title: Synthesis and characterization of novel p-type alkyl bithiophene end-capped anthracene and naphthalene derivatives for organic thin-film transistors.
abstract: New semiconductors having naphthalene and anthracene cores with hexylated bithiophene side units, 2,6-bis(5'-hexylbithiophen-2'-yl)naphthalene (HBT-NA) and 2,6-bis(5'-hexylbithiophen-2'-yl)anthracene (HBT-AN), were synthesized. HBT-AN and HBT-NA were characterized using FT-IR, 1H-NMR, Mass spectrum and elemental analysis. HBT-AN and HBT-NA showed well ordered crystalline with high thermal stabilities as evidenced by 5% weight loss at 447 degrees C for HBT-AN and 434 degrees C for HBT-NA. The closed packed structures between adjacent molecules were observed by studying UV-visible and photoluminescence (PL) in solution and film. The HOMO energy levels of HBT-NA and HBT-AN were found to be 5.47 eV and 5.42 eV, respectively. HBT-NA exhibits hole mobility of 8.4 x 10(-2) cm2Ns and on/off ratio of 5.6 x 10(5). HBT-AN shows 5.2 x 10(-2) cm2Ns and on/off ratio of 1.0 x 10(5).
authors.affiliation: School of Materials Science and Engineering and Engineering Research Institute (ERI), Gyeongsang National University, Jinju, 660-701, Republic of Korea.
authors.forename: Hye Jin
authors.initials: HJ
authors.lastname: Koh
authors.forename: Sang Hun
authors.initials: SH
authors.lastname: Jang
authors.forename: Chul Young
authors.initials: CY
authors.lastname: Kim
authors.forename: Sung Chul
authors.initials: SC
authors.lastname: Shin
authors.forename: Yun-Hi
authors.initials: YH
authors.lastname: Kim
authors.forename: Soon-Ki
authors.initials: SK
authors.lastname: Kwon