Controlling Ambipolar Charge Transport in Isoindigo-Based Conjugated Polymers by Altering Fluorine Substitution Position for High-Performance Organic Field-Effect Transistors
SCIE
SCOPUS
- Title
- Controlling Ambipolar Charge Transport in Isoindigo-Based Conjugated Polymers by Altering Fluorine Substitution Position for High-Performance Organic Field-Effect Transistors
- Authors
- Kim, Minjun; Park, Won-Tae; Park, Sang Ah; Park, Cheol Woong; Ryu, Seung Un; Lee, DaeHwan; Noh, Yong-Young; PARK, TAI HO
- Date Issued
- 2019-03-07
- Publisher
- WILEY-V C H VERLAG GMBH
- Abstract
- A molecular design strategy to achieve highly balanced ambipolar charge transport for donor-acceptor (D-A) isoindigo (IIG)-based copolymer through systematic selection of fluorination positions is reported. To study fluorine substitution site effects on electronic and structural properties, two fluorinated IIG-based copolymers (PIIG-iFT2 and PIIG-oFT2) are synthesized, which contain two fluorine atoms at the bithiophene (T2) inner and outer site and compare them with a nonfluorinated copolymer of IIG and T2 (PIIG-T2) as the reference polymer. Fluorination at the outer site of T2 in PIIG-oFT2 polymer effectively lowers molecular energy levels and increases molecular planarity more than fluorination at the T2 inner site. PIIG-oFT2 organic field-effect transistors show highly balanced ambipolar mobility, hole mobility (mu(h))/electron mobility (mu(e)) = 1 by increasing electron mobility, whereas PIIG-T2 (mu(h)/mu(e) = 9.0) and PIIG-iFT2 (mu(h)/mu(e) = 2.4) exhibit unbalanced ambipolar transport. The ambipolar complementary-like inverter is also demonstrated by simple one-time coating of PIIG-oFT2 with gain = 21.
- Keywords
- THIN-FILM TRANSISTORS; DERIVATIVES; SEMICONDUCTORS; CONFORMATION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/95260
- DOI
- 10.1002/adfm.201805994
- ISSN
- 1616-301X
- Article Type
- Article
- Citation
- ADVANCED FUNCTIONAL MATERIALS, vol. 29, no. 10, 2019-03-07
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- There are no files associated with this item.
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