Molecular Weight-Induced Structural Transition of Liquid-Crystalline Polymer Semiconductor for High-Stability Organic Transistor

被引：22

作者：

Kim, Do Hwan ^{[1
]}

Lee, Jiyoul ^{[1
]}

Park, Jeong-Il ^{[1
]}

Chung, Jong Won ^{[1
]}

Lee, Wi Hyoung ^{[2
]}

Giri, Gaurav ^{[3
]}

Yoo, Byungwook ^{[1
]}

Koo, Bonwon ^{[1
]}

Kim, Joo Young ^{[1
]}

Jin, Yong Wan ^{[1
]}

Cho, Kilwon ^{[2
]}

Lee, Bang-Lin ^{[1
]}

Lee, Sangyoon ^{[1
]}

机构：

[1] Samsung Adv Inst Technol, Display Device Lab, Yongin 446712, South Korea

[2] Pohang Univ Sci & Technol, Dept Chem Engn, Pohang 790784, South Korea

[3] Stanford Univ, Dept Chem Engn, Stanford, CA 94305 USA

来源：

ADVANCED FUNCTIONAL MATERIALS | 2011年 / 21卷 / 23期

关键词：

FIELD-EFFECT MOBILITY; THIN-FILM TRANSISTORS; CHARGE-TRANSPORT; REGIOREGULAR POLY(3-HEXYLTHIOPHENE); POLYTHIOPHENE; COPOLYMERS; MORPHOLOGY;

D O I：

10.1002/adfm.201101021

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In order to fabricate polymer field-effect transistors (PFETs) with high electrical stability under bias-stress, it is crucial to minimize the density of charge trapping sites caused by the disordered regions. Here we report PFETs with excellent electrical stability comparable to that of single-crystalline organic semiconductors by specifically controlling the molecular weight (MW) of the donor-acceptor type copolymer semiconductors, poly (didodecylquaterthiophene-alt-didodecylbithiazole). We found that MW-induced thermally structural transition from liquid-crystalline to semi-crystalline phases strongly affects the device performance (charge-carrier mobility and electrical bias-stability) as well as the nanostructures such as the molecular ordering and the morphological feature. In particular, for the polymer with a MW of 22 kDa, the transfer curves varied little (Delta V-th = 3 similar to 4 V) during a period of prolonged bias stress (about 50 000 s) under ambient conditions. This enhancement of the electrical bias-stability can be attributed to highly ordered liquid-crystalline nanostructure of copolymer semiconductors on dielectric surface via the optimization of molecular weights.

引用

页码：4442 / 4447

页数：6

共 36 条

[1] Soluble and processable regioregular poly(3-hexylthiophene) for thin film field-effect transistor applications with high mobility [J].