Abstract
Nano- and micro- fibers of conjugated polymer semiconductors are particularly interesting both for applications and for fundamental research. They allow an investigation into how electronic properties are influenced by size confinement and chain orientation within microstructures that are not readily accessible within thin films. Moreover, they open the way to many applications in organic electronics, optoelectronics and sensing. Electro-spinning, the technique subject of this review, is a simple method to effectively form and control conjugated polymer fibers. We provide the basics of the technique and its recent advancements for the formation of highly conducting and high mobility polymer fibers towards their adoption in electronic applications.
Highlights
Conjugated polymers offer the possibility to develop flexible and light-weight opto-electronic applications thanks to their solubility and low-temperature processing [1,2,3]
We provide the basics of the technique and its recent advancements for the formation of highly conducting and high mobility polymer fibers towards their adoption in electronic applications
Despite generally thought for thin-film-based electronics, their formation within the cylindrical shape of the electro-spun fiber introduces many appealing aspects: a reduced amount of material consumption along with the intrinsic confinement of the active area, an increased surface-to-volume ratio for better functional interfacing, improved flexibility and the possibility to finely pattern the active area just through the definition of the number and the direction of the nano-/micro-fibers employed within a device geometry; from a fundamental point of view, electro-spun nano-fibers may represent model systems for mono-dimensional charge transport study
Summary
Conjugated polymers offer the possibility to develop flexible and light-weight opto-electronic applications thanks to their solubility and low-temperature processing [1,2,3]. In the case of semiconductors we have focused on fibers based field-effect transistors, seen both as a way to extract charge carriers mobility and as a building block for future logic functions in smart textiles (Section 4.3). In this context we pay particular attention in describing the advantages and limits of different methodologies followed in the literature to extract mobility and threshold voltage parameters (Section 4.1). The results of a survey of conductivities and carriers mobility achieved so far in polymer fibers have been reported in Tables 1 and 2
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