Regulate the Electron Mobility and Threshold Voltage of P(NDI2OD‐T2)‐Based Organic Field‐Effect Transistors by the Compatibility Principle

Abstract

Blending has been used extensively to meet the requirements for high‐mobility organic field‐effect transistors (OFETs), involving various combinations of (non‐)conjugated polymers and (non‐)conjugated molecules. Nonetheless, the collaborative effects of conjugated polymer and its structurally analogous molecule on charge‐transport properties have rarely been reported. In this work, P(NDI2OD‐T2) and N,N′‐bisbutyl‐2,6‐bis([2,2′]bithiophenyl‐5‐yl)‐1,4,5,8‐naphthalene diimide (M), are synthesized and blended with each other. M is designed to resemble the monomeric unit of P(NDI2OD‐T2) on the basis of the premise that structural similarity would promote their compatibility in the blends. This compatibility preserves electronic coupling through intermolecular interaction and establishes charge‐transport pathways as well. Overall, the thin‐film morphology of the blends could be prudently regulated through controlling the blending fraction, resulting in raising electron mobility up to ≈0.3 cm2 V−1 s−1. More importantly, this approach reduces threshold voltage by 50%, originating from lowering the injection barrier. These findings are well rationalized and the promising capabilities of the compatibility principle in OFETs are strongly supported.

External electric field treatment for improving the morphology and electrical performance of P(NDI2OD-T2)

“…The average electron mobility value increased from 1.69 (0 kV cm −1 ) to 2.14 cm 2 V −1 s −1 (0.75 kV cm −1 ), and the 0.75 kV cm −1 sample demonstrated excellent electron mobility performance of up to 3.33 cm 2 V −1 s −1 (Table S2 †). This electron mobility reaches almost the highest level of P(NDI2OD-T2) reported so far [59][60][61][62][63][64][65][66][67][68][69][70][71] (Table S3 †). Furthermore, the electrical performance stability of the 0.75 kV per cm OFET, which showed signicant improvement due to EEF treatment, is nearly similar to, or even better than, that of the 0 kV per cm OFET, which did not undergo EEF treatment (Fig.…”

Further investigation of conjugated length and dispersity on light‐driven hydrogen evolution facilitated by conjugated polymers

“…Similar observations can be found in other studies as well. [26][27][28][29] DRS revealed that the E g was not sensitive to the incorporation of the 1,4-butanediylbis(oxy) units in the polymer chain. In principle, the incorporation should interrupt the intramolecular conjugation length, diminishing the intramolecular exciton delocalization length.…”

Integrating Conjugated Polymers with Bacteriorhodopsin to Realize Quasi Dual‐Gate Organic Field‐Effect Transistors

“…PDPP4T and PNDI2T were synthesized according to procedures reported in the literature. [32][33][34][35][36] P3HT and PffBT4T were acquired from other sources. Optical and electronic properties of the polymers are summarized in Table 1 and the corresponding spectra are included in the Supporting Information.…”