%0 Journal Article
%T Organic n-Channel Transistors Based on [1]Benzothieno[3,2-b]benzothiophene每Rylene Diimide Donor每Acceptor Conjugated Polymers
%J -
%D 2018
%R https://doi.org/10.1021/acsami.8b10831
%X Improving the charge-carrier mobility of conjugated polymers is important for developing high-performance, solution-processed optoelectronic devices. Although [1]benzothieno[3,2-b]benzothiophene (BTBT) has been frequently used as a high-performance p-type small molecular semiconductor and employed a few times as a building block for p-type conjugated polymers, it has never been explored as a donor moiety for high-performance n-type conjugated polymers. Here, BTBT has been conjugated with either n-type perylene diimide (PDI) or naphthalene diimide (NDI) units to generate a donor每acceptor copolymer backbone, for the first time. Charge-transport measurements of organic field-effect transistors show n-type dominant behaviors, with the electron mobility reaching ‵0.11 cm2 V每1 s每1 for PDI每BTBT and ‵0.050 cm2 V每1 s每1 for NDI每BTBT. The PDI每BTBT mobility value is one of the highest among the PDI-containing polymers. The high 羽每羽 stacking propensity of BTBT significantly improves the charge-carrier mobility in these polymers, as supported by atomic force microscopy and grazing incidence X-ray diffraction analyses. Phototransistor applications of these polymers in the n-type mode show highly sensitive photoresponses. Our findings demonstrate that incorporation of the BTBT donor unit within the rylene diimide acceptor-based conjugated polymers can improve the molecular ordering and electron mobility
%U https://pubs.acs.org/doi/10.1021/acsami.8b10831