Supersonic molecular beams deposition is a powerful method to study the growth processes of organic molecular semiconductors. The possibility to tune the kinetic energy of the impinging molecules such as their momentum open different pathway not accessible with other vacuum deposition techniques. An example is given by the study made on pentacene growth (Chemical Communication [50 (2014) 7694]) where we demonstrated the role played in the growth processes by the perpendicular and parallel components of momentum in hyperthermal Pentacene. The first one drives the molecules - molecules interactions (i.e. island nucleation processes). The second one the interactions between surface and molecules (i.e. the sticking coefficient, and island fractality)
In this way, we can optimize the molecular assembling improving the thin film order and consequently the electronic properties of realized devices. In fact, the supramolecular assembling processes give the possibility to realize devices with better functionality for application in sensing, to fabricate light emitting devices and photovoltaic cells. We have fabricated sensors based on FET of pentacene to detect gasses, while for application to detect analytes in solution we are developing organic FET devices based on biofunctionalized surface to increase the selectivity and the sensitivity of our active FET.
The molecular doping are studied to develop a new class of emitting devices and photovoltaic cells.
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