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Self-Assembled Molecular Nanowires for High-Performance Organic Transistors

Fleet, LR; Stott, J; Villis, B; Din, S; Serri, M; Aeppli, G; Heutz, S; (2017) Self-Assembled Molecular Nanowires for High-Performance Organic Transistors. ACS Applied Materials & Interfaces , 9 (24) pp. 20686-20695. 10.1021/acsami.7b01449. Green open access

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Abstract

While organic semiconductors provide tantalizing possibilities for low-cost, light-weight, flexible electronic devices, their current use in transistors—the fundamental building block—is rather limited as their speed and reliability are not competitive with those of their inorganic counterparts and are simply too poor for many practical applications. Through self-assembly, highly ordered nanostructures can be prepared that have more competitive transport characteristics; however, no simple, scalable method has been discovered that can produce devices on the basis of such nanostructures. Here, we show how transistors of self-assembled molecular nanowires can be fabricated using a scalable, gradient sublimation technique, which have dramatically improved characteristics compared to those of their thin-film counterparts, both in terms of performance and stability. Nanowire devices based on copper phthalocyanine have been fabricated with threshold voltages as low as −2.1 V, high on/off ratios of 10⁵, small subthreshold swings of 0.9 V/decade, and mobilities of 0.6 cm²/V s, and lower trap energies as deduced from temperature-dependent properties, in line with leading organic semiconductors involving more complex fabrication. High-performance transistors manufactured using our scalable deposition technique, compatible with flexible substrates, could enable integrated all-organic chips implementing conventional as well as neuromorphic computation and combining sensors, logic, data storage, drivers, and displays.

Type: Article
Title: Self-Assembled Molecular Nanowires for High-Performance Organic Transistors
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acsami.7b01449
Publisher version: http://dx.doi.org/10.1021/acsami.7b01449
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: image analysis, mobility, nanowire transistor, neuromorphic computing, organic electronics, phthalocyanine, random networks, stability, temperature dependence
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10061425
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