Browsing by Author "Facchetti, A. F."

Now showing 1 - 4 of 4

Citation - WoS: 1
Citation - Scopus: 2
Interface Engineering in Organic Thin Film Transistors
(Institute of Electrical and Electronics Engineers Inc., 2017) Liguori, R.; Fusco, Sandra; Rubino, Alfredo; Usta, Hakan; Facchetti, A. F.
A novel semiconductor, the small molecule C6-NTTN, was used to fabricate organic thin film transistors (OTFTs). Different architectures and deposition techniques were employed, together with various surface treatments of the substrate, insulator and metal contacts, whose effect is analyzed through atomic force microscopy. The aim is to investigate the relationship between the process parameters and the electrical performance, with a particular attention to the quality of interfaces between active layers. The proportionality between the charge carrier mobility and the interface trap density was studied. © 2018 Elsevier B.V., All rights reserved.
Citation - Scopus: 8
Organic Semiconductors for Transparent Electronics
(wiley, 2018) Usta, Hakan; Facchetti, A. F.
A relatively unexplored, yet important, research focus has been to develop optically transparent organic semiconductor thin films with efficient charge-transport characteristics. This chapter focuses on transparent organic semiconductors. Organic thin-film transistors (TFTs) are envisioned as key building blocks of next generation electronic technologies such as low-power-consumption flexible displays, electronic papers, plastic RFID tags, and sensors. The historic development of oligothiophene derivatives has significantly advanced the field of organic semiconductors for organic TFT and achieved record charge carrier mobilities for both hole and electron. In the past decade, organic semiconductor research has extensively focused on fused heteroacenes as a new promising class of p-type semiconductors. Rylene dicarboximides belong to one of the most popular and deeply studied classes of n-type semiconductors. Among the rylene dicarboximide semiconductors developed in the past two decades for organic electronics, only pyromelliticdicarboximides (PyDI) and naphthalenedicarboximides (NDI) have the potential for use in transparent electronics. © 2025 Elsevier B.V., All rights reserved.
Citation - Scopus: 2
Paper-Based Substrates for Sustainable (OPTO)Electronic Devices
(Elsevier, 2022) Usta, Hakan; Facchetti, A. F.
Cellulose-based paper has been a convenient eco-friendly platform for storing and exchanging information for thousands of years. Amazingly, the studies and advancements in the past decade have demonstrated that paper and nanocellulose-based substrates are also attractive for fabricating flexible electronic circuits as well as optoelectronic components and devices. Paper and nanocellulose-based substrates have been considered for use in new generation green devices and optoelectronic applications based on their sustainable and inexpensive source, lightweight, and superior mechanical/optical properties, all factors that could also reduce manufacturing costs for producing these devices. In this chapter, we review functional materials and optoelectronic devices fabricated on paper or nanocellulose-based substrates including transistors and circuits, solar cells, light-emitting diodes, and other devices, such as sensors/actuators, batteries, supercapacitors/energy-harvesters, and breathalyzer/diagnosis devices. We also thoroughly discuss remaining challenges and promising research directions with paper-based substrates for future advancements in green optoelectronics. © 2022 Elsevier B.V., All rights reserved.
Citation - Scopus: 19
Polymeric and Small-Molecule Semiconductors for Organic Field-Effect Transistors
(wiley, 2015) Usta, Hakan; Facchetti, A. F.
This chapter reviews the achievements in the development of molecular and polymeric semiconductors for charge transport in thin-film transistors (TFTs). In particular, it introduces the basic concepts of organic semiconductor structure and organic thin-film transistor (OTFT) operation and then focuses on initial studies and works. Organic semiconductors for OTFTs must possess two essential structural features for their successful implementation in printed electronics. The first feature is a π-conjugated core/chain composed of linked unsaturated units. The second feature is core functionalization with solubilizing substituents, which is essential for inexpensive manufacture by solution methods as well as for enhancing solid-state core interactions. There are several advantages in using polymeric versus molecular p-conjugated semiconductors. Isoindigo has become a popular conjugated moiety in polymer semiconductor design because of its strong electron-withdrawing character. Polymeric p-channel TFTs have reached new heights, with hole mobilities unthinkable only few years back and surpassing 10 cm2V-1 s-1. © 2018 Elsevier B.V., All rights reserved.