Further Examination of Interconnection in Conjugated Polymers for Organic Field-Effect Transistors
Journal
Advanced Electronic Materials
Journal Volume
5
Journal Issue
8
Pages
-
Date Issued
2019
Author(s)
Abstract
Conventional design principles toward conjugated polymers aiming at high organic field-effect-transistor (OFET) mobilities are directed at the establishment of extensive edge-on π-order. However, emerging principles state that efficient charge transport can be established through interconnected short-range-order polymer crystallites. Fractional side-chain truncation has been employed to furnish numerous polymers. The electronic structures of the polymers are insensitive to side-chain variation, whereas the thermal and morphological properties respond to it significantly. As the butyl side chain in the polymer backbone increases in size, the π-order of the corresponding polymer thin film decreases gradually, while the π-interconnection is enhanced. Moreover, the π-anisotropy is transformed from face-on to isotropy, which can be rationalized by the geometric shape of polymer crystallite. The OFET results disclose the beneficial effect of π-interconnection to enhance the electron mobility. The significant role of π-interconnection in the transport is further emphasized. An electron mobility of 0.31 cm2 V−1 s−1 is accomplished, strongly suggesting that the modulation of π-interconnection by fractional side-chain truncation can serve as a straightforward approach to improving OFET electron mobility.
SDGs
Type
journal article