01854nas a2200217 4500008004100000022001400041245007800055210006900133260008300202300001400285490000700299520103900306653003101345653003001376653003701406100002401443700002101467700002001488700002401508856010401532 2011 eng d a1567-173900aGrowth of aligned ZnO nanorods array on ITO for dye sensitized solar cell0 aGrowth of aligned ZnO nanorods array on ITO for dye sensitized s aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbInt Union Mat Res Soc (IUMRS)cJAN aS113-S1160 v113 a

Aligned ZnO films of nanorods arrays were grown on Indium doped Tin oxide (ITO) glass substrate for the Dye Sensitized Solar Cells (DSSCs) applications. Two-step approach was employed for the deposition, which offers advantages such as excellent surface adhesion, large area deposition, high reproducibility and yield. Structural characterization using X-ray diffraction (XRD) shows a preferred c-axis (002) oriented growth. Scanning Electron Microscopy (SEM) images reveals uniformly distributed hexagonal ZnO nanorods with average diameter varying from 80 to 250 nm. Average growth rate of the films was estimated using Surface Profilometer which was found to be similar to 1 mu m/h. Optical characterizations were carried out using Photo-spectrometer and Raman spectroscopy. The DSSCs using these ZnO films of nanorods array as photo-electrodes show conversion efficiency ranging from 0.24 to -0.71 %, the maximum efficiency was obtained for films deposited for time duration 8 h. (C) 2010 Elsevier B.V. All rights reserved.

10aAligned ZnO nanorod growth10aDye sensitized solar cell10aOpen aqueous solution deposition1 aYengantiwar, Ashish1 aSharma, Ramakant1 aGame, Onkar, S.1 aBanpurkar, Arun, G. uhttp://library.ncl.res.in/content/growth-aligned-zno-nanorods-array-ito-dye-sensitized-solar-cell-001935nas a2200193 4500008004100000022001400041245013200055210006900187260011000256300001400366490000600380520111600386100001801502700002001520700002001540700002401560700002901584856012801613 2011 eng d a1754-569200aShape preserving chemical transformation of ZnO mesostructures into anatase TiO2 mesostructures for optoelectronic applications0 aShape preserving chemical transformation of ZnO mesostructures i aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcAUG a2835-28390 v43 a

In this work we report on the synthesis of various ZnO mesostructures (rods, spheres, flakes and flower-like morphologies) by hydrothermal and co-precipitation methods and their remarkable and complete transformation into anatase TiO2 mesostructures with nominally similar shapes using controlled low temperature TiCl4 treatment. Various techniques are used to demonstrate the phase purity and morphology details. Based on the careful examination of the transformation of ZnO rods into TiO2 tubes we suggest a mechanism which embodies initial formation of a thin TiO2 shell on the ZnO surface by ion exchange (Ti4+-Zn2+) followed by Zn diffusion through the shell and its oxidation on the surface. We used these converted TiO2 mesostructures for light harvesting in Dye Sensitized Solar Cells (DSSCs) to enhance the conversion efficiency. It is shown that DSSCs made using a doctor bladed film of TiO2 nanoparticles with an overlayer of TiCl4 treated ZnO flowers yield a solar cell efficiency of 6.9% which is considerably higher than that with only TiO2 nanoparticle film (5.4%) of comparable thickness.

1 aMuduli, Subas1 aGame, Onkar, S.1 aDhas, Vivek, V.1 aYengantiwar, Ashish1 aOgale, Satishchandra, B. uhttp://library.ncl.res.in/content/shape-preserving-chemical-transformation-zno-mesostructures-anatase-tio2-mesostructures-001554nas a2200229 4500008004100000022001400041245007200055210006700127260011000194300001400304490000600318520071600324100002001040700002101060700002001081700002401101700002401125700002001149700002401169700002901193856010201222 2011 eng d a2040-336400aStrong photo-response in a flip-chip nanowire p-Cu2O/n-ZnO junction0 aStrong photoresponse in a flipchip nanowire pCu2OnZnO junction aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcOCT a4706-47120 v33 a

Cu2O nanoneedles are synthesized on a copper substrate by a simple anodization and reducing ambient annealing protocol. ZnO nanorods are grown on ITO coated glass by a low temperature chemical route. The electronic and photo-response properties of the p-Cu2O/n-ZnO flip-chip heterojunction are then studied and analyzed. We show that the I-V characteristic is rectifying and the junction exhibits a good photoresponse (similar to 120% under 1 V reverse bias) under AM 1.5 (1 Sun) illumination. This nano-heterojunction photo-response is far stronger as compared to that of a pulsed laser deposited thin film p-Cu2O/n-ZnO heterojunction, which can be attributed to higher junction area in the former case.

1 aDeo, Meenal, S.1 aMujawar, Sarfraj1 aGame, Onkar, S.1 aYengantiwar, Ashish1 aBanpurkar, Arun, G.1 aKulkarni, Sneha1 aJog, Jyoti, Prakash1 aOgale, Satishchandra, B. uhttp://library.ncl.res.in/content/strong-photo-response-flip-chip-nanowire-p-cu2on-zno-junction-0