01929nas a2200229 4500008004100000022001400041245009300055210006900148260010600217300001200323490000800335520110400343653000901447653001501456653001701471653000801488100001701496700002401513700002401537700001801561856012001579 2014 eng d a0038-092X00aComparative study on the dye sensitized solar cell performance of solution processed ZnO0 aComparative study on the dye sensitized solar cell performance o aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcAPR a143-1510 v1023 a

We have monitored the performance of the dye-sensitized solar cells (DSSC) using solution processed ZnO having different shapes and aspect ratios. The aspect ratio and surface area of the ZnO structures have been regulated by carefully controlling the precursor concentration and reaction conditions. The shape of the synthesized structures has been varied from larger rods to smaller rods to hexagonal prisms. The synthesized hexagonal prism shaped ZnO with an aspect ratio of around one exhibited the highest surface area of 42 m(2)/g. The ZnO rods with higher aspect ratios of 5 and 16 exhibited lower surface areas of 22 and 2 m(2)/g, respectively. The dye sensitized solar cells constructed using the as-prepared ZnO structures and N719 dye molecules, exhibited efficiencies that varied as a function of surface area of the samples, with ZnO hexagonal prism exhibiting a maximum efficiency of around 1.38 +/- 0.01%. The results indicated a direct correlation between the surface area of the ZnO structures and the energy conversion efficiency. (C) 2014 Elsevier Ltd. All rights reserved.

10aDSSC10aPhotoanode10asurface area10aZnO1 aJana, Arpita1 aDas, Partha, Pratim1 aAgarkar, Shruti, A.1 aDevi, Sujatha uhttps://library.ncl.res.in/content/comparative-study-dye-sensitized-solar-cell-performance-solution-processed-zno-002174nas a2200205 4500008004100000022001400041245014700055210006900202260007100271300001400342490000700356520133100363100002401694700002401718700002601742700002401768700002901792700001801821856012901839 2014 eng d a0020-166900aDefects in chemically synthesized and thermally processed ZnO nanorods: implications for active layer properties in dye-sensitized solar cells0 aDefects in chemically synthesized and thermally processed ZnO na a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcAPR a3961-39720 v533 a

We have carried out the effect of post annealing temperatures on the performance of solution-grown ZnO rods as photoanodes in dye-sensitized solar cells. Keeping our basic objective of exploring the effect of native defects on the performance of DSSC, we have synthesized ZnO rods having length in the range of 2-5 mu m by a modified sonication-induced precipitation technique. We performed extensive characterization on the samples annealed at various temperatures and confirmed that annealing at 300 degrees C results in ZnO rods with minimum native defects that have been identified as doubly ionized oxygen vacancies. The electron paramagnetic resonance measurements on the samples, on the other hand, confirmed the presence of shallow donors in the low temperature annealed samples. We also carried out electrochemical impedance measurements to understand the transport properties at different interfaces in the solar cell assembly. We could conclude that solution-processed ZnO rods annealed at 300 degrees C are better suited for fabricating DSSC with improved efficiency (1.57%), current density (5.11 mA/cm(2)), and fill factor (45.29%). On the basis of our results, we were able to establish a close connection between the defects in the metal oxide electron transporting nano system and the DSSC performance.

1 aDas, Partha, Pratim1 aAgarkar, Shruti, A.1 aMukhopadhyay, Soumita1 aManju, Unnikrishnan1 aOgale, Satishchandra, B.1 aDevi, Sujatha uhttps://library.ncl.res.in/content/defects-chemically-synthesized-and-thermally-processed-zno-nanorods-implications-active-001785nas a2200253 4500008004100000022001400041245008200055210006900137260007300206300001200279490000700291520094300298653000901241653001501250653001301265653002301278653000801301100002401309700002601333700002401359700001701383700001801400856011301418 2015 eng d a1293-255800aPhotochemical performance of ZnO nanostructures in dye sensitized solar cells0 aPhotochemical performance of ZnO nanostructures in dye sensitize aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT a237-2430 v483 a

In this work, the photoconversion efficiencies of ZnO having diverse microstructures and structural defects have been investigated. A conversion efficiency of 138% was achieved for the DSSCs fabricated with as prepared ZnO nanorods having minimum vacancy defects and a favourable one dimensional directional pathway for electron conduction. The DSSCs fabricated with ZnO nanoparticles exhibited relatively low conversion efficiency of 1.004% probably due to multiple trapping/detrapping phenomena within the grain boundaries and ZnO flowers though exhibited a high dye adsorption capability exhibited the lowest conversion efficiency of 0.59% due to a high concentration of structural defects. Based on the experimental evidences, we believe that the type of defects and their concentrations are more important than shape in controlling the overall performance of ZnO based DSSCs. (C) 2015 Elsevier Masson SAS. All rights reserved.

10aDSSC10aEfficiency10aEmission10aStructural defects10aZnO1 aDas, Partha, Pratim1 aMukhopadhyay, Soumita1 aAgarkar, Shruti, A.1 aJana, Arpita1 aDevi, Sujatha uhttps://library.ncl.res.in/content/photochemical-performance-zno-nanostructures-dye-sensitized-solar-cells-0