Abstract

Liquid crystalline (LC) organic semiconductorshaving long‐range‐ordered LC phases hold great application potential in organicfield‐effect transistors (OFETs). However, to meet real device applicationrequirements, it is a prerequisite to precisely pattern the LC film at desiredpositions. Here, a facile method that combines the technique of inkjet printingand melt processing to fabricate patterned LC film for achievinghigh‐performance organic integrated circuits is demonstrated. Inkjet printingcontrols the deposition locations of the LC materials, while the meltprocessing implements phase transition of the LC materials to form high‐qualityLC films with large grain sizes. This approach enables to achieve patternedgrowth of high‐quality 2,7‐dioctyl[1]‐benzothieno[3,2‐b][1]benzothiophene(C8‐BTBT) LC films. The patterned C8‐BTBT LC film‐based 7 × 7 OFET array has100% die yield and shows high average mobility of 6.31 cm² V⁻¹ s⁻¹, along with maximum mobility up to 9.33 cm² V⁻¹ s⁻¹. As a result, the inverters based on the patterned LC filmsreach a high gain up to 23.75 as well as an ultrahigh noise margin over 81.3%.Given the good generality of the patterning process and the high quality of theresulting films, the proposed method paves the way for high‐performance organicintegrated devices.

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