@article{a7e54db5b8a44b4483ab0120b540c6b7,
title = "Synthesis and physical properties of brominated hexacene and hole-transfer properties of thin-film transistors",
abstract = "A halide-substituted higher acene, 2-bromohexacene, and its precursor with a carbonyl bridge moiety were synthesized. The precursor was synthesized through 7 steps in a total yield of 2.5%. The structure of precursor and thermally converted 2-bromohexacene were characterized by solid state NMR, IR, and absorption spectra, as well as by DFT computation analysis. It exhibited high stability in the solid state over 3 months, therefore can be utilized in the fabrication of opto-electronic devices. The organic thin-film transistors (OFETs) were fabricated by using 2-bromohexacene and parent hexacene through vaccum deposition method. The best film mobility of 2-bromohexacene was observed at 0.83 cm2 V-1 s-1 with an on/off ratio of 5.0 × 104 and a threshold of -52 V, while the best film mobility of hexacene was observed at 0.076 cm2 V-1 s-1 with an on/off ratio of 2.4 × 102 and a threshold of -21 V. AFM measurement of 2-bromohexacene showed smooth film formation. The averaged mobility of 2-bromohexacene is 8 fold higher than the non-substituted hexacene.",
author = "Motonori Watanabe and Takaaki Miyazaki and Toshinori Matsushima and Junko Matsuda and Chein, {Ching Ting} and Masahiko Shibahara and Chihaya Adachi and Sun, {Shih Sheng} and Chow, {Tahsin J.} and Tatsumi Ishihara",
note = "Funding Information: This work was supported by a Grant-in-Aid for Science Research (JP17H04888, JP17K19123) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, and was performed under the Cooperative Research Program of “Network Joint Research Centre for Materials and Devices (IMCE, Kyushu University)”. The computation was mainly carried out using the computer facilities at Research Institute for Information Technology, Kyushu University. MW and TM acknowledge support from I2CNER, funded by the World Premier International Research Centre Initiative (WPI), Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT), Japan. TJC and SSS are also grateful for the supports from the Ministry of Science and Technology of Taiwan and Academia Sinica. Publisher Copyright: {\textcopyright} 2018 The Royal Society of Chemistry.",
year = "2018",
doi = "10.1039/c7ra13632c",
language = "English",
volume = "8",
pages = "13259--13265",
journal = "RSC Advances",
issn = "2046-2069",
publisher = "Royal Society of Chemistry",
number = "24",
}