Molecular Weight-Induced Structural Transition of Liquid-Crystalline Polymer Semiconductor for High-Stability Organic Transistor
- Authors
- Kim, DH; Lee, J; Park, JI; Chung, JW; Lee, WH; Giri, G; Yoo, B; Koo, B; Kim, JY; Jin, YW; Cho, K; Lee, BL; Lee, S
- Issue Date
- Dec-2011
- Publisher
- WILEY-V C H VERLAG GMBH
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.21, pp.4442 - 4447
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 21
- Start Page
- 4442
- End Page
- 4447
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/6002
- DOI
- 10.1002/adfm.201101021
- ISSN
- 1616-301X
- Abstract
- 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.
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Collections - College of Engineering > Department of Organic Materials and Fiber Engineering > 1. Journal Articles
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