01665nas a2200217   4500008004100000022001400041245011800055210006900173260011000242300001200352490000700364520079600371100002501167700002101192700001701213700002501230700001801255700002701273700002201300856012501322       2012                        eng d  a0959-942800aTuning spectral properties of phenothiazine based donor-pi-acceptor dyes for efficient dye-sensitized solar cells0 aTuning spectral properties of phenothiazine based donorpiaccepto  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcNOV  a889-8940 v223 a<p>Two novel metal-free organic donor-pi-acceptor dyes were synthesized using electron-rich 10-butyl-(2-methylthio)-10H-phenothiazine as a donor and cyanoacrylic acid as an acceptor. The spectral response of the dye was tuned by introducing a vinylene thiophene pi-bridge. Obtained optical and electrochemical properties of the dyes seemed to be promising in terms of employing them as light harvesters in dye-sensitized solar cells (DSCs). The efficiencies of the devices under standard AM 1.5G (100 mW cm(-2)) conditions reached 7.3% with volatile electrolyte. The differences in the photovoltaic parameters of these DSCs were explained by comparing the results of electrochemical impedance spectroscopy (EIS) measurements and transient photovoltage and photocurrent decay experiments.</p>1 aMarszalek, Magdalena1 aNagane, Satyawan1 aIchake, Amol1 aHumphry-Baker, Robin1 aPaul, Vincent1 aZakeeruddin, Shaik, M.1 aGraetzel, Michael  uhttps://library.ncl.res.in/content/tuning-spectral-properties-phenothiazine-based-donor-pi-acceptor-dyes-efficient-dye-001988nas a2200217   4500008004100000022001400041245011300055210006900168260011000237300001400347490000600361520112000367100002501487700002101512700001701533700002501550700001801575700002701593700002101620856012901641       2013                        eng d  a2046-206900aStructural variations of D-pi-A dyes influence on the photovoltaic performance of dye-sensitized solar cells0 aStructural variations of DpiA dyes influence on the photovoltaic  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAR  a7921-79270 v33 a<p>Two new organic D-pi-A dyes containing identical pi-conjugated spacer and anchoring/acceptor moieties but different donor groups were designed and synthesized. These dyes containing didodecylcyclopentadithiophene (CPDT) as a spacer, cyanoacrylic acid as an acceptor and N-butyl-carbazole or N-butyl-phenothiazine moieties as electron donor groups are labelled as V4 and V11 dyes, respectively. The variation in the donor group of these two dyes, that influences the photophysical, electrochemical and photovoltaic parameters, was investigated. The highest photovoltaic conversion efficiency of 7.5% was obtained with V4 dye at AM 1.5 G full sunlight intensity (100 mWcm(-2)). Comparison of phenothiazine donor dyes with two different pi-conjugated spacers, CPDT (V11) and vinyl thiophene (V7) containing devices shows that the V-oc of V7 dye is lower than that of V11 due to the downward shift of the conduction band edge. Transient photovoltage and electrochemical impedance spectroscopy measurements were performed to explain the differences in the PV parameters by varying the donors and/or spacer groups.</p>1 aMarszalek, Magdalena1 aNagane, Satyawan1 aIchake, Amol1 aHumphry-Baker, Robin1 aPaul, Vincent1 aZakeeruddin, Shaik, M.1 aGratzel, Michael  uhttps://library.ncl.res.in/content/structural-variations-d-pi-dyes-influence-photovoltaic-performance-dye-sensitized-solar-001830nas a2200205   4500008004100000245016600041210007000207260000800277300001200285490000700297520103000304100002101334700001701355700002001372700002201392700002401414700002501438700002801463856013301491       2017                        eng d00aPhenothiazine-based D-A-π-A dyes for highly efficient dye sensitized solar cells: effect of internal acceptor and non-conjugated π-spacer on device performance0 aPhenothiazinebased DAπA dyes for highly efficient dye sensitized  cFEB  a280-2860 v823 aThree new D-A-pi-A metal-free organic dyes based on phenothiazine as a donor (D) and non-conjugated pi-spacer were designed and synthesized. The incorporation of different 'internal acceptors' (electron traps) such as benzothiadiazole (BTD), benzotriazole (BTA), and pyridine were shown to allow systematic tuning of the energy levels and the photophysical properties. The AI-1 dye showed lower electronic disorder compared with the other two dyes. The efficiencies achieved with AI-1, AI-2, and AI-3 dyes were 8.5% (J(sc) = 15.42 mA cm(-2), V-oc = 0.78 V, FF = 68%), 7% (J(sc) = 12.8 mA cm(-2), V-oc = 0.78 V, FF = 68%) and 6.7% (J(sc) = 11.57 mA cm(-2), V-oc = 0.82 V, FF = 68.26 %), respectively. The incorporation of non-conjugated phenothiazine as a p-spacer in D-A-pi-A dyes showed remarkable enhancement in the photovoltaic performance of dye-sensitized solar cell (DSSC) devices. The sealed DSSC devices with iodide/tri-iodide (I-/I-3(-) @)based liquid electrolyte showed promising stability under ambient conditions.1 aNagane, Satyawan1 aIchake, Amol1 aAgrawal, Ishita1 aSadhanala, Aditya1 aFriend, Richard, H.1 aOgale, Satishchandra1 aWadgaonkar, Prakash, P.  uhttps://library.ncl.res.in/content/phenothiazine-based-d-%CF%80-dyes-highly-efficient-dye-sensitized-solar-cells-effect-internal01950nas a2200253   4500008004100000022001400041245010600055210006900161260000800230300002300238490000700261520108800268653001901356653001401375653002801389100002201417700001701439700002201456700001801478700002201496700001901518700002801537856013101565       2018                        eng d  a1022-976000aPhenazine-containing poly(phenylenevinylene): a new polymer with impressive field emission properties0 aPhenazinecontaining polyphenylenevinylene a new polymer with imp  cFEB  aArticle Number: 610 v253 a<p>Phenazine-containing poly(phenylenevinylene) (P(PHN-PV)) was synthesized using Wittig-Horner polycondensation of the appropriately designed monomers viz. 5,10-dioctyl-5,10-dihydrophenazine-2,7-dicarbaldehyde and tetraethyl ((2,5-bis((2-ethylhexyl) oxy)-1,4 phenylene) bis(methylene)) bis(phosphonate). The design embraces the specific motivation of incorporating the nitrogen-containing heterocycle viz. .phenazine in poly(phenylenevinylene) backbone. P(PHN-PV) exhibited reversible redox properties. In the field emission measurements performed on the film of P(F'HN-PV), the turn-on field was observed to be 1.93 V/mu m for the current density of 10 mu A/cm(2). The maximum current density of similar to 4.87 mA/cm(2) was achieved at the applied field of 3.84 V/mu m. The emission current showed impressive stability for 6 h at a constant current of 1 mu A (current density of about 20 mu A/cm(2)). These results emphasize the role of phenazine heterocycle with lone pair of electrons on nitrogen in lowering the oxidation onset and in turn reduction of the turn-on voltage.</p>10afield emission10aPhenazine10aPoly(phenylenevinylene)1 aChhatre, Shraddha1 aIchake, Amol1 aHarpale, Kashmira1 aPatil, Sumati1 aDeshpande, Aparna1 aMore, Mahendra1 aWadgaonkar, Prakash, P.  uhttps://library.ncl.res.in/content/phenazine-containing-polyphenylenevinylene-new-polymer-impressive-field-emission-properties