02088nas a2200229   4500008004100000022001400041245017400055210006900229260011000298300001600408490000600424520111500430100001601545700002801561700001801589700003001607700002401637700002101661700002301682700002101705856013201726       2015                        eng d  a2046-206900aDetailed study on the thermal, photo-physical and electrochemical properties and OFET applications of D-pi-A-pi-D structured unsymmetrical diketopyrrolopyrrole materials0 aDetailed study on the thermal photophysical and electrochemical   aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcOCT  a94859-948650 v53 a<p>A series of seven unsymmetrical diketopyrrolopyrrole (DPP) derivatives with donor-pi-acceptor-pi-donor (D-pi-A-pi-D) architecture have been designed, synthesized and well characterised. The effect of the electron donating capacity and extent of electronic conjugation of the end-capping units on the thermal, photo-physical and electrochemical properties of the synthesized materials was thoroughly investigated using various experimental techniques and theoretical calculations. Organic field-effect transistors (OFETs) were fabricated using these materials to obtain their hole/electron transporting characteristics. All these materials showed moderate to good hole transporting ability, and the OFET fabricated using the DPP-derivative with benzofuran and pyrene end groups exhibited a hole mobility of 6.7 x 10(-4) cm(2) V-1 s(-1) with VT of similar to 9 V. The observed photo-physical, electrochemical, thermal, and charge carrier properties of the synthesized DPP-derivatives indicated their applicability in various areas like organic photovoltaics, disposable electronics and biomedical devices.</p>1 aBharath, D.1 aChithiravel, Sundaresan1 aSasikumar, M.1 aChereddy, Narendra, Reddy1 aShanigaram, Balaiah1 aBhanuprakash, K.1 aKrishnamoorthy, K.1 aRao, Jayathirtha  uhttps://library.ncl.res.in/content/detailed-study-thermal-photo-physical-and-electrochemical-properties-and-ofet-applications-002039nas a2200181   4500008004100000245012900041210006900170260000800239300001000247490000800257520133100265100002901596700002801625700002001653700002201673700003001695856013201725       2018                        eng d00aDihedral angle control to improve the charge transport properties of conjugated polymers in organic field effect transistors0 aDihedral angle control to improve the charge transport propertie  cMAR  a51-580 v6953 aDiketopyrrolopyrrole (DPP) and i-Indigo (i-Ind) are two monomers that are widely explored as active materials in organic field effect transistor and solar cells. These two molecules showed impressive charge carrier mobility due to better packing that are facilitated by quadrupoles. We hypothesized that the copolymers of these monomers would also exhibit high charge carrier mobility. However, we envisioned that the dihedral angle at the connecting point between the monomers will play a crucial role in packing as well as charge transport. To understand the impact of dihedral angle on charge transport, we synthesized three copolymers, wherein the DPP was sandwiched between benzenes, thiophenes and furans. The copolymer of i-Indigo and furan comprising DPP showed a band gap of 1.4 eV with a very high dihedral angle of 179 degrees. The polymer was found to pack better and the coherence length was found to be 112 angstrom. The hole carrier mobility of these polymer was found to be highest among the synthesized polymer i. e. 0.01 cm(2)/vs. The copolymer comprising benzene did not transport hole and electrons. The dihedral angle at the connecting point between i and Indigo and benzene DPP was 143 angstrom, which the packing and consequently charge transport properties. (C) 2018 Elsevier B. V. All rights reserved.1 aDharmapurikar, Satej, S.1 aChithiravel, Sundaresan1 aMane, Manoj, V.1 aDeshmukh, Gunvant1 aKrishnamoorthy, Kothandam  uhttps://library.ncl.res.in/content/dihedral-angle-control-improve-charge-transport-properties-conjugated-polymers-organic-field