01836nas a2200181   4500008004100000022001400041245006900055210006900124260011000193300001400303490000700317520112700324100002601451700002501477700002001502700003001522856010201552       2012                        eng d  a1463-907600aBand edge modulated conjugated polymers for oxidation prevention0 aBand edge modulated conjugated polymers for oxidation prevention  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcFEB  a4577-45830 v143 a<p>The impact of electron transfer (ET) from a series of band edge modulated polymers to atmospheric oxygen is examined in connection with substrate oxidation prevention. Polymers with the highest occupied molecular orbital (HOMO) energy level below and above the oxygen energy level were tested and the former showed better efficiency. Furthermore, the oxidation prevention efficiency of a polymer with lower HOMO increased by two orders of magnitude, when the pores on the film were filled with spherical molecules, [6,6]-phenyl-C61-butyric acid methyl ester. We found that the polymer surface hydrophobicity has little or no influence on oxidation prevention. It is interesting to note that a polymer with a hole mobility of 8 x 10(-10) cm(2) V-1 s(-1) showed a two-fold increase in oxidation prevention efficiency compared to a polymer with a hole mobility of 6 x 10(-5) cm(2) V-1 s(-1). Over all, from the concerted approach, we conclude that a polymer devoid of pores with the HOMO energy level below oxygen and low charge carrier mobility is a suitable candidate for prevention of substrate oxidation/corrosion.</p>1 aMahale, Rajashree, Y.1 aArulkashmir, Arulraj1 aDutta, Kingshuk1 aKrishnamoorthy, Kothandam  uhttps://library.ncl.res.in/content/band-edge-modulated-conjugated-polymers-oxidation-prevention-001905nas a2200169   4500008004100000022001400041245012300055210006900178260007500247300001200322490000600334520118700340100002501527700002401552700003001576856012901606       2016                        eng d  a1614-683200aBand edge modulated polymer layer to decrease back electron transfer and increase efficiency in sensitized solar cells0 aBand edge modulated polymer layer to decrease back electron tran  aPOSTFACH 101161, 69451 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcMAY  a15023340 v63 a<p>Recombination of charges residing in the TiO2 and redox electrolyte is one of the factors affecting the efficiency of dye sensitized solar cells (DSSCs). To circumvent this recombination, inorganic oxide barrier layers and organic silanes have been coated on TiO2/dyes. Due to the insulating nature of these layers, the efficiency increase is not very impressive. Conducting polymers with different band edges are used to suppress the charge recombination. Amongst the four polymers that are used as barrier layers, a polymer with a highest occupied molecular orbital energy at -5.8 eV and lowest unoccupied molecular orbital at -3.1 eV is found to increase the electron life time at TiO2 and decrease the charge recombination. The electron life time is found to be 88 ms. In addition to the long electron life time, the recombination resistance of this polymer is also high (91 Omega). This resistance is 18% higher than that measured for DSSCs without polymer barrier layer. These factors impact the efficiency of DSSCs. DSSCs fabricated with this polymer as barrier layer exhibit an efficiency of 9.2%, which is 22% higher than that of DSSCs without polymer barrier layer.</p>1 aArulkashmir, Arulraj1 aSudhakar, Vediappan1 aKrishnamoorthy, Kothandam  uhttps://library.ncl.res.in/content/band-edge-modulated-polymer-layer-decrease-back-electron-transfer-and-increase-efficiency