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. 2017 Mar 13;7(1):164.
doi: 10.1038/s41598-017-00277-7.

High Performance Solution Processed Organic Field Effect Transistors with Novel Diketopyrrolopyrrole-Containing Small Molecules

Bogyu Lim  1 , Huabin Sun  2 , Jaechol Lee  1 , Yong-Young Noh  3
Affiliations

High Performance Solution Processed Organic Field Effect Transistors with Novel Diketopyrrolopyrrole-Containing Small Molecules

Bogyu Lim et al. Sci Rep. .

Abstract

The donor-acceptor (D-A)-type diketopyrrolopyrrole (DPP)-based small molecules (LGC-D117 and LGC-D118) were synthesized and used as the active layer of solution-processable organic field-effect transistors (OFETs). Both LGC-D117 and LGC-D118 contain silaindacenodithiophene as electron-donor units with DPP as an electron-accepting linker, and octylrhodanine as the electron-accepting end group. The molecules were functionalized with different side chains to study their effects on OFET characteristics. LGC-D117 has a simple branched alkyl side chain, whereas LGC-D118 features a bulky siloxane-terminated hybrid alkyl chain. The siloxane side chains of LGC-D118 account for its better crystallinity, leading to significantly high field-effect mobility (max 3.04 cm2 V-1 s-1). In particular, LGC-D118 is well soluble and sustains the high mobility in the environmentally friendly 2-methyltetrahydrofuran solvent with low temperature annealing at 100 °C due to the bulky siloxane-terminated alkyl side chain.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Figure 1
Figure 1
Molecular structures of LGC-D117 and LGC-D118.
Figure 2
Figure 2
UV-vis absorption spectra of (a) LGC-D117, (b) LGC-D118 solutions and films.
Figure 3
Figure 3
Typical transfer and output curves of organic field-effect transistors based on LGC-D117 and LGC-D118 OSCs after annealing at 100 °C. (Vsd = −40 V).
Figure 4
Figure 4
Atomic force microscopy imaging of the as-spun organic films for (a) LGC-D117, (b) LGC-D118 and of films annealed at 140 °C for (c) LGC-D117, (d) LGC-D118.
Figure 5
Figure 5
Grazing incidence X-ray diffraction patterns of the as-spun and thermally annealed (140 °C) LGC-D117 [(a) and (c)], LGC-D118 [(b) and (d)].
See this image and copyright information in PMC

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