Direct Writing of Aligned Conjugated Polymer Micro-Ribbons for High-Performance Organic Electronics

Organic semiconductors (OSCs) and relevant devices have presented their great potential in flexible and wearable electronics. Controlled solution deposition of organic semiconductors at a limited local region is highly expected because it can realize feasible and low-cost fabrication of highly integrated devices with low current leakage and free crosstalk between adjacent devices. Here, we reported a feasible microscale meniscus-guided direct writing method to purposely deposit conjugated polymer poly[2,5-(2-octyldodecyl)-3,6-diketopyrrolopyrrole-alt-5,5-(2,5-di(thien-2-yl)thieno[3,2-b]thiophene)] micro-ribbons at preset local regions. The direct writing of OSCs was carried out on a microscale with the width of written micro-ribbons down to 5 μm, which was seldomly reported before. Direct writing operation induced anisotropic crystallization of organic semiconducting micro-ribbons, which further enhanced the electrical performance of organic transistors with a device on/off ratio of 5.1 × 104 and carrier mobility of 1.05 cm2 V–1 s–1. Small-angle X-ray diffraction analysis further proved the existence of anisotropic crystallization behavior. This technique shed light on the feasible and convenient fabrication of future high-performance organic electronics.