Cross-Linking of Poly(arylenebutadiynylene)s and Its Effect on Charge Carrier Mobilities in Thin-Film Transistors

Photolithographic Patterning of Organic Semiconductors for Organic Field-Effect Transistors

Over the past 25 years, three major photolithography strategies have been employed for patterning organic semiconductors in organic field-effect transistors (OFETs): modified photolithography (MPL), orthogonal photolithography (OPL), and direct photolithography (DPL). This Review examines key studies to highlight the strengths and weaknesses of each strategy. Two DPL methods, in particular, show great promise: organic azide/diazirine cross-linkers (Z-cross-linkers) and UV-cross-linkable organic semiconducting blends (X-blends). These methods not only simplify the photolithography process significantly but also enhance the chemical and physical resistance of patterned organic semiconductors against photolithographic chemicals and tandem solution-depositions. Consequently, these advancements enable the fabrication of organic integrated circuits entirely through solution processes. In conclusion, photolithography of organic semiconductors serves a dual purpose: it facilitates the patterning of active layers for OFETs and acts as an enabling technology for fabricating sophisticated and cost-effective organic integrated circuits.

Photo-crosslinkable organic materials for flexible and stretchable electronics

As technology advances to enhance human perceptual experiences of the surrounding environment, significant research on stretchable electronics is actively progressing, spanning from the synthesis of materials to their applications in fully integrated devices. A critical challenge lies in developing materials that can maintain their electrical properties under substantial stretching. Photo-crosslinkable organic materials have emerged as a promising solution due to their ability to be precisely modified with light to achieve desired properties, such as enhanced durability, stable conductivity, and micropatterning. This review examines recent research on photo-crosslinkable organic materials, focusing on their components and integration within stretchable electronic devices. We explore the essential characteristics required for each device component (insulators, semiconductors, and conductors) and explain how photo-crosslinking technology addresses these needs through its principles and implementation. Additionally, we discuss the integration and utilization of these components in real-world applications, including physical sensors, organic field-effect transistors (OFETs), and organic solar cells (OSCs). Finally, we offer a concise perspective on the future directions and potential challenges in ongoing research on photo-crosslinkable organic materials.