- Inversion of dominant polarity in ambipolar polydiketopyrrolopyrrole with thermally removable groups
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A narrow bandgap polymeric semiconductor, BOC-PTDPP, comprising alkyl substituted diketopyrrolopyrrole (DPP) and tert-butoxycarbonyl (t-BOC)-protected DPP, is synthesized and used in organic field-effect transistors (OFETs). The polymer films are prepared by solution deposition and thermal annealing of precursors featuring thermally labile t-BOC groups. The effects of the thermal cleavage on the molecular packing structure in the polymer thin films are investigated using thermogravimetric analysis (TGA), UV-vis spectroscopy, atomic force microscopy (AFM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray diffraction (XRD) analysis. Upon utilization of solution-shearing process, integrating the ambipolar BOC-PTDPP into transistors shows p-channel dominant characteristics, resulting in hole and electron mobilities as high as 1.32 × 10-2 cm2 V-1 s-1 and 2.63 × 10-3 cm2 V-1 s-1, which are about one order of magnitude higher than those of the drop-cast films. Very intriguingly, the dominant polarity of charge carriers changes from positive to negative after the thermal cleavage of t-BOC groups at 200 °C. The solution-sheared films upon subsequent thermal treatment show superior electron mobility (μe = 4.60 × 10-2 cm2 V -1 s-1), while the hole mobility decreases by one order of magnitude (μh = 4.30 × 10-3 cm2 V-1 s-1). The inverter constructed with the combination of two identical ambipolar OFETs exhibits a gain of ~10. Reported here for the first time is a viable approach to selectively tune dominant polarity of charge carriers in solution-processed ambipolar OFETs, which highlights the electronically tunable ambipolarity of thermocleavable polymer by simple thermal treatment. A narrow bandgap polymeric semiconductor, BOC-PTDPP, comprising alkyl substituted diketopyrrolopyrrole (DPP) and tert-butoxycarbonyl (t-BOC)-protected DPP, is synthesized and used in organic field-effect transistors (OFETs). The dominant polarity of charge carriers changes from positive to negative after the thermal cleavage of t-BOC groups at 200 °C. Copyright
- Lee, Junghoon,Han, A-Reum,Hong, Jayeon,Seo, Jung Hwa,Oh, Joon Hak,Yang, Changduk
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- A Diketopyrrolopyrrole-Based Dimer as a Blue Pigment
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1,4-Diketopyrrolo[3,4-c]pyrroles (DPPs) constitute a class of hydrogen-bonded pigments covering a color range from yellow–orange to dark violet. We report facile dimerization of a Boc-substituted 3,6-dithienyl-DPP. The formed dimer shows brilliantly blue color as a result of the expansion of the chromophore. The soluble dimer acts as latent pigment and is converted to the corresponding pigment either via thermocleavage or acidic deprotection of the Boc groups. The synthesized pigment is characterized by high migrational stability in a polymer matrix and a clear blue color.
- Casutt, Manuela,Dittmar, Benedikt,Makowska, Hanna,Marszalek, Tomasz,Kushida, Soh,Bunz, Uwe H. F.,Freudenberg, Jan,J?nsch, Daniel,Müllen, Klaus
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- Molecular design directs self-assembly of DPP polycatenars into 2D and 3D complex nanostructures
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Novel diketopyrrolopyrrole (DPP) based polycatenars characterized with a long π-conjugated rigid calamitic core, different side groups (t-Boc, H or PEO) at the lactam N atoms of the central DPP core and terminal hydrophobic paraffinic chains were prepared
- Chang, Qing,Cheng, Xiaohong,Du, Xuyang,Ge, Tao,Liu, Xinhao,Ma, Tao
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- The solution, an organic semiconductor material, the organic semiconductor film, electronic devices and electronic equipment
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A solution includes an organic solvent and a compound dissolved in the organic solvent, having the following formula (1): wherein R1 represents an aromatic group which may have a substituent or an alkyl group which may have a substituent; R2 and R3 independently represent an alkyl group which may have a substituent, an alkoxy group which may have a substituent, an alkylthio group which may have a substituent or a hydrogen atom, and may form a ring together; X represents an alkyl group having 4 to 6 carbon atoms, which may have a substituent; and n represents 1, 2 or 3.
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- ORGANIC SOLAR CELL AND METHOD FOR MANUFACTURING SAME
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The present specification relates to an organic solar cell and a method for preparing the same. Specifically, an organic solar cell according to the present specification may be prepared by a solution process, and may include a photoactive layer which has a strong binding force due to a hydrogen bond and is excellent in crystallinity. Accordingly, the organic solar cell according to the present specification may exhibit characteristics which are excellent in driving voltage, current, service life, and the like.
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Paragraph 0150; 0151; 0152; 0153
(2016/12/16)
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- NEW COMPOUNDS AND ORGANIC SOLAR CELL COMPRISING THE SAME
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The present invention relates to a novel compound and an organic solar cell wherein the novel compound is allowed to introduce various functional groups and can be used as a material for an optical activating layer of the organic solar cell, and the organic solar cell of the present invention can be manufactured in a solution process and accordingly includes a good crystal optical activating layer with a strong bond, thereby having good properties like driving voltage, current and longevity.COPYRIGHT KIPO 2015
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Paragraph 0150-0153
(2016/12/01)
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