Flexible Organic Transistors with Controlled Nanomorphology

Abstract

We report the controlled nanomorphology of semiconducting polymers on chemically and mechanically stable nanogrooved polymer substrates. By employing silicon dioxide thin films with finely adjusted thicknesses on nanogrooved polymer substrates, semiconducting polymer thin films oriented and aligned along the nanogrooves were obtained. Organic field-effect transistors (OFETs) fabricated from the oriented semiconducting polymer, poly[4-(4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b']dithiophen-2-yl)-alt-[1,2,5]thiadiazolo-[3,4-c]pyridine] (PCDTPT), yielded saturation hole mobilities as high as 19.3 cm(2) V(-1 )s(-1), and the flexible "plastic" transistors demonstrated excellent mechanical stability under various bending conditions. These results represent important progress for solution-processed flexible OFETs and demonstrate that directed self-assembly of semiconducting polymers can be achieved by soft nanostructures.

Injection-modulated polarity conversion by charge carrier density control via a self-assembled monolayer for all-solution-processed organic field-effect transistors

“…Among these, OFETs have garnered tremendous attention because of their potential use in low-cost, lightweight and flexible electronic devices123456.…”

Engineering of Amorphous Polymeric Insulators for Organic Field‐Effect Transistors

“…Bao et al used a crosslinked PVP dielectric layer and realized robust OFETs with operating voltage lower than 1 V. Based on this system, they demonstrated very sensitive biodetectors and the analyte limit reached a few parts per billion in water. [88][89][90][91][92] …”

Electrical Performance of a Molecular Organic Semiconductor under Thermal Stress

“…The general molecular formula is similar to poly[2,6-(4,4-bis-(2ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]dithiophene)-alt-4,7(2,1,3benzothiadiazole)] (PCPDTBT) and poly [4-(4,4-dihexadecyl-4H-cyclopenta [1,2-b;5,4-b′]dithiophen-2-yl)-alt-thiadiazolo [3,4-c] pyridine] (PCDTPT) conjugated polymers, which have recently garnered significant attention due to their high performance. [19][20][21][22][23][24][25][26] Furthermore, the extended conjugation length of X2 makes it possible to draw parallels to the behavior of analogous polymeric compounds, while achieving a level of structural uniformity and purity that resembles those of small molecules. The melting temperature of X2 is comparatively high (269 °C), [27,28] which makes it possible to study charge carrier transport under conditions of thermal and electrical stress, and its organizational preferences lead to a predominantly edge-on orientation, [29] which is well suited to OFET applications.…”

“…More recent investigations with pentacene- [17] and perylenediimide-based [18] devices have focused more on device stability. [19][20][21][22][23][24][25][26] Furthermore, the extended conjugation length of X2 makes it possible to draw parallels to the behavior of analogous polymeric compounds, while achieving a level of structural uniformity and purity that resembles those of small molecules. The general molecular formula is similar to poly[2,6-(4,4-bis-(2ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]dithiophene)-alt-4,7(2,1,3benzothiadiazole)] (PCPDTBT) and poly [4-(4,4-dihexadecyl-4H-cyclopenta[1,2-b;5,4-b′]dithiophen-2-yl)-alt-thiadiazolo [3,4-c] pyridine] (PCDTPT) conjugated polymers, which have recently garnered significant attention due to their high performance.…”