High‐Performance FETs Prepared From Electrospun Aligned P4TDPP Nanofibers

Abstract

The morphology and charge transport characteristics of electrospun aligned nanofi bers based on the 2D conjugated polythiophene derivative P4TDPP are studied. The crystallinity, orientation, and molecular packing of P4TDPP nanofi bers are signifi cantly enhanced by a crystalline-induced technique. P4TDPP nanofi ber transistors exhibit a high hole mobility of 0.305 cm 2 V − 1 s − 1 and on/off ratio of 1.30 × 10 5 , which is signifi cantly higher than that of the corresponding spin-coated fi lm (2.10 × 10 − 2 cm 2 V − 1 s − 1 ). The experimental results suggest that high-performance FETs can be obtained from electrospun aligned nanofi bers of crystalline conjugated polymers.

Organic Nanowire Fabrication and Device Applications

“…The author improved performance (hole mobility of 0.192 cm 2 ·V −1 ·s −1 and I on /I off of 4.45 × 10 4 ) by analyzing the crystalline structure and orientation of P3HT chain in nanofibers with a suitable control of the shell flow rate and annealing temperature. This group extended their research by reporting the two‐dimensional (2D) conjugated polythiophene derivative, poly{[2′,5″‐5,5″′‐di(2‐ethylhexyl)‐3′;5′,2″;4″,2″′]quaterthiophene‐ alt ‐3,6‐dithien‐2‐yl‐2,5‐di(2‐ethylhexyl)‐pyrrolo[3,4‐c]pyrrole‐1,4‐dione‐5′,5″‐diyl]} (P4TDPP) . The crystallinity, orientation, and molecular packing of P4TDPP nanofibers are significantly enhanced by a crystalline‐induced procedure with the result that the average hole mobility of the P4TDPP electrospun nanofiber transistors was 0.305 cm 2 ·V −1 ·s −1 , and I on /I off was 1.30 × 10 5 , higher than that of the spin‐coated film device.…”

“…The crystallinity, orientation, and molecular packing of P4TDPP nanofibers are significantly enhanced by a crystalline‐induced procedure with the result that the average hole mobility of the P4TDPP electrospun nanofiber transistors was 0.305 cm 2 ·V −1 ·s −1 , and I on /I off was 1.30 × 10 5 , higher than that of the spin‐coated film device. Although Chen et al and Lin et al could align the nanofibers to characterize the properties in fibers, however, previously introduced alignment methods of electrospun NWs have still some problems: i) poor position and direction addressability of aligned NW; ii) low uniformity of device characteristics on large‐area arrays.…”

Large‐Scale Direct‐Writing of Aligned Nanofibers for Flexible Electronics

“…Since Pinto et al proposed the first nanofiber‐based semiconductor through electrospinning of a blend of camphorsulfonic acid doped polyaniline and polyethylene oxide, many interests have been attracted toward this type of TFTs in the past decade, particularly the appearance of orderly deposition electrospun nanofibers, seen in Table 1 . With a rotating collecting electrode, Liu et al had fabricated a single aligned electrospun poly(3‐hexylthiophene) (P 3 HT) nanofiber‐based TFT as shown in Figure a,b.…”

“…And the maximum on‐current could be controllably adjusted by the number of collected nanofibers as shown in Figure d. When associated with the coaxial‐electrospinning technique, well‐aligned high‐quality nanofibers with the uniform diameter and smooth surface could be fabricated, and this would result in a better electronic performance …”

Electrospinning for nano- to mesoscale photonic structures

“…For example, using nanofiber arrays, it has been demonstrated in conjugated polymers that interchain energy transfer occurs more quickly than intrachain energy migration [142], and increased stacking order of π-conjugated molecules in organic nanofibers gives them charge transport mobility and conductivity superior to that of thin films [36,118,143]. Supramolecular assembly of polymeric backbones also has demonstrated polarization of emitted photons [144][145][146], low threshold amplified spontaneous emission [147], and non-radiative energy transfer [148].…”