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Palai, A.K.,Cho, H.,Cho, S.,Shin, T.J.,Jang, S.,Park, S.U.,Pyo, S. Elsevier Science 2013 Organic electronics Vol.14 No.5
We report the synthesis, characterization and behavior in field-effect transistors of non-functionalized soluble diketopyrrolopyrrole (DPP) core with only a solubilizing alkyl chain (i.e. -C<SUB>16</SUB>H<SUB>33</SUB> or -C<SUB>18</SUB>H<SUB>37</SUB>) as the simplest p-channel semiconductor. The characteristics were evaluated by UV-vis and fluorescence spectroscopy, X-ray diffraction, cyclic voltammetry (CV), thermal analysis, atomic force microscopy (AFM) and density functional theory (DFT) calculation. For top-contact field-effect transistors, two types of active layers were prepared either by a solution process (as a 1D-microwire) or thermal vacuum deposition (as a thin-film) on a cross-linked poly(4-vinylphenol) gate dielectric. All the devices showed typical p-channel behavior with dominant hole transports. The device made with 1D-microwiress of DPP-R18 showed field-effect mobility in the saturation region of 1.42x10<SUP>-2</SUP>cm<SUP>2</SUP>/Vs with I<SUB>ON</SUB>/I<SUB>OFF</SUB> of 1.82x10<SUP>3</SUP>. These findings suggest that the non-functionalized soluble DPP core itself without any further functionalization could also be used as a p-channel semiconductor for low-cost organic electronic devices.
Palai, Akshaya K.,Lee, Jihee,Shin, Tae Joo,Kumar, Amit,Park, Seung-Un,Pyo, Seungmoon The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.64
<P>Preparation and structural analysis of highly ordered single crystalline wires of a diketopyrrolopyrrole (DPP) molecular semiconductor grown through a solution process are reported, and the static/dynamic electrical response of an organic electronic device using the DPP semiconductor has been analyzed.</P> <P>Graphic Abstract</P><P>Preparation and structural analysis of highly ordered single crystalline wires of a diketopyrrolopyrrole (DPP) molecular semiconductor grown through a solution process are reported, and the static/dynamic electrical response of an organic electronic device using the DPP semiconductor has been analyzed. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc02055c'> </P>