Near-IR Absorbing Molecular Semiconductors Incorporating Cyanated Benzothiadiazole Acceptors for High-Performance Semitransparent n-Type Organic Field-Effect Transistors
Nugraha, Mohamad Insan
Eisner, Flurin D.
Anthopoulos, Thomas D.
KAUST DepartmentPhysical Science and Engineering (PSE) Division
KAUST Solar Center (KSC)
Material Science and Engineering Program
Embargo End Date2022-12-17
Permanent link to this recordhttp://hdl.handle.net/10754/675005
MetadataShow full item record
AbstractSmall band gap molecular semiconductors are of interest for the development of transparent electronics. Here we report two near-infrared (NIR), n-type small molecule semiconductors, based upon an acceptor-donor-acceptor (A-D-A) approach. We show that the inclusion of molecular spacers between the strong-electron-accepting end group, 2,1,3-benzothiadiazole-4,5,6-tricarbonitrile, and the donor core affords semiconductors with very low band gaps down to 1 eV. Both materials were synthesized by a one-pot, 6-fold nucleophilic displacement of a fluorinated precursor by cyanide. Significant differences in solid-state ordering and charge carrier mobility are observed depending on the nature of the spacer, with a thiophene spacer resulting in solution processed organic field-effect transistors (OFETs) exhibiting excellent electron mobility up to 1.1 cm2 V-1 s-1. The use of silver nanowires as the gate electrode enables the fabrication of a semitransparent OFET device with an average visible transmission of 71% in the optical spectrum.
CitationKafourou, P., Nugraha, M. I., Nikitaras, A., Tan, L., Firdaus, Y., Aniés, F., … Heeney, M. (2021). Near-IR Absorbing Molecular Semiconductors Incorporating Cyanated Benzothiadiazole Acceptors for High-Performance Semitransparent n-Type Organic Field-Effect Transistors. ACS Materials Letters, 165–174. doi:10.1021/acsmaterialslett.1c00635
SponsorsThe authors thank the Engineering and Physical Sciences Research Council (EPSRC) (EP/L016702/1 and EP/T028513/1), Global Research Laboratory Program of the National Research Foundation (NRF-2017K1A1A2013153), the Royal Society, and the Wolfson Foundation (Royal Society Wolfson Fellowship) for funding. M.I.N., M.H., and T.D.A. acknowledge funding from the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award Nos. OSR-2018-CARF/CCF-3079 and OSR-2020-CRG8-4095. F.E. thanks EPSRC for support via a Doctoral Prize Fellowship.
PublisherAmerican Chemical Society (ACS)
JournalACS Materials Letters