Functional engineering of hybrid heterostructures for application in electronic, optical and optoelectronic nanostructured devices

Moschetto, Salvatore (2023) Functional engineering of hybrid heterostructures for application in electronic, optical and optoelectronic nanostructured devices, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Nanoscienze per la medicina e per l'ambiente, 35 Ciclo. DOI 10.48676/unibo/amsdottorato/10610.
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Interfacing materials with different intrinsic chemical-physical characteristics allows for the generation of a new system with multifunctional features. Here, this original concept is implemented for tailoring the functional properties of bi-dimensional black phosphorus (2D bP or phosphorene) and organic light-emitting transistors (OLETs). Phosphorene is highly reactive under atmospheric conditions and its small-area/lab-scale deposition techniques have hampered the introduction of this material in real-world applications so far. The protection of 2D bP against the oxygen by means of functionalization with alkane molecules and pyrene derivatives, showed long-term stability with respect to the bare 2D bP by avoiding remarkable oxidation up to 6 months, paving the way towards ultra-sensitive oxygen chemo-sensors. A new approach of deposition-precipitation heterogeneous reaction was developed to decorate 2D bP with Au nanoparticles (NP)s, obtaining a “stabilizer-free” that may broaden the possible applications of the 2D bP/Au NPs interface in catalysis and biodiagnostics. Finally, 2D bP was deposited by electrospray technique, obtaining oxidized-phosphorous flakes as wide as hundreds of µm2 and providing for the first time a phosphorous-based bidimensional system responsive to electromechanical stimuli. The second part of the thesis focuses on the study of organic heterostructures in ambipolar OLET devices, intriguing optoelectronic devices that couple the micro-scaled light-emission with electrical switching. Initially, an ambipolar single-layer OLET based on a multifunctional organic semiconductor, is presented. The bias-depending light-emission shifted within the transistor channel, as expected in well-balanced ambipolar OLETs. However, the emitted optical power of the single layer-based device was unsatisfactory. To improve optoelectronic performance of the device, a multilayer organic architecture based on hole-transporting semiconductor, emissive donor-acceptor blend and electron-transporting semiconductor was optimized. We showed that the introduction of a suitable electron-injecting layer at the interface between the electron-transporting and light-emission layers may enable a ≈ 2× improvement of efficiency at reduced applied bias.

Tipologia del documento
Tesi di dottorato
Moschetto, Salvatore
Dottorato di ricerca
Settore disciplinare
Settore concorsuale
Parole chiave
Heterostructures, Phosphorene, Epitaxy, optoelectronics, Nanostructures, in-situ functionalization, electrospray, electro-responsive, 2D materials, non-covalent functionalization, surface-engineering, organic light-emitting transistors, light-emitting device, oligothiophenes, n-type organic semiconductor, electron-injection layer
Data di discussione
23 Giugno 2023

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