02544nas a2200289   4500008004100000022001400041245014300055210006900198260007100267300001200338490000600350520143900356653002201795653003001817653003001847653002301877653003101900653003101931100002501962700002001987700002802007700001502035700002002050700002902070700002402099856013102123       2016                        eng d  a1944-824400aPt- and TCO-free flexible cathode for DSSC from highly conducting and flexible PEDOT paper prepared via in situ interfacial polymerization0 aPt and TCOfree flexible cathode for DSSC from highly conducting   a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJAN  a553-5620 v83 a<p>Here, we report the preparation of a flexible, free-standing, Pt- and TCO-free counter electrode in dye-sensitized solar cell (DSSC)-derived from polyethylenedioxythiophene (PEDOT)-impregnated cellulose paper. The synthetic strategy of making the thin flexible PEDOT paper is simple and scalable, which can be achieved via in situ polymerization all through a roll coating technique. The very low sheet resistance (4 Omega/square) obtained from a film of 40 mu m thick PEDOT paper (PEDOT-p-5) is found to be superior to the conventional fluorine-doped tin oxide (FTO) substrate. The high conductivity (357 S/cm) displayed by PEDOT-p-5 is observed to be stable under ambient conditions as well as flexible and bending conditions. With all of these features in place, we could develop an efficient Pt- and TCO-free flexible counter electrode from PEDOT-p-5 for DSSC applications. The catalytic activity toward the tri-iodide reduction of the flexible electrode is analyzed by adopting various electrochemical methodologies. PEDOT-p-5 is found to display higher exchange current density (7.12 mA/cm(2)) and low charge transfer resistance (4.6 Omega) compared to the benchmark Pt-coated FTO glass (2.40 mA/cm(2) and 9.4 Omega, respectively). Further, a DSSC fabricated using PEDOT-p-5 as the counter electrode displays a comparable efficiency of 6.1% relative to 6.9% delivered by a system based on Pt/FTO as the counter electrode.</p>10acounter electrode10adye-sensitized solar cell10aflexible and thin devices10aimpedance analysis10ainterfacial polymerization10apolyethylenedioxythiophene1 aAnothumakkool, Bihag1 aAgrawal, Ishita1 aBhange, Siddheshwar, N.1 aSoni, Roby1 aGame, Onkar, S.1 aOgale, Satishchandra, B.1 aKurungot, Sreekumar  uhttps://library.ncl.res.in/content/pt-and-tco-free-flexible-cathode-dssc-highly-conducting-and-flexible-pedot-paper-prepared-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-internal