000185525 001__ 185525
000185525 005__ 20181203023047.0
000185525 0247_ $$2doi$$a10.1039/c2ta00674j
000185525 022__ $$a2050-7488
000185525 02470 $$2ISI$$a000314642700018
000185525 037__ $$aARTICLE
000185525 245__ $$aEffects of ZnO film growth route and nanostructure on electron transport and recombination in dye-sensitized solar cells
000185525 260__ $$aCambridge$$bRoyal Society of Chemistry$$c2013
000185525 269__ $$a2013
000185525 300__ $$a10
000185525 336__ $$aJournal Articles
000185525 520__ $$aThe photovoltaic performances of ZnO-based dye-sensitized solar cells (DSSCs) have been studied for ZnO porous films prepared by different techniques. A comparison is made between nanoparticle (NP) films prepared by a sol-gel method and two different electrodeposited (ED) nanoporous films. The D149 indoline dye/ZnO with ZnO prepared by electrochemistry at rather high overvoltage has been found to be the best system. The cell functioning has been studied in-depth by electrochemical impedance spectroscopy (EIS) measurements made over a large potential range, in the dark and under illumination. It is shown that a much deeper sub-conduction band edge density of states (DOS) exists in the case of NP cells compared to ED cells. The electron dynamics have been analysed by determining the charge carrier lifetimes and transport/collection times. In the case of NP films, the charge carrier behaviour is characterized by rather long lifetimes and transport times with a marked voltage response typical of conduction that is governed by trapping-detrapping events. On the contrary, in the case of electrodeposited films, these two parameters are much shorter and the transport is characterized by a straight charge transport. Using photoluminescence data, the charge carrier lifetimes have been related to the surface defects of the ZnO nanostructures. The deduced electron collections were found to be very efficient with values greater than 90%. We have also determined that the ZnO film conductivities were higher than for anatase TiO2, and that the electron diffusion coefficient was higher in the ED film compared to the NP film.
000185525 700__ $$aMagne, Constance$$uChim Paristech, CNRS, Lab Electrochim Chim Interfaces & Modelisat Energ, UMR 7575, F-75231 Paris 05, France
000185525 700__ $$0244223$$aMoehl, Thomas$$g196687
000185525 700__ $$aUrien, Mathieu$$uSt Gobain Res, F-93303 Aubervilliers, France
000185525 700__ $$0240191$$aGraetzel, Michael$$g105292
000185525 700__ $$aPauporte, Thierry$$uChim Paristech, CNRS, Lab Electrochim Chim Interfaces & Modelisat Energ, UMR 7575, F-75231 Paris 05, France
000185525 773__ $$j1$$k6$$q2079-2088$$tJournal Of Materials Chemistry A
000185525 909C0 $$0252060$$pLPI$$xU10101
000185525 909CO $$ooai:infoscience.tind.io:185525$$pSB$$particle
000185525 917Z8 $$x105528
000185525 937__ $$aEPFL-ARTICLE-185525
000185525 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000185525 980__ $$aARTICLE