Molecular Orientation and Field-effect Transistors of a Rigid Rod Conjugated Polymer Thin Films

Abstract

Molecular orientation in thin films of a rigid rod conjugated polymer, a derivative of poly(para-phenylene ethynylene)s with linear side chains and thioacetyl end groups, was investigated by reflection-absorption infrared spectroscopy and X-ray diffraction technique. The results indicated that TA-PPE molecules tended to align with their backbone planes perpendicular to substrates, that is, with an "edge-on" molecular orientation in the films. Such molecular orientation is favorable for the efficient carrier transport in two-dimensional direction in the polymer films (i.e., via both the intrachain and interchain), so that high performance organic field-effect transistors were fabricated with hole mobility at around approximately 4.3 x 10(-3) cm(2)/Vs.

Improved Thin‐Film Transistor Performance Through a Melt of Poly(para‐phenyleneethynylene)

“…Overall, for all annealed samples, the diameter of the fibers was found to be ≈50 nm (Figure S5 and Table S3, Supporting Information). Compared to grown poly(2,5‐dihexyloxy‐ p ‐phenyleneethynylene) (H‐OPPE) nanowires by Dong et al, they are around four times thicker, while the length seems to fit well with the high density nanowire‐net. Further investigations with transmission electron microscopy (TEM) showed two pronounced diffraction peaks at 4.6 and 5.4 Å for the carefully annealed thin film.…”

“…Poly( para ‐phenyleneethynylene)s (PPEs) are promising semiconductors and have proven their applicability as functional materials in photoswitches, polymer field‐effect transistors (PFETs), and sensors . However, their capability as hole transport materials is not yet fully exploited.…”

Preparation and Self‐Repairing of Highly Oriented Structures of Ultrathin Polymer Films

“…This has actually been demonstrated for many polymer systems. Poly(para‐phenylene ethynylene)s with thioacetyl end groups (TA‐PPE), a rigid rod conjugated polymer, is taken as an example here . Figure shows the photoresponse and photoswitch behavior of photoswitchers based on uniaxially and randomly oriented TA‐PPE films, respectively.…”

Donor–Acceptor 1,4‐Fluorenylene Chromophores: Photophysics, Electrochemistry, and Synthesis through a Route for Asymmetric Chromophore Preparation

“…This trend stems, in part, from the advantages that such materials hold for certain organic photonic and electronic applications such as nonlinear optics (NLO) [2][3][4][5][6][7][8] and organic photovoltaics. [13] These materials are also useful in applications including laser dyes, field-effect transistors (FETs), [14,15] memory storage devices and electrochemical supercapacitors, [16] and as dyes for bio- [13] These materials are also useful in applications including laser dyes, field-effect transistors (FETs), [14,15] memory storage devices and electrochemical supercapacitors, [16] and as dyes for bio-…”