, i.e. they can combine different
properties (e.g. charge-carrier transport and electroluminescence). There
is a myriad of organic molecules available so that the performance of
(opto-) electronic devices based on these molecules are finely tunable.
We will study the optoelectronic properties of organic semiconductors
investigating physical processes such as charge-carrier injection, transport
and electroluminescence in thin semiconducting films. The aim is to understand
how these processes are correlated with molecular structure, supramolecular
organization and the morphology and structure of the materials.
(Opto-)electronic devices based on organic semiconductors
and ferroelectric dielectrics.
One of the projects we will be working on consists in the design, fabrication
and characterization of multifunctional hybrid electronic devices based
on inorganic ferroelectric/organic materials i.e. FETs based on a semiconducting
organic active layer (O-FETs) and a ferroelectric gate oxide (FeO-FETs).
The latter opens up the possibility of low consumption, non-volatile memory
OFETs. In this project, attention will be paid to the investigation of
the interface organic active layer/ferroelectric gate oxide to contribute
to understand the electric field-effect induced in organic molecular semiconductors
by a polarized ferroelectric.
2D Polymers
With the aim to prepare novel organic materials with special
electronic properties, we will work at the the surface-confined polymerization
towards 2D conjugated organic polymers. For the preparation, we will select
the electrochemical method. The deposited material will be imaged by Scanning
Tunnelling Microscopy.
PUBLICATIONS
[17] F. Cicoira, C. Santato,
A.Dadvand, C. Harnagea, A. Pignolet, P. Bellutti, Z.
Xiang, F. Rosei, H. Meng, D. F. Perepichka, Environmentally
stable organic light emitting field effect transistors based on a tetracene
derivative (submitted).
[16] C.Santato, F. Cicoira,
Organic Light Emitting Field Effect transistors: Advances and Perspectives,
in press in Advanced Functional Materials.
[15] C. Santato, C. M. Lopez, K.-S. Choi, Synthesis and
characterization of polycrystalline Sn and SnO2 films with wire morphologies
Electrochemistry Communications, 2007, 9, 1519.
[14] Milita, C. Santato, F.
Cicoira, Structural investigation of thin tetracene films on
flexible substrate by Synchrotron X-ray Diffraction, accepted for publication
in Applied Surface Science.
[13] C. Santato, F. Cicoira, P. Cosseddu,
A. Bonfiglio, P. Bellutti, M. Muccini, R. Zamboni, F. Rosei,
A. Mantoux,P. Doppelt, Organic Light-Emitting Transistors that use concentric
source/drain electrodes on a molecular adhesion layer, Applied Physics
Letters 2006, 88, 163511 (selected for the May 1, 2006 issue of Virtual
Journal of Nanoscale Science & Technology).
[12] S. Milita, M. Servidori, F. Cicoira, C.
Santato, A. Pifferi Grazing incidence diffraction from thin tetracene
films in press in Nuclear Instruments and Methods B (available on line).
[11] F. Cicoira, C. Santato, M. Melucci,
L. Favaretto, M. Gazzano, M. Muccini, G. Barbarella Organic light-emitting
transistors based on solution cast and vacuum sublimed films of a rigid
core thiophene oligomer, Advanced Materials, 2006, 18,169.
[10] C. Santato, I. Manunza, A. Bonfiglio, F.
Cicoira, P.Cosseddu, R. Zamboni, M. Muccini Tetracene light-emitting
transistors on flexible plastic substrates, Applied Physics Letters, 2005,
86, 141106. (PDF)
[9] F. Cicoira, C. Santato, F. Dinelli,
M. Murgia, M. A. Loi, F. Biscarini, R. Zamboni, P. Heremans, M. Muccini
Correlation between morphology and field-effect transistor mobility in
tetracene thin films, Advanced Functional Materials 2005, 15, 375.
[8] R. Solarska, C. Santato, C. Jorand-Sartoretti, M.
Ulmann, J. Augustynski Photoelectrolytic oxidation of organic species
at mesoporous tungsten trioxide film electrodes under visible light illumination,
invited paper in Journal of Applied Electrochemistry, 2005, 135, 715.
[7] C. Santato, R. Capelli, M.A. Loi, M. Murgia, F.
Cicoira, V.A.L. Roy, P. Stallinga, R. Zamboni, C. Rost, S. Karg,
M. Muccini, Tetracene based Organic Light-Emitting Transistors: optoelectronic
properties and electron injection mechanis, Synthetic Metals, 2004, 146,
329
[6] C. Santato, G. Mattei, W. Ruihua, F. Mecarini, In
situ micro Raman investigation of the laser crystallization in Si thin
films plasma enhanced chemical vapor deposition-grown from He-diluted
SiH4, Journal of Applied Physics, 2004, 95, 5366-5372.
[5] C. Santato, M. Ulmann and J. Augustynski, Photoelectrochemical
properties of nanostructured tungsten trioxide films, Journal of Physical
Chemistry B, 2001, 105, 936.
[4] C. Santato, M. Ulmann and J. Augustynski, Enhanced
visible light conversion efficiency using nanocrystalline WO3 films, Advanced
Materials, 2001, 13, 511. (PDF)
[3] C. Santato, M. Oziemkowski, M. Ulmann, J. Augustynski,
Crystallographically oriented mesoporous WO3 films: synthesis, characterization
and applications, Journal of the American Chemical Society, 2001, 123,
10639. (PDF)
[2] M. Ulmann, C. Santato, J. Augustynski, V. Shklover,
Transparent nanosized tungsten trioxide films, Electrochemical Society
Proceedings Series, Pennington, NJ, 1997 (J. Mc Breen, S. Mukerjee, S.
Srinivasan editors).
[1] A. Deronzier, P. Jardon, A. Martre, J.-C. Moutet, C. Santato,
V. Balzani, A. Credi, F. Paolucci, S. Roffia, Photoredox pathways for
the polymerization of a pyrrole-substituted ruthenium tris (bipyridyl)
complex, New Journal of Chemistry, 1998, 22, 33. (PDF)
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