Ambipolar field-effect transistors using conjugated polymers with structures of bilayer, binary blends, and paralleled nanofibers

Abstract

An ambipolar field-effect transistor using paralleled nanofibers showed high and well-balanced mobilities of holes (0.082 cm2 V−1 s−1) and electrons (0.075 cm2 V−1 s−1).

Multilevel Photonic Transistor Memory Devices Based on 1D Electrospun Semiconducting Polymer /Perovskite Composite Nanofibers

“…In contrast to conventional film‐based semiconducting composites, a 1D composite nanostructure of conjugated polymer/βNC was formed by using a coaxial electrospinning technique to manipulate the molecular packing and preferred chain orientation of polythiophenes to enhance the charge transport performance, as reported in previous publications. [ 72–78 ] Furthermore, the integration of composite nanofiber as 1D photonic transistor can effectively enhance area density of the device and also simplify device architecture. It is critical to mention that PEO was used to produce aligned coaxial fibers due to the difficulty of forming fibers by pure polythiophene‐only solution because of its low solubility and viscosity, rigid polymer backbone, and high crystallinity.…”

“…These aligned composite nanofibers were subsequently transferred onto highly n‐doped and ODTS‐treated silicon (Si/SiO 2 ) substrates. The coaxial fibers were treated with methanol to remove the PEO shell from the conjugated polymer‐βNC core using an approach similar to that in our previous publications, [ 72–77 ] and the remaining fiber core was dried under vacuum for 12 h.…”

“…The coaxial (core‐shell) electrospinning process was performed by separately feeding the core and shell solutions to fabricate the core‐shell fibers, similar to that reported in the authors’ previous work. [ 72–77 ] As illustrated in Figure 1a, the coaxial (core‐shell) electrospun nanofibers were fabricated using two syringes connected to a coaxial spinneret with a diameter of 0.90 (for the inner one) and 1.25 mm (for the outer one) that were used to feed solutions by two syringe pumps (KD Scientific Model 100, USA). The core flow rate of the final core solution was fixed at 0.1 mL h −1 while the feed rates of PEO shell solution was fed at 1.0 mL h −1 .…”

“…[ 54–71 ] In particular, this technique could enhance the molecular packing and preferred orientation of conjugated polymer chains in a 1D confined structure, resulting in superior transport properties with a high carrier mobility. [ 72–76 ] Nanoparticles containing conjugated polymer nanofibers exhibit good electrical memory device characteristics under a low operating voltage owing to increased electric field generation in the 1D semiconducting channel. Our group developed a flexible transistor memory by embedding gold nanoparticles into a p‐type P3HT nanofiber matrix exhibiting memory storage capability under a low operating voltage.…”

“…Various polythiophenes, including poly(3‐hexylthiophene) (P3HT), poly[4,4′‐bis‐9,2‐butyloctyl)‐(5,5′‐2,2′‐bithiophene)‐ alt ‐5,5′‐2,2′‐bithiophene] (PQT), and poly(3‐hexylthiophene‐ co ‐thiophene) (RP‐17), were applied as a semiconducting channel of the nanofiber matrix based on the nanofiber‐based transistor concept in previous studies. [ 72–77 ] The morphology and crystallinity of both the perovskite nanoparticles and conjugated polymer nanofibers were investigated to scrutinize the molecular alignment and polymer chain packing in the confined coaxial electrospun fibers. The time‐dependent programming of composite nanofibers was used to examine the photo‐excited charge trapping and depletion behavior of the nanofibers.…”