Control of droplet morphology for inkjet-printed TIPS-pentacene transistors

摘要

School of Engineering and Computing Sciences and Centre for Molecular and Nanoscale Electronics, Durham University, Durham DH1 3LE, UK,Department of Electronics Engineering, Dong-A University, 840, Hadan-dong, Saha-gu, Busan 604-714, Republic of Korea;rnDepartment of Electronics Engineering, Dong-A University, 840, Hadan-dong, Saha-gu, Busan 604-714, Republic of Korea;rnPrintable Electronics Technology Centre (PETEC), Sedgefield, Co Durham TS21 3FC, UK;rnSchool of Engineering and Computing Sciences and Centre for Molecular and Nanoscale Electronics, Durham University, Durham DH1 3LE, UK;rnSchool of Engineering and Computing Sciences and Centre for Molecular and Nanoscale Electronics, Durham University, Durham DH1 3LE, UK;rnDepartment of Electronics Engineering, Dong-A University, 840, Hadan-dong, Saha-gu, Busan 604-714, Republic of Korea;%We report on methods to control the morphology of droplets of 6,13-bis(triisopropyl-silylethynyl) penta-cene (TIPS-PEN), which are then used in the fabrication of organic thin film transistors (OTFTs). The grain size and distribution of the TIPS-PEN were found to depend on the temperature of the droplets during drying. The performance of the OTFTs could be improved by heating the substrate and also by changing the relative positions of the inkjet-printed droplets. In our experiments, the optimum substrate temperature was 46 ℃ in air. Transistors with the TIPS-PEN grain boundaries parallel to the current flow between the source and drain electrodes exhibited charge carrier mobilities of 0.44 + 0.08 cm~2/V s.