Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 38, Pages 32444-32453Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b10831
Keywords
conjugated polymers; BTBT; OFETs; phototransistors; charge transport
Funding
- National Research Foundation of Korea (NRF) [2017R1E1A1A01074090]
- Nano Material Technology Development Program [2017M3A7B8063825]
- Center for Advanced Soft Electronics under the Global Frontier Research Program through the NRF by the Ministry of Science and ICT (MSIT), Korea [2013M3A6A5073175]
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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-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 similar to 0.11 cm(2) V-1 s(-1) for PDI-BTBT and similar to 0.050 cm(2) V-1 s(-1) for NDI-BTBT. The PDI-BTBT mobility value is one of the highest among the PDI-containing polymers. The high pi-pi 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.
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