Solution‐Processable Balanced Ambipolar Field‐Effect Transistors Based on Carbonyl‐Regulated Copolymers

Abstract

It is very important to develop ambipolar field effect transistors to construct complementary circuits. To obtain balanced hole- and electron-transport properties, one of the key issues is to regulate the energy levels of the frontier orbitals of the semiconductor materials by structural tailoring, so that they match well with the electrode Fermi levels. Five conjugated copolymers were synthesized and exhibited low LUMO energy levels and narrow bandgaps on account of the strong electron-withdrawing effect of the carbonyl groups. Polymer thin film transistors were prepared by using a solution method and exhibited high and balanced hole and electron mobility of up to 0.46 cm V s , which suggested that these copolymers are promising ambipolar semiconductor materials.

Multisubstituted Azaisoindigo-Based Polymers for High-Mobility Ambipolar Thin-Film Transistors and Inverters

“…High-mobility polymer semiconductors are emerging electronic materials for use in flexible display backplanes and digital logic that enable mainstream technologies. − Developing new semiconducting polymers has attracted increasing attention. The ability to control electronic structures by combination of different conjugation moieties leads to a plethora of such materials. − However, one of the major obstacles to fully realize their potentials is the uneven development in which performances of n-type materials cannot rival those of p-type counterparts. The need for balanced hole- and electron-transport is becoming an imperative to construct the complementary-like logic circuit.…”

An A‐D‐A′‐D‐A Conjugated Molecule Entailing Diazapentalene Unit for an n‐Type Organic Semiconductor

“…The past decades have witnessed the significant progresses of organic and polymeric semiconductors. [1][2][3][4][5] Various conjugated frameworks, such as diketopyrrolopyrrole (DPP), [6][7][8][9][10][11][12][13][14][15] naphthodithiophenediimide (NDTI), [16][17][18][19][20][21][22][23] benzodifurandione-based oligo(p-phenylene vinylene) (BDOPV) [24] and isoindigo, [25][26][27][28] have been explored to construct the conjugated molecules and polymers for semiconductors of high charge mobilities. For instance, the electron deficiency,p lanar conjugated structure and easyf unctionalizatione nableD PP as av ersatile building block for organic and polymerics emiconductors.…”