Control of the Morphology and Structural Development of Solution‐Processed Functionalized Acenes for High‐Performance Organic Transistors

Abstract

Solution‐processable functionalized acenes have received special attention as promising organic semiconductors in recent years because of their superior intermolecular interactions and solution‐processability, and provide useful benchmarks for organic field‐effect transistors (OFETs). Charge‐carrier transport in organic semiconductor thin films is governed by their morphologies and molecular orientation, so self‐assembly of these functionalized acenes during solution processing is an important challenge. This article discusses the charge‐carrier transport characteristics of solution‐processed functionalized acene transistors and, in particular, focuses on the fine control of the films' morphologies and structural evolution during film‐deposition processes such as inkjet printing and post‐deposition annealing. We discuss strategies for controlling morphologies and crystalline microstructure of soluble acenes with a view to fabricating high‐performance OFETs.

Organic Semiconductor/Insulator Polymer Blends for High-Performance Organic Transistors

“…This, in turn, enhanced the electrical properties of the OFETs because the phase-separated interface served as a pathway for charge transport (Figure 2b), and the smooth interface is beneficial for facilitating efficient charge transport. Soluble acenes are advantageous organic semiconductors because materials with solution processability and high π-orbital overlaps have been reported [31][32][33]. Where this type of organic semiconductor is used, processing conditions should be optimized to obtain desirable thin film morphologies and microstructures, thereby maximizing the electrical properties of OFETs.…”

Stereoselectivity and electrostatics in charge-transfer Mn- and Cs-TCNQ4 networks on Ag(100)

“…elf-assembly provides a very promising bottom-up fabrication strategy that has been employed in many different fields like organic electronics, crystal engineering and design of hybrid nanocomposite materials [1][2][3][4][5] . This idea takes inspiration from nature itself: perhaps the most comprehensive and impressive display of the self-assembly potential for both reproducibility and scalability is found in biological systems, where long-range van der Waals and electrostatic interactions typically drive very complex stereoselective assembly processes.…”

Synthesis and characterization of copper, polyimide and TIPS-pentacene layers for the development of a solution processed fibrous transistor

“…Using a mixture of 25vol% dodecane and 75vol% toluene lead to larger crystals due to Marangoni flow. 10 A homogeneous and crystalline film was obtained from 2w% toluene and 1w% tetralin solution although they both exhibited a ring like behaviour on the periphery known as the "coffee stain" effect. TIPS-pentacene was first deposited using dipcoating.…”

“…13 Because of its versatile solution processability and high charge carrier mobility, 6,13-bis(Triisopropylsilylethynyl)pentacene (TIPS-pentacene) has been the most intensively investigated compound of all examined soluble small organic semiconductors. 10,14,15 Due to its molecular structure, as illustrated in Figure 2, TIPS-pentacene molecules will form cofacial 2D π -stacked structure with a π -face separation of 3.43 Å and π -overlap of 7.73Å 2 . 13,16 This structure leads to relatively high field effect mobilities, generally in the order of 10 -1 cm 2 /V.s with the highest reported field effect mobility for TIPS-pentacene drop casted from a 2w% toluene solution of 1.8 cm 2 /V.s.…”