00887nas a2200157 4500008004100000022001400041245011600055210006900171260011000240300001400350490000700364520018100371100001900552700003000571856012800601 2014 eng d a1359-734500aDisassembly of micelles in nanoscopic space to prepare concentric nanotubes with variable hydrophobic interiors0 aDisassembly of micelles in nanoscopic space to prepare concentri aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcAPR a5905-59080 v503 a

Nanotubes with variable hydrophobic interiors were prepared by disassembling anionic micelles in the inner walls of positive charge bearing conjugated polymer nanotubes.

1 aDas, Chayanika1 aKrishnamoorthy, Kothandam uhttp://library.ncl.res.in/content/disassembly-micelles-nanoscopic-space-prepare-concentric-nanotubes-variable-hydrophobic-000986nas a2200157 4500008004100000022001400041245010800055210006900163260011000232300001400342490000700356520028600363100002500649700003000674856012400704 2016 eng d a1359-734500aDisassembly of micelles to impart donor and acceptor gradation to enhance organic solar cell efficiency0 aDisassembly of micelles to impart donor and acceptor gradation t aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJAN a3486-34890 v523 a

A transparent, conducting and low surface energy surface was prepared by disassembly of anionic micelles, which altered the orientation of the donor polymer and imparted gradation between the donor and acceptor. This configuration increased the solar cell device efficiency.

1 aArulkashmir, Arulraj1 aKrishnamoorthy, Kothandam uhttp://library.ncl.res.in/content/disassembly-micelles-impart-donor-and-acceptor-gradation-enhance-organic-solar-cell-002038nas a2200181 4500008004100000245012900041210006900170260000800239300001000247490000800257520133100265100002901596700002801625700002001653700002201673700003001695856013101725 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 uhttp://library.ncl.res.in/content/dihedral-angle-control-improve-charge-transport-properties-conjugated-polymers-organic-field02064nas a2200205 4500008004100000022001400041245009100055210006900146260000800215300001200223490000700235520134700242100002401589700002701613700002201640700002601662700003001688700002701718856011301745 2023 eng d a0031-865500aD-A-D-based unsymmetrical thiosquaraine dye for the dye-sensitized solar cells(dagger)0 aDADbased unsymmetrical thiosquaraine dye for the dyesensitized s cMAR a529-5370 v993 a

In dye-sensitized solar cell, modulating the electronic properties of the sensitizer by varying the donor, pi-spacer, acceptor and anchoring groups help optimizing the structure of the dye for better device performance. Here, a donor-acceptor-donor-based unsymmetrical thiosquaraine sensitizer (SQ5S) has been designed and synthesized. Photophysical, electrochemical, theoretical and photovoltaic characterizations of SQ5S dye have been compared with its oxygen analog, SQ5. The incorporation of the sulfur atom in the acceptor unit of SQ5S dye showed an intense peak at 688 nm, which was 38 nm of red-shifted and showed the panchromatic light harvesting response with the onset of 850 nm compared with SQ5 dye. The LUMO and HOMO energy levels are well aligned with the conduction band of TiO2 and the redox potential of electrolyte for the charge injection and the dye-regeneration processes, respectively. Photovoltaic efficiency of 1.51% (V-OC 610 mV, J(SC) 3.07 mA cm(-2), ff 81%) has been achieved for SQ5S dye, whereas SQ5 showed the device performance of 5.43% (V-OC 723 mV, J(SC) 9.3 mA cm(-2), ff 80%). The decreased device performance for the dye SQ5S has been attributed to the favorable intersystem crossing process associated with the photoexcited SQ5S that reduces the driving force for the charge injection process.

1 aJadhav, Avinash, P.1 aSingh, Ambarish, Kumar1 aMaibam, Ashakiran1 aKrishnamurty, Sailaja1 aKrishnamoorthy, Kothandam1 aNithyanandhan, Jayaraj uhttp://library.ncl.res.in/content/d-d-based-unsymmetrical-thiosquaraine-dye-dye-sensitized-solar-cellsdagger